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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
48
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.04 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

14.18 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

861 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.051

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

5.84 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

16.23 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.6 MB transferred, 65 requests
FIX
2.6 MB transferred, 65 requests
Warning::
Page weighs 6.4 MB (2.6 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
65 HTTP requests
Info::
Estimated 0.54 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
65 requests
0.54 g CO2 per page load
JavaScript 1.5 MiB 58%
Images 977.7 KiB 37%
CSS 75.5 KiB 3%
Other 24.1 KiB 1%
Other 21.9 KiB 1%
HTML 10.8 KiB 0%
Other 4.2 KiB 0%
Other 562 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3201ms total JS execution
FIX
3201ms total JS execution
Warning::
https://ads.adthrive.com/builds/core/08b4265/es201...: 630ms CPU time
Warning::
Unattributable: 605ms CPU time
Warning::
https://www.encyclopedia.com/: 400ms CPU time
Warning::
https://cdn.consentmanager.net/delivery/customdata...: 355ms CPU time
Info::
https://ads.adthrive.com/sites/5dc336ff22eddf534ab...: 170ms CPU time
Warning::
Third-party scripts: 3201ms (100% of total)

Main Thread Breakdown

Script Evaluation 60% Other 16% Script Parsing & Compilation 14% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://ads.adthrive.com/builds/core/08b4265/es2018/js/adthrive.min.js?deployment=2026-04-21-08:ada-1811:08b4265:4&bucket=flex-63&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=5dc336ff22eddf534ab4417c630ms467ms145ms3rd
Unattributable605ms239ms0ms3rd
https://www.encyclopedia.com/400ms14ms2ms3rd
https://cdn.consentmanager.net/delivery/customdata/bV8xLndfODY2ODUucl9HRFBSLmxfZW4uZF81MzQ3MS54XzExNC52LnAudF81MzQ3MS54dF8xNTA.js355ms328ms14ms3rd
https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.js?referrer=https%3A%2F%2Fwww.encyclopedia.com%2F&cb=51170ms144ms10ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js150ms106ms42ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VTWQL8EHT3&cx=c&gtm=4e64h1149ms113ms35ms3rd
https://c.aps.amazon-adsystem.com/apstag.js139ms90ms39ms3rd
https://ads.adthrive.com/builds/core/08b4265/gdpr/vendor/prebid/es2018/prebid.min.js136ms85ms50ms3rd
https://www.encyclopedia.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js125ms97ms3ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
23 scripts, 723 KB unused
FIX
23 scripts, 723 KB unused
Warning::
https://ads.adthrive.com/builds/core/08b4265/es201...: 163 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 132 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ads.adthrive.com/builds/core/08b4265/gdpr/...: 126 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s3.amazonaws.com/downloads.mailchimp.com/j...: 90 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VTWQ...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 723 KB
723 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ads.adthrive.com/builds/core/08b4265/es2018/js/adthrive.min.js?deployment=2026-04-21-08:ada-1811:08b4265:4&bucket=flex-63&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=5dc336ff22eddf534ab4417c369 KB163 KB (44%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB132 KB (70%)✓3rd
https://ads.adthrive.com/builds/core/08b4265/gdpr/vendor/prebid/es2018/prebid.min.js159 KB126 KB (79%)✓3rd
https://s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js140 KB90 KB (64%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-VTWQL8EHT3&cx=c&gtm=4e64h1155 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W4GBLXB117 KB62 KB (53%)✓3rd
https://c.aps.amazon-adsystem.com/apstag.js78 KB50 KB (65%)✓3rd
https://cdn.consentmanager.net/delivery/js/cmp_final.min.js101 KB37 KB (37%)✓3rd
https://www.encyclopedia.com/sites/default/files/js/js_WGXfBW_MzOchPG9FUX5M7UvHZXqRJrIQ3Tfnf5S1iHg.js11 KB—✓3rd
https://www.encyclopedia.com/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZPB5lR08eWRX8vY.js5 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
65 resources · 2.6 MB · 723 KB savings available
FIX
65 resources · 2.6 MB · 723 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~723 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
2 resources over 200KB
65 resources · 2.6 MiB · 64 third-party 1.6 MiB over 1MB target
JavaScript 58% · 1.5 MiB
Image 37% · 978.4 KiB
CSS 3% · 75.5 KiB
Other 2% · 47.0 KiB
Document 0% · 10.8 KiB

