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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

33

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
/builds/core/2aae14b/js/adthrive.min.js?deployment=2026-0...3600.0 s444.1 KiB
www.encyclopedia.com/sites/default/files/images/hero/enc_hero01_3.png86400.0 s569.9 KiB
ads.adthrive.com/builds/core/2aae14b/vendor/prebid/prebid.min.js86400.0 s191.7 KiB
c.aps.amazon-adsystem.com/apstag.js3600.0 s78.4 KiB
/69e75073-3763-483e-a64c-0d281bfd9225/launchpad-liveramp.js0.0 ms59.1 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s73.5 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js?...3600.0 s73.5 KiB
/rjss/st/2948022/94519404/skeleton.js?bundleId=${BUNDLE_I...86400.0 s82.3 KiB
www.encyclopedia.com/sites/default/files/4/2793250.jpg86400.0 s76.8 KiB
cdn.id5-sync.com/api/1.0/id5PrebidModule.js3600.0 s29.6 KiB
/?width=800&height=450&url=%2F%2Fimages.3lift.com%2F20912...86400.0 s55.9 KiB
/sites/default/files/css/css_k9u1IODySqC3j4I1pBBMqRSLt5ZK...86400.0 s47.0 KiB
www.encyclopedia.com/sites/default/files/0/627218.jpg86400.0 s46.3 KiB
www.encyclopedia.com/sites/default/files/4/2796049.jpg86400.0 s44.2 KiB
www.encyclopedia.com/sites/default/files/6/2801633.jpg86400.0 s43.6 KiB
www.encyclopedia.com/sites/default/files/4/2792955.jpg86400.0 s42.6 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
csync.smartadserver.com/rtb/csync/CookieSync.min.js3600.0 s16.4 KiB
/sites/default/files/js/js_c8LbWbHV1txem3q8oAzuadnL-HiBSh...86400.0 s30.7 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s14.1 KiB
raptive.solutions.cdn.optable.co/public-assets/raptive-sdk.js86400.0 s25.3 KiB
/sites/default/files/images/whouseit/a70c83d26434d18cd908...86400.0 s24.3 KiB
/sites/default/files/css/css_PKoD1c51rXhDWjoL2z3EIsRnpif7...86400.0 s23.6 KiB
www.encyclopedia.com/sites/default/files/16/6202133.jpg86400.0 s23.6 KiB
www.encyclopedia.com/sites/default/files/6/2801644.jpg86400.0 s23.6 KiB
/sites/default/files/images/whouseit/nytimes-logo-png-new...86400.0 s22.5 KiB
www.encyclopedia.com/sites/default/files/images/whouseit/nasa2.png86400.0 s19.7 KiB
eus.rubiconproject.com/usync.js21488.0 s11.7 KiB
csync.smartadserver.com/rtb/csync/TemplatePool.min.js3600.0 s8.6 KiB
/sites/default/files/js/js_7riCSsmZKOyjnTzzQILMa9_W2mWycO...86400.0 s15.0 KiB
www.encyclopedia.com/sites/default/files/11/6046687.jpg86400.0 s14.5 KiB
/sites/default/files/js/js_yLV6HYxC2Rnf9ZekS8oWsZmUNhr7Fk...86400.0 s14.2 KiB
www.encyclopedia.com/themes/custom/trustme/images/header-logo.jpg86400.0 s13.8 KiB
ib.3lift.com/ttj?inv_code=AdThrive_Footer_1_HDX_pbs2s_Mobile&tid=452315900.0 s5.7 KiB
/sites/default/files/js/js_WGXfBW_MzOchPG9FUX5M7UvHZXqRJr...86400.0 s11.3 KiB
pghub.io/js/pandg-sdk.js3600.0 s5.4 KiB
/sites/default/files/js/js_zqxY3WQzYNR0NiKCpM5itT0--wb4Ea...86400.0 s9.6 KiB
/jsconfig/rjss/st/2948022/94519404/skeleton.js?cbName=__I...0.0 ms3.8 KiB
usync.4dex.io/usync.js300.0 s3.5 KiB
sb.scorecardresearch.com/internal-cs/6035453/beacon-and.js86400.0 s7.9 KiB
/dvtp_src.js?ctx=34922342&cmp=DV1475451&sid=triplelift&pl...3600.0 s3.8 KiB
ad.impactify.media/static/ad/user-sync/sync.js0.0 ms3.0 KiB
ced-ns.sascdn.com/diff/js/modules/cmp.js86400.0 s7.4 KiB
ads.pubmatic.com/AdServer/js/userSync.js37709.0 s3.9 KiB
cdn-images.mailchimp.com/embedcode/classic-061523.css0.0 ms1.8 KiB
/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZP...86400.0 s4.5 KiB
www.encyclopedia.com/sites/default/files/images/hero/ColumbiaLogo%402x_1.png86400.0 s4.4 KiB
/?width=333&height=333&alt=tl&url=%2F%2Fimages.3lift.com%...86400.0 s4.2 KiB
/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader...172769.0 s4.2 KiB
www.encyclopedia.com/sites/default/files/images/hero/CengageLogo%402x_2.png86400.0 s2.8 KiB
pagead2.googlesyndication.com/pagead/js/r20260813/r20110914/abg_lite.js1209600.0 s10.5 KiB
ads.adthrive.com/builds/customizations/5dc336ff22eddf534ab4417c.js0.0 ms1.0 KiB
/sites/default/files/css/css_AxrMp2NNpMECnjp7kzTMN0neY6nP...86400.0 s2.5 KiB