~722.7 KiB of savings available

Remove unused JavaScript: 722.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 978 KB
0 oversized -0 KB
12 legacy format
6 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
7
dns-prefetch
—
prefetch
—

7 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
65 requests over 2187ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 2.0 s LCP 14.2 shttps://encyclopedia.com// https://encyclopedia.com/ — 301 — 420 B — 64 ms — h2https://www.encyclopedia.com/www.encyclopedia.com/ https://www.encyclopedia.com/ — 200 — 10.8 KiB — 37 ms — h2https://www.encyclopedia.com/sites/default/files/css/css_AxrMp2NNpMECnjp7kzTMN0neY6nPkuzEFUTf02NmHtU.csswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/css/css_AxrMp2NNpMECnjp7kzTMN0neY6nPkuzEFUTf02NmHtU.css — 200 — 2.3 KiB — 47 ms — h2https://www.encyclopedia.com/sites/default/files/css/css_PKoD1c51rXhDWjoL2z3EIsRnpif7i9DxnaRGocb8JzA.csswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/css/css_PKoD1c51rXhDWjoL2z3EIsRnpif7i9DxnaRGocb8JzA.css — 200 — 23.5 KiB — 30 ms — h2https://www.encyclopedia.com/sites/default/files/css/css_k9u1IODySqC3j4I1pBBMqRSLt5ZKAL5HHw12USc5C1U.csswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/css/css_k9u1IODySqC3j4I1pBBMqRSLt5ZKAL5HHw12USc5C1U.css — 200 — 46.8 KiB — 30 ms — h2https://www.encyclopedia.com/themes/custom/trustme/images/header-logo.jpgwww.encyclopedia.com/themes/custom/... https://www.encyclopedia.com/themes/custom/trustme/images/header-logo.jpg — 200 — 13.8 KiB — 42 ms — h2https://www.encyclopedia.com/sites/default/files/images/hero/OxfordLogo%402x_2.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/hero/OxfordLogo%402x_2.png — 200 — 2.3 KiB — 48 ms — h2https://www.encyclopedia.com/sites/default/files/images/hero/ColumbiaLogo%402x_1.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/hero/ColumbiaLogo%402x_1.png — 200 — 4.4 KiB — 47 ms — h2https://www.encyclopedia.com/sites/default/files/images/hero/CengageLogo%402x_2.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/hero/CengageLogo%402x_2.png — 200 — 2.7 KiB — 43 ms — h2https://www.encyclopedia.com/sites/default/files/images/whouseit/a70c83d26434d18cd9089a26ad0064f6%20%281%29.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/whouseit/a70c83d26434d18cd9089a26ad0064f6%20%281%29.png — 200 — 24.0 KiB — 55 ms — h2https://cdn-images.mailchimp.com/embedcode/classic-061523.csscdn-images.mailchimp.com/embedcode/... https://cdn-images.mailchimp.com/embedcode/classic-061523.css — 200 — 1.8 KiB — 59 ms — h3https://www.encyclopedia.com/sites/default/files/images/whouseit/nasa2.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/whouseit/nasa2.png — 200 — 19.6 KiB — 53 ms — h2https://www.encyclopedia.com/sites/default/files/images/whouseit/nytimes-logo-png-new-york-times-speaks-to-dr-derevensky-regarding-internet-gambling-fantasy-sports-betting-430.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/whouseit/nytimes-logo-png-new-york-times-speaks-to-dr-derevensky-regarding-internet-gambling-fantasy-sports-betting-430.png — 200 — 22.3 KiB — 53 ms — h2https://www.encyclopedia.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.jswww.encyclopedia.com/cdn-cgi/script... https://www.encyclopedia.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js — 200 — 4.2 KiB — 41 ms — h2https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.js?referrer=https%3A%2F%2Fwww.encyclopedia.com%2F&cb=51ads.adthrive.com/sites/5dc336ff22ed... https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.js?referrer=https%3A%2F%2Fwww.encyclopedia.com%2F&cb=51 — 200 — 33.8 KiB — 353 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-W4GBLXBwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-W4GBLXB — 200 — 117.4 KiB — 147 ms — h2data:image/svg+xml;utf8;base64,PHN2ZyB3aWR0aD0iMzYiIGhlaWdodD0iMzYiIHZpZXdCb3g9IjAgMCAxNiAxNiIgeG1s…data:image/svg+xml;utf8;base64,PHN2... data:image/svg+xml;utf8;base64,PHN2ZyB3aWR0aD0iMzYiIGhlaWdodD0iMzYiIHZpZXdCb3g9IjAgMCAxNiAxNiIgeG1s… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIg…data:image/svg+xml;utf8;base64,PHN2... data:image/svg+xml;utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIg… — 200 — 0 B — 0 ms — datahttps://www.encyclopedia.com/sites/default/files/images/hero/enc_hero01_3.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/hero/enc_hero01_3.png — 200 — 568.8 KiB — 160 ms — h3https://www.encyclopedia.com/sites/default/files/0/627218.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/0/627218.jpg — 200 — 46.3 KiB — 128 ms — h3https://www.encyclopedia.com/sites/default/files/4/2792955.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/4/2792955.jpg — 200 — 42.6 KiB — 133 ms — h3https://www.encyclopedia.com/sites/default/files/6/2801633.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/6/2801633.jpg — 200 — 43.6 KiB — 133 ms — h3https://www.encyclopedia.com/sites/default/files/4/2793250.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/4/2793250.jpg — 200 — 76.9 KiB — 135 ms — h3https://www.encyclopedia.com/sites/default/files/4/2796049.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/4/2796049.jpg — 200 — 44.3 KiB — 132 ms — h3https://www.encyclopedia.com/sites/default/files/6/2801644.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/6/2801644.jpg — 200 — 23.6 KiB — 119 ms — h3https://www.encyclopedia.com/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZPB5lR08eWRX8vY.jswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZPB5lR08eWRX8vY.js — 200 — 4.5 KiB — 59 ms — h3https://www.encyclopedia.com/sites/default/files/js/js_WGXfBW_MzOchPG9FUX5M7UvHZXqRJrIQ3Tfnf5S1iHg.jswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/js/js_WGXfBW_MzOchPG9FUX5M7UvHZXqRJrIQ3Tfnf5S1iHg.js — 200 — 11.4 KiB — 76 ms — h3https://www.encyclopedia.com/sites/default/files/js/js_yLV6HYxC2Rnf9ZekS8oWsZmUNhr7FkzcQDF4zydcT90.jswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/js/js_yLV6HYxC2Rnf9ZekS8oWsZmUNhr7FkzcQDF4zydcT90.js — 200 — 14.2 KiB — 82 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h3https://eu-us.consentmanager.net/delivery/info/?id=86685&did=4&cfdid=4&t=pv.d_ncs.d_ancs.d_bncs.cv&h=https%3A%2F%2Fwww.encyclopedia.com%2F&o=1776806948444&l=EN&lv=231778&d=4&ct=14&e=&e2=&e3=&i=&sv=150&dv=114&eu-us.consentmanager.net/delivery/i... https://eu-us.consentmanager.net/delivery/info/?id=86685&did=4&cfdid=4&t=pv.d_ncs.d_ancs.d_bncs.cv&h=https%3A%2F%2Fwww.encyclopedia.com%2F&o=1776806948444&l=EN&lv=231778&d=4&ct=14&e=&e2=&e3=&i=&sv=150&dv=114& — 200 — 321 B — 130 ms — h2https://eu-us-cdn.consentmanager.net/delivery/flags/en.gifeu-us-cdn.consentmanager.net/delive... https://eu-us-cdn.consentmanager.net/delivery/flags/en.gif — 200 — 814 B — 60 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 114 ms — h2https://www.encyclopedia.com/sites/default/files/favicon.icowww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/favicon.ico — 200 — 754 B — 27 ms — h3https://www.encyclopedia.com/pick_of_the_week?