www.encyclopedia.com/sites/default/files/images/hero/OxfordLogo%402x_2.png86400.0 s2.5 KiB
ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.css3600.0 s1.0 KiB
/cookie?redirect_url=https%3A%2F%2Fs.seedtag.com%2Fcs%2Fc...0.0 ms521 B
/cookie?redirect_url=https%3A%2F%2Fmeasureadv.com%2FuserB...0.0 ms520 B
/cookie?redirect_url=https%3A%2F%2Fsonic.impactify.media%...0.0 ms520 B
/cookie?redirect_url=https%3A%2F%2Fu-las.4dex.io%2Fsetuid...0.0 ms520 B
/api/cookie?partnerId=smaato-progx&gdpr=&gdpr_consent=&us...0.0 ms499 B
/api/cookie?partnerId=smaato-tb&gdpr=&gdpr_consent=&us_pr...0.0 ms499 B
/api/cookie?partnerId=progx-sonobi&gdpr=&gdpr_consent=&us...0.0 ms499 B
/api/cookie?partnerId=progx-openweb&userId=MYg_0PInCp_ow&...0.0 ms499 B
/api/cookie?partnerId=progx-33across&gdpr=&gdpr_consent=&...0.0 ms499 B
/api/cookie?partnerId=progx-adtarget&gdpr=&gdpr_consent=&...0.0 ms499 B
/api/cookie?partnerId=progx-adagio&userId=12bc947f-c80f-4...0.0 ms499 B
/cookie?redirect_url=https%3A%2F%2Fcs-server-s2s.yellowbl...0.0 ms483 B
/cookie?redirect_url=https%3A%2F%2Fcs-server-s2s.yellowbl...0.0 ms474 B
/getuid?gdpr=0&gdpr_consent=&redirect=https%3A%2F%2Fvisit...0.0 ms452 B
/getuid?source=prebid-server&gdpr=0&gdpr_consent=&us_priv...0.0 ms416 B
/usersync/smart/?cb=https%3A%2F%2Frtb-csync.smartadserver...0.0 ms405 B
/usersync/seedtag?cb=https%3A%2F%2Fs.seedtag.com%2Fcs%2Fc...0.0 ms405 B
/usersync/adyoulike/?cb=https%3A%2F%2Fvisitor.us-west1.gc...0.0 ms405 B
/usersync/smart/?cb=https%3A%2F%2Frtb-csync.smartadserver...0.0 ms405 B
/usersync/adyoulike/?cb=https%3A%2F%2Fcs.openwebmp.com%2F...0.0 ms405 B
/usersync/adyoulike/?cb=https%3A%2F%2Fcs.openwebmp.com%2F...0.0 ms405 B
/usersync/adyoulike/?cb=https%3A%2F%2Fcs.openwebmp.com%2F...0.0 ms405 B
/psync?t=d&e=249&u=&clp=aHR0cHM6Ly9jcG0udmlzdGFyc2FnZW5je...0.0 ms399 B
/psync?t=d&e=249&u=&clp=aHR0cHM6Ly9tZWFzdXJlYWR2LmNvbS91c...0.0 ms399 B
/psync?t=d&e=249&u=&clp=aHR0cHM6Ly9jcy5vcGVud2VibXAuY29tL...0.0 ms399 B
/psync?t=d&e=249&u=&clp=aHR0cHM6Ly9jcy5vcGVud2VibXAuY29tL...0.0 ms399 B
match.deepintent.com/usersync/1540.0 ms364 B
cs.yellowblue.io/cs?aid=11587&uid=aa1d7633-0fc0-4793-8f01-c3a3a9e5d43e&gdpr=00.0 ms311 B
/cksync.php?cs=61&type=bts&gdpr=0&gdpr_consent=&redirect=...0.0 ms297 B
/cksync.php?cs=109&type=bts&gdpr=0&gdpr_consent=&us_priva...0.0 ms292 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms288 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms288 B
/visitor/sync?uid=f04f5c55f88ffea7a3ce5b2d908a6e71&visito...0.0 ms288 B
/visitor/sync?uid=9276a8c8d010b77af50144c60047b781&visito...0.0 ms288 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms288 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms288 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms288 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms288 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms288 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms288 B
match.deepintent.com/usersync/158?gdpr=0&gdpr_consent=0.0 ms269 B
/track/cmb/generic?ttd_pid=agyie4r&ttd_tpi=1&gdpr=0&gdpr_...0.0 ms255 B
/track/cmb/generic?ttd_pid=tapad&ttd_tpi=1&ttd_puid=2d607...0.0 ms255 B
/track/cmb/generic?ttd_pid=5jrh0rv&ttd_tpi=1&gdpr=0&gdpr_...0.0 ms254 B
/track/cmb/generic?coppa=&gdpr=0&gdpr_consent=&gpp=&gpp_s...0.0 ms254 B
syncingbridge.com/userBack?uid=OPTOUT&p=60.0 ms232 B
/userBackIframe?uid=213951400623607&gdpr={GDPR}&gdpr_cons...0.0 ms232 B
syncingbridge.com/userBack?uid=MSXHW3OL-1W-KTGN&p=11&gdpr=00.0 ms232 B
/cookiesyncendpoint?biddername=142&key=30d5c879-ef6f-4379...0.0 ms230 B
/cookiesyncendpoint?biddername=142&key=aff058b5-c36d-4c61...0.0 ms230 B
/userBackIframe?uid=4455174417461316386&gdpr=%7BGDPR%7D&g...0.0 ms229 B
measureadv.com/userBackIframe?uid=&gdpr={GDPR}&gdpr_consent={GDPR_CONSENT}&p=90.0 ms229 B
measureadv.com/userBack?uid=OPTOUT&p=100.0 ms229 B
/cookiesyncendpoint?biddername=142&key=1be8c55c-8010-42c5...0.0 ms229 B
/cookiesyncendpoint?auid=&biddername=24&pid=62f53b2c7850d...0.0 ms213 B
/pixel/cookiesyncredir?rurl=https%3A%2F%2Fsync.aniview.co...0.0 ms203 B