_format=jsonwww.encyclopedia.com/pick_of_the_we... https://www.encyclopedia.com/pick_of_the_week?_format=json — 200 — 1.3 KiB — 29 ms — h3https://cdn.jwplayer.com/v2/playlists/WQuApcCp?max_resolution=320cdn.jwplayer.com/v2/playlists/WQuAp... https://cdn.jwplayer.com/v2/playlists/WQuApcCp?max_resolution=320 — 200 — 1.5 KiB — 325 ms — h2https://config.aps.amazon-adsystem.com/configs/4fbba76f-7987-4fa2-9733-c27eb3a2170bconfig.aps.amazon-adsystem.com/conf... https://config.aps.amazon-adsystem.com/configs/4fbba76f-7987-4fa2-9733-c27eb3a2170b — 200 — 2.3 KiB — 41 ms — h2https://c.amazon-adsystem.com/cdn/prod/config?src=600&u=https%3A%2F%2Fwww.encyclopedia.com&pubid=4fbba76f-7987-4fa2-9733-c27eb3a2170bc.amazon-adsystem.com/cdn/prod/conf... https://c.amazon-adsystem.com/cdn/prod/config?src=600&u=https%3A%2F%2Fwww.encyclopedia.com&pubid=4fbba76f-7987-4fa2-9733-c27eb3a2170b — 200 — 1.5 KiB — 9 ms — h2https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.cssads.adthrive.com/sites/5dc336ff22ed... https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.css — 200 — 1.0 KiB — 4 ms — h2data:image/svg+xml;utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIg…data:image/svg+xml;utf8;base64,PHN2... data:image/svg+xml;utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIg… — 200 — 0 B — 0 ms — datahttps://www.encyclopedia.com/sites/default/files/3/2014558.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/3/2014558.jpg — 200 — 4.9 KiB — 30 ms — h3https://www.encyclopedia.com/sites/default/files/10/5985964.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/10/5985964.jpg — 200 — 36.2 KiB — 30 ms — h3https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1131500445&t=pageview&_s=1&dl=https%3A%2F%2Fwww.encyclopedia.com%2F&ul=en-us&dt=Encyclopedia.com%20%7C%20Free%20Online%20Encyclopedia&sr=412x823&vp=412x823&_u=IADAAEABAAAAACAAI~&jid=220095932&gjid=888913944&cid=1797358198.1776806948&tid=UA-64847704-1&_gid=1383348426.1776806949&_r=1&_slc=1&z=1794180556www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1131500445&t=pageview&_s=1&dl=https%3A%2F%2Fwww.encyclopedia.com%2F&ul=en-us&dt=Encyclopedia.com%20%7C%20Free%20Online%20Encyclopedia&sr=412x823&vp=412x823&_u=IADAAEABAAAAACAAI~&jid=220095932&gjid=888913944&cid=1797358198.1776806948&tid=UA-64847704-1&_gid=1383348426.1776806949&_r=1&_slc=1&z=1794180556 — 200 — 456 B — 25 ms — h2https://pagead2.googlesyndication.com/pagead/ping?e=1pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/ping?e=1 — 204 — 20 B — 94 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3201ms · 1412KB · €35/mo
ads.adthrive.com
Other
Costly
Execution 630ms
Transfer 369 KB
Unused 44%
Monthly Cost €7/mo
Unattributable
Other
Costly
Execution 605ms
Transfer 0 KB
Monthly Cost €7/mo
www.encyclopedia.com
Other
Costly
Execution 400ms
Transfer 11 KB
Monthly Cost €4/mo
cdn.consentmanager.net
Other
Costly
Execution 355ms
Transfer 21 KB
Monthly Cost €4/mo
ads.adthrive.com
Other
Optional
Execution 170ms
Transfer 34 KB
Monthly