/ul_cb/server_match?partner_id=1805&gdpr=0&gdpr_consent=&...0.0 ms198 B
/ul_cb/server_match?partner_id=1790&r=https%3A%2F%2Fu-las...0.0 ms198 B
/cksync?cs=146&gdpr=0&gdpr_consent=&type=vid&redirect=htt...0.0 ms166 B
sync.aniview.com/cookiesyncendpoint?auid=&biddername=18&key=0.0 ms154 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms151 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms150 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms150 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms150 B
/visitor/sync?gdpr=0&gdpr_consent=&is_cookie_sync_uid=1&n...0.0 ms150 B
cs.openwebmp.com/cs?fwrd=1&aid=40043&id=2134365578125610.0 ms135 B
/pixel/cookiesyncredir?rurl=https://x.bidswitch.net/sync?...0.0 ms126 B
creativecdn.com/cm-notify?pi=ogury&gdpr=0&gdpr_consent=&tc=10.0 ms124 B
creativecdn.com/cm-notify?pi=seedtag&tc=10.0 ms124 B
creativecdn.com/cm-notify?gdpr=0&gdpr_consent=&pi=adyoulike&tc=10.0 ms124 B
creativecdn.com/cm-notify?pi=rise&tc=10.0 ms124 B
creativecdn.com/cm-notify?pi=rise&tc=10.0 ms124 B
creativecdn.com/cm-notify?pi=adyoulike&tc=10.0 ms124 B
creativecdn.com/cm-notify?pi=adyoulike&tc=10.0 ms124 B
creativecdn.com/cm-notify?pi=adyoulike&tc=10.0 ms124 B
/redir?issi=1&partnerid=173&partneruserid=&redirurl=https...0.0 ms113 B
/redir/?partnerid=76&partneruserid=&gdpr=0&gdpr_consent=&...0.0 ms113 B
/visitor/bsync?gdpr=%5BGDPR%5D&gdpr_consent=%5BUSER_CONSE...0.0 ms107 B
/visitor/bsync?gdpr=%5BGDPR%5D&gdpr_consent=%5BUSER_CONSE...0.0 ms106 B
/visitor/bsync?gdpr=%5BGDPR%5D&gdpr_consent=%5BUSER_CONSE...0.0 ms106 B
/signal/v1/page_view?data_source_key=Gg1Si3AkcN&ip=92.38....0.0 ms94 B
/pixel/cookiesyncredir?rurl=https://x.bidswitch.net/sync?...0.0 ms86 B
ib.3lift.com/static/buttons/edaa/OBA_UK.webp604800.0 s743 B
ib.3lift.com/static/buttons/edaa/OBA_TRANS.webp604800.0 s641 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11563&uid=&gdpr=00.0 ms63 B
cs.openwebmp.com/cs?fwrd=1&aid=40021&id=0.0 ms63 B
cs.openwebmp.com/cs?aid=40024&id=hvJ0lDQJ42X1ekCW-cV6CDBzjQ5FbFwQE2EvjSfNLvI0.0 ms63 B
/cksync.php?cs=61&type=bts&gdpr=0&gdpr_consent=&redirect=...0.0 ms58 B
/cksync.php?cs=103&type=ste&gdpr=0&gdpr_consent=&gpp_sid=...0.0 ms58 B
/api/sync?callerId=5&gdpr=1&gdpr_consent=&us_privacy=&red...0.0 ms45 B
/cs?fwrd=1&aid=11584&uid=wmMO8777S47lkQ__vXlz&gdpr=0&gdpr...0.0 ms45 B
/cs?fwrd=1&aid=115667&uid=336990f6-533d-4480-aa13-0baba37...0.0 ms45 B
cs.openwebmp.com/cs?fwrd=1&aid=40025&id=00.0 ms45 B
cs.openwebmp.com/cs?fwrd=1&aid=40043&id=2139521007194210.0 ms45 B
/getuid?gdpr_consent=&us_privacy=1YNY&nwid=3050&url=https...0.0 ms44 B
/AdServer/ImgSync?p=159706&gdpr=1&gdpr_consent=&us_privac...0.0 ms40 B
/sync?redirect=https%3A%2F%2Fads.servenobid.com%2Fsync%3F...0.0 ms40 B
/cs?fwrd=1&aid=11581&uid=xxGRDxsIRv1JqA6hOae0HoGDD0RwVby_...0.0 ms40 B
/cs?fwrd=1&aid=11623&rid=CA9_0PUckp_s&id=01a010b8-f9cd-75...0.0 ms39 B
/signal/v1/page_view?data_source_key=Gg1Si3AkcN&ip=92.38....0.0 ms38 B
/signal/v1/page_view?data_source_key=Gg1Si3AkcN&ip=92.38....0.0 ms38 B
/signal/v1/page_view?data_source_key=Gg1Si3AkcN&ip=92.38....0.0 ms38 B
/signal/v1/page_view?data_source_key=Gg1Si3AkcN&ip=92.38....0.0 ms38 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11563&uid=&gdpr=00.0 ms23 B
cs.openwebmp.com/cs?fwrd=1&aid=40021&id=0.0 ms23 B
cs.openwebmp.com/cs?fwrd=1&aid=40021&id=0.0 ms23 B
/cs?fwrd=1&aid=11592&uid=part_acNdPQ8vkYvg&ev=1&us_privac...0.0 ms22 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11585&id=4299885552285961000V100.0 ms22 B
cs.yellowblue.io/cs?aid=11599&id=OPTOUT0.0 ms22 B
/cs?fwrd=1&aid=11625&id=6aa716e6-a57f-4344-b7cf-6921192ca...0.0 ms22 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11580&puid=2139522541849760.0 ms22 B
/cs?fwrd=1&fwrd=1&aid=11609&id=2dec371872f88d9d68fdd2d7e4...0.0 ms22 B
cs.yellowblue.io/cs?aid=11587&uid=61340751-f60d-4fad-aa47-847c069c17cb&gdpr=00.0 ms22 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11600&uid=71058399154164560250.0 ms22 B
/cs?fwrd=1&aid=11559&id=52b14077-ec92-4b89-86b9-a2cc1c26df510.0 ms22 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11574&id=76ae88d7410.0 ms22 B
/cs?fwrd=1&aid=115667&uid=5366cc7c-2f29-4ef4-941b-2db28ad...0.0 ms22 B
/cs?fwrd=1&aid=11571&id=16d1dd29-7b13-4420-88fc-f1cfb6ecc...0.0 ms22 B
cs.yellowblue.io/cs?aid=11599&id=OPTOUT0.0 ms22 B
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/cs?fwrd=1&aid=11584&uid=wmMO8777S47TWLWOb6Mw&gdpr=0&gdpr...0.0 ms22 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11585&id=4299885553351778000V100.0 ms22 B
/cs?fwrd=1&aid=11625&id=a6791759-4ed1-4b7c-aded-9e6a4d0f4...0.0 ms22 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11600&uid=33619716886212474830.0 ms22 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11574&id=cd154542e20.0 ms22 B
cs-server-s2s.yellowblue.io/cs?fwrd=1&aid=11580&puid=2134694651485240.0 ms22 B
/cs?fwrd=1&aid=11559&id=c34695b2-903e-49e6-a8d5-c881e04d5d900.0 ms22 B
/cs?fwrd=1&aid=40039&uid=wmMO8777S472sHS0V1uS&gdpr=[GDPR]...0.0 ms22 B
/cs?aid=40029&id=6361632712787266437&gdpr=0&gdpr_consent=...0.0 ms22 B
cs.openwebmp.com/cs?fwrd=1&aid=40017&id=OPTOUT0.0 ms22 B
cs.openwebmp.com/cs?fwrd=1&aid=40040&puid=06472f0e-5a6b-4495-9298-badbc1b8a15c0.0 ms22 B
/cs?fwrd=1&aid=11623&rid=ker_jgIckj_s&id=01a010b8-f9cd-75...0.0 ms22 B
/cs?fwrd=1&aid=11581&uid=RLJXVynqI7J08F_62ROD61hWWouMrMgK...0.0 ms22 B
cs.openwebmp.com/cs?fwrd=1&aid=40025&id=00.0 ms22 B
/cs?aid=40029&id=8622320909751978887&gdpr=0&gdpr_consent=...0.0 ms22 B
/cs?fwrd=1&aid=40039&uid=wmMO8777S476n1p_kzoN&gdpr=[GDPR]...0.0 ms22 B
cs.openwebmp.com/cs?fwrd=1&aid=40040&puid=27977a0e-287d-49b1-953a-6eefe8bd23250.0 ms22 B
cs.openwebmp.com/cs?fwrd=1&aid=40017&id=OPTOUT0.0 ms22 B
cs.openwebmp.com/cs?fwrd=1&aid=40025&id=00.0 ms22 B
cs.openwebmp.com/cs?fwrd=1&aid=40040&puid=eb9d1885-dcad-4353-8025-0dc487dbd6e50.0 ms22 B
cs.openwebmp.com/cs?fwrd=1&aid=40017&id=OPTOUT0.0 ms22 B
/cs?fwrd=1&aid=40039&uid=wmMO8777S47DyCjVzCRI&gdpr=[GDPR]...0.0 ms22 B
/cs?aid=40029&id=7075207293833350115&gdpr=0&gdpr_consent=...0.0 ms22 B
cs.openwebmp.com/cs?aid=40024&id=_SG4C4NxQhsQNkgtmpp7tjOj4U9p2tjy5FK6bF6Tn2Y0.0 ms22 B
/sync?redirect=https%3A%2F%2Fcs-server-s2s.yellowblue.io%...0.0 ms17 B
/sync?redirect=https%3A%2F%2Fcs-server-s2s.yellowblue.io%...0.0 ms17 B
/sync?redirect=https%3A%2F%2Fcs.openwebmp.com%2Fcs%3Ffwrd...0.0 ms17 B
/sync?redirect=https%3A%2F%2Fcs.openwebmp.com%2Fcs%3Ffwrd...0.0 ms17 B
/sync?redirect=https%3A%2F%2Fcs.openwebmp.com%2Fcs%3Ffwrd...0.0 ms17 B
s.seedtag.com/cs/cookiesync/opera?channeluid=OPUfb9b2884b84343b8972bc545d05d606f0.0 ms16 B
/cs/cookiesync/onetag?a=3&channeluid=Btb8lBrsH639ihT-ehIe...0.0 ms16 B
s.seedtag.com/cs/st/s?source=PrebidServer0.0 ms14 B
s.seedtag.com/cs/cookiesync/sovrn?channeluid=0.0 ms13 B
/?width=800&height=450&url=%2F%2Fimages.3lift.com%2F20912...86400.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
eus.rubiconproject.com/usync.js21488.0 s0 B
ib.3lift.com/static/buttons/edaa/OBA_UK.webp604800.0 s0 B
ib.3lift.com/static/buttons/edaa/OBA_TRANS.webp604800.0 s0 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:1.069 source:map[column:9349 line:1 type:source-location url:https://www.encyclopedia.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:0.578 source:map[column:23006 line:573 type:source-location url:https://ads.adthrive.com/builds/core/2aae14b/js/adthrive.min.js?deployment=2026-08-17-04:rfmc-7:2aae14b:4&bucket=flex-46&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,cfbd,consentManagerCMP,cv2,dlc,es2021,euUsCmp,hb_crid,i262,internalScriptLogError,ld,marmaladeV2,nvc,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rrassf,sbp,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=5dc336ff22eddf534ab4417c urlProvider:network]] map[reflowTime:0.196 source:map[column:121825 line:797 type:source-location url:https://ads.adthrive.com/builds/core/2aae14b/js/adthrive.min.js?deployment=2026-08-17-04:rfmc-7:2aae14b:4&bucket=flex-46&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,cfbd,consentManagerCMP,cv2,dlc,es2021,euUsCmp,hb_crid,i262,internalScriptLogError,ld,marmaladeV2,nvc,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rrassf,sbp,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=5dc336ff22eddf534ab4417c urlProvider:network]] map[reflowTime:2.355 source:map[type:text value:[unattributed]]] map[reflowTime:20.351 source:map[column:13 line:8 type:source-location url: urlProvider:network]] map[reflowTime:0.201 source:map[column:55 line:847 type:source-location url:https://www.googletagmanager.com/gtag/js?id=G-VTWQL8EHT3&cx=c&gtm=4e68d0 urlProvider:network]] map[reflowTime:0.941 source:map[column:38882 line:1 type:source-location url:https://ib.3lift.com/blob/0050d4a22bdd8a04b08ccef0b1874b7f6dbab5c5/dist/bundle.js urlProvider:network]] map[reflowTime:2.165 source:map[column:151370 line:1 type:source-location url:https://ib.3lift.com/blob/0050d4a22bdd8a04b08ccef0b1874b7f6dbab5c5/dist/bundle.js urlProvider:network]] map[reflowTime:0.093 source:map[column:185681 line:1 type:source-location url:https://ib.3lift.com/blob/0050d4a22bdd8a04b08ccef0b1874b7f6dbab5c5/dist/bundle.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
THE WORLD’S #1 ONLINE ENCYCLOPEDIA Search over 200 individual encyclopedias an… div#wrapper > div.dialog-off-canvas-main-canvas > div.homepage > div#block-heroblock
www.encyclopedia.com/sites/default/files/images/hero/enc_hero01_3.png569.2 KiB411.1 KiB
Nintendo div.AdThrive_Footer_1_HDX_pbs2s_Mobile_container > div.AdThrive_Footer_1_HDX_pbs2s_Mobile_media_container > a.AdThrive_Footer_1_HDX_pbs2s_Mobile_media_link > img.AdThrive_Footer_1_HDX_pbs2s_Mobile_media
/?width=800&height=450&url=%2F%2Fimages.3lift.com%2F20912...55.5 KiB53.5 KiB
Pandemic Flu div.whoslooking-slider > div.whoslooking-item > div > img
/sites/default/files/images/whouseit/a70c83d26434d18cd908...23.8 KiB21.1 KiB
The Anglerfish div.whoslooking-slider > div.whoslooking-item > div > img
/sites/default/files/images/whouseit/nytimes-logo-png-new...21.9 KiB19.0 KiB
Explorers, Travelers, and Conquerors: Biographies Hernan Cortes Hernán Cortés … div.popular-topics-container > div.ency-topics > a > div.ency-topic-bkg
www.encyclopedia.com/sites/default/files/4/2796049.jpg43.7 KiB16.3 KiB
Bacteriophages div.whoslooking-slider > div.whoslooking-item > div > img
www.encyclopedia.com/sites/default/files/images/whouseit/nasa2.png19.2 KiB16.2 KiB
U.S. History Boston Tea Party Boston Tea Party 1773. div.popular-topics-container > div.ency-topics > a > div.ency-topic-bkg
www.encyclopedia.com/sites/default/files/4/2793250.jpg76.3 KiB11.2 KiB
Buddhism Pure Land Buddhism Pure Land Buddhism or Amidism, devotional sect of … div.popular-topics-container > div.ency-topics > a > div.ency-topic-bkg
www.encyclopedia.com/sites/default/files/6/2801633.jpg43.1 KiB7.9 KiB
Taxation Income Tax income tax assessment levied upon individual or corporate … div.popular-topics-container > div.ency-topics > a > div.ency-topic-bkg
www.encyclopedia.com/sites/default/files/0/627218.jpg45.7 KiB6.9 KiB
Pathology Autism autism , developmental disability resulting from a neurologic… div.popular-topics-container > div.ency-topics > a > div.ency-topic-bkg
www.encyclopedia.com/sites/default/files/4/2792955.jpg42.0 KiB4.8 KiB
view Music: Popular and Jazz: Biographies Fabian div.homepage > div#block-picksoftheweek > div.clear-both > div.pick-of-week-item
www.encyclopedia.com/sites/default/files/16/6202133.jpg23.1 KiB4.6 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-DIV
nodeLabel: THE WORLD’S #1 ONLINE ENCYCLOPEDIA Search over 200 individual encyclopedias an…
path: 1,HTML,1,BODY,4,DIV,1,DIV,0,DIV,0,DIV
selector: div#wrapper > div.dialog-off-canvas-main-canvas > div.homepage > div#block-heroblock
snippet: <div style="background-image: url('/sites/default/files/images/hero/enc_hero01_3.png');" id="block-heroblock" class="ency-loaded">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
/sites/default/files/css/css_k9u1IODySqC3j4I1pBBMqRSLt5ZK...47.0 KiB776 ms
/sites/default/files/css/css_PKoD1c51rXhDWjoL2z3EIsRnpif7...23.6 KiB625 ms
/sites/default/files/css/css_AxrMp2NNpMECnjp7kzTMN0neY6nP...2.5 KiB173 ms

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 795 ms
URLTime Spent
encyclopedia.com/795 ms
www.encyclopedia.com/0.0 ms

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 300 ms 72.0 KiB
URLTransfer SizeEst Savings
/sites/default/files/css/css_k9u1IODySqC3j4I1pBBMqRSLt5ZK...46.5 KiB39.2 KiB
/sites/default/files/css/css_PKoD1c51rXhDWjoL2z3EIsRnpif7...23.1 KiB22.6 KiB
.adthrive-act25-overlay{z-index:2147483646;background:#0006;width:100%;height:100%;display:none; … } …10.6 KiB10.2 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 450 ms 837.5 KiB
URLTransfer SizeEst Savings
/builds/core/2aae14b/js/adthrive.min.js?deployment=2026-0...443.8 KiB178.6 KiB
/pagead/managed/js/gpt/m202608070101/pubads_impl.js200.8 KiB92.9 KiB
s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js139.9 KiB90.1 KiB
ads.adthrive.com/builds/core/2aae14b/vendor/prebid/prebid.min.js191.3 KiB70.4 KiB
www.googletagmanager.com/gtag/js?id=G-VTWQL8EHT3&cx=c&gtm=4e68d0163.0 KiB66.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-W4GBLXB118.6 KiB62.9 KiB
c.aps.amazon-adsystem.com/apstag.js77.8 KiB56.1 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js?...73.4 KiB55.2 KiB
cdn.doubleverify.com/dv-measurements10323.js94.9 KiB37.9 KiB
ib.3lift.com/blob/0050d4a22bdd8a04b08ccef0b1874b7f6dbab5c5/dist/bundle.js68.4 KiB37.5 KiB
/rjss/st/2948022/94519404/skeleton.js?bundleId=${BUNDLE_I...82.0 KiB36.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.4 KiB30.5 KiB
/ats-modules/dd5bd9b7-a435-4c50-91c3-9c789de1bb35/ats.js38.7 KiB22.3 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
Unattributable4.1 s684 ms0.0 ms
ads.adthrive.com/builds/core/2aae14b/vendor/prebid/prebid.min.js3.3 s2.8 s66 ms
/jsconfig/rjss/st/2948022/94519404/skeleton.js?cbName=__I...1.9 s1.9 s1.0 ms
/builds/core/2aae14b/js/adthrive.min.js?deployment=2026-0...1.9 s1.5 s189 ms
ib.3lift.com/blob/0050d4a22bdd8a04b08ccef0b1874b7f6dbab5c5/dist/bundle.js1.6 s1.3 s114 ms
/pagead/managed/js/gpt/m202608070101/pubads_impl.js1.6 s1.4 s133 ms
/pagead/managed/js/activeview/current/ufs_web_display.js1.6 s1.4 s94 ms
/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader...1.2 s812 ms3.8 ms
cdn.doubleverify.com/dv-measurements10323.js1.1 s979 ms98 ms
www.encyclopedia.com/945 ms32 ms6.8 ms
pagead2.googlesyndication.com/pagead/js/dv3.js689 ms618 ms54 ms
ib.3lift.com/blob/0050d4a22bdd8a04b08ccef0b1874b7f6dbab5c5/dist/302.js606 ms549 ms39 ms
static.adsafeprotected.com/sca.17.6.4.js552 ms514 ms22 ms
/rjss/st/2948022/94519404/skeleton.js?bundleId=${BUNDLE_I...506 ms364 ms124 ms
www.googletagmanager.com/gtag/js?id=G-VTWQL8EHT3&cx=c&gtm=4e68d0464 ms396 ms64 ms
/pagead/managed/js/activeview/current/ufs_web_display.js?...312 ms214 ms95 ms
c.aps.amazon-adsystem.com/apstag.js287 ms205 ms74 ms
www.googletagmanager.com/gtm.js?id=GTM-W4GBLXB253 ms189 ms59 ms
ep2.adtrafficquality.google/sodar/sodar2.js218 ms190 ms6.7 ms
/sites/5dc336ff22eddf534ab4417c/ads.min.js?referrer=https...216 ms163 ms11 ms
cdn.id5-sync.com/api/1.0/id5PrebidModule.js203 ms178 ms10 ms
securepubads.g.doubleclick.net/tag/js/gpt.js191 ms161 ms29 ms
/dvtp_src.js?ctx=34922342&cmp=DV1475451&sid=triplelift&pl...157 ms148 ms3.8 ms
ib.3lift.com/ttj?inv_code=AdThrive_Footer_1_HDX_pbs2s_Mobile&tid=452315150 ms88 ms61 ms
pghub.io/js/pandg-sdk.js136 ms123 ms11 ms
/dbm/ad?dbm_c=AKAmf-AKbXopkWkkjNQnV8XY7kLJG0wdSfEjE_ZPilF...123 ms29 ms48 ms
/69e75073-3763-483e-a64c-0d281bfd9225/launchpad-liveramp.js115 ms65 ms48 ms
www.google-analytics.com/analytics.js107 ms96 ms5.1 ms
raptive.solutions.cdn.optable.co/public-assets/raptive-sdk.js107 ms92 ms8.5 ms
/visit.js?flvr=0&ttmms=313&ttfrms=74&brid=3&brver=146.0.0...100 ms97 ms0.5 ms
ep2.adtrafficquality.google/sodar/VFc2VJAc.js99 ms81 ms17 ms
launchpad.privacymanager.io/latest/launchpad.bundle.js95 ms64 ms29 ms
s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js92 ms68 ms18 ms
/ats-modules/dd5bd9b7-a435-4c50-91c3-9c789de1bb35/ats.js83 ms62 ms20 ms
sb.scorecardresearch.com/cs/6035453/beacon.js73 ms63 ms2.1 ms
pagead2.googlesyndication.com/pagead/js/r20260813/r20110914/abg_lite.js72 ms61 ms8.4 ms
/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZP...51 ms12 ms1.3 ms
/sites/default/files/js/js_c8LbWbHV1txem3q8oAzuadnL-HiBSh...50 ms38 ms9.1 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation17.7 s
Other4.8 s
Script Parsing & Compilation1.6 s
Style & Layout588 ms
Garbage Collection367 ms
Parse HTML & CSS293 ms
Rendering185 ms

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 12.7 KiB
URLTransfer SizeEst Savings
launchpad.privacymanager.io/latest/launchpad.bundle.js40.3 KiB12.7 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
www.encyclopedia.com/sites/default/files/images/hero/enc_hero01_3.png569.9 KiB
/builds/core/2aae14b/js/adthrive.min.js?deployment=2026-0...444.1 KiB
/pagead/managed/js/gpt/m202608070101/pubads_impl.js200.8 KiB
ads.adthrive.com/builds/core/2aae14b/vendor/prebid/prebid.min.js191.7 KiB
www.googletagmanager.com/gtag/js?id=G-VTWQL8EHT3&cx=c&gtm=4e68d0163.0 KiB
s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js140.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-W4GBLXB119.0 KiB
cdn.doubleverify.com/dv-measurements10323.js95.3 KiB
/rjss/st/2948022/94519404/skeleton.js?bundleId=${BUNDLE_I...82.3 KiB
c.aps.amazon-adsystem.com/apstag.js78.4 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Bacteriophages div.whoslooking-slider > div.whoslooking-item > div > img
www.encyclopedia.com/sites/default/files/images/whouseit/nasa2.png
The Anglerfish div.whoslooking-slider > div.whoslooking-item > div > img
/sites/default/files/images/whouseit/nytimes-logo-png-new...
Pandemic Flu div.whoslooking-slider > div.whoslooking-item > div > img
/sites/default/files/images/whouseit/a70c83d26434d18cd908...
div#block-heroblock > div.clear-both > div.list-img > img div#block-heroblock > div.clear-both > div.list-img > img
www.encyclopedia.com/sites/default/files/images/hero/OxfordLogo%402x_2.png
div#block-heroblock > div.clear-both > div.list-img > img div#block-heroblock > div.clear-both > div.list-img > img
www.encyclopedia.com/sites/default/files/images/hero/ColumbiaLogo%402x_1.png
div#block-heroblock > div.clear-both > div.list-img > img div#block-heroblock > div.clear-both > div.list-img > img
www.encyclopedia.com/sites/default/files/images/hero/CengageLogo%402x_2.png
div#tltpvid_21855 > div.tl-transparent > div.tl-adchoices > img.tl-edaa-icon div#tltpvid_21855 > div.tl-transparent > div.tl-adchoices > img.tl-edaa-icon
ib.3lift.com/static/buttons/edaa/OBA_TRANS.webp

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits
●Optimize DOM size
●Font display
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●User Timing marks and measures 10 user timings
●Avoid long main-thread tasks 20 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 930 ms
●Server Backend Latencies 1,160 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 40 ms
●Avoid large layout shifts 3 layout shifts found
○INP breakdown
○Avoid non-composited animations
82

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.ency-hero-search > form > div#edit-actions > input#edit-submit div.ency-hero-search > form > div#edit-actions > input#edit-submit
Recently researched about div.clear-both > div.whoslooking-slider > div.whoslooking-item > span
Recently researched about div.clear-both > div.whoslooking-slider > div.whoslooking-item > span
Recently researched about div.clear-both > div.whoslooking-slider > div.whoslooking-item > span
SUBSCRIBE TO OUR NEWSLETTER div#block-mailchimp > div > div#mc_embed_signup > h2
Sign up with your email address to receive news and updates. div#block-mailchimp > div > div#mc_embed_signup > p.secondary-text
We respect your privacy. div#block-mailchimp > div > div#mc_embed_signup > p.privacy-text
HOME nav#block-trustme-footer > ul > li > a.is-active
ABOUT US nav#block-trustme-footer > ul > li > a
HELP nav#block-trustme-footer > ul > li > a
SITE FEEDBACK nav#block-trustme-footer > ul > li > a
PRIVACY & COOKIE POLICY nav#block-trustme-footer > ul > li > a
TERMS AND CONDITIONS nav#block-trustme-footer > ul > li > a
DAILY nav#block-trustme-footer > ul > li > a
© 2019 Encyclopedia.com | All rights reserved. div#block-trustme-copyright > div > p > span
Information from your device can be used to personalize your ad experience. Do… body.path-frontpage > div.adthrive-comscore > div#adthrive-ccpa-link
A RAPTIVE PARTNER SITE body.path-frontpage > div.adthrive-comscore > span

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#tltpvid_21855 > div.tl-transparent > div.tl-adchoices > img.tl-edaa-icon div#tltpvid_21855 > div.tl-transparent > div.tl-adchoices > img.tl-edaa-icon

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta head > meta

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Sponsored By Nintendo div.AdThrive_Footer_1_HDX_pbs2s_Mobile_textcontent > div.AdThrive_Footer_1_HDX_pbs2s_Mobile_textcontent_creative_copy > div.AdThrive_Footer_1_HDX_pbs2s_Mobile_sponsor > a.AdThrive_Footer_1_HDX_pbs2s_Mobile_sponsor_link

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.js html.js

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Input buttons have discernible text.
●Form elements have associated labels
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Heading elements appear in a sequentially-descending order
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
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Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
Nintendo div.AdThrive_Footer_1_HDX_pbs2s_Mobile_container > div.AdThrive_Footer_1_HDX_pbs2s_Mobile_media_container > a.AdThrive_Footer_1_HDX_pbs2s_Mobile_media_link > img.AdThrive_Footer_1_HDX_pbs2s_Mobile_media
/?width=800&height=450&url=%2F%2Fimages.3lift.com%2F20912...133 x 100 (1.33)800 x 450 (1.78)

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
Topics
ads.adthrive.com/builds/core/2aae14b/vendor/prebid/prebid.min.js line 77, col 266920
SharedStorage
/pagead/managed/js/activeview/current/ufs_web_display.js line 254, col 234
●Uses HTTPS
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
77

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destinationLink Text
www.encyclopedia.com/aboutRead more
/ddm/trackclk/N1072492.5743430KSO-DV360/B35866522.4485012...LEARN MORE

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#tltpvid_21855 > div.tl-transparent > div.tl-adchoices > img.tl-edaa-icon div#tltpvid_21855 > div.tl-transparent > div.tl-adchoices > img.tl-edaa-icon

Canonical links suggest which URL to show in search results. Learn more about canonical links.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links are crawlable
●robots.txt is valid
●Document has a valid `hreflang`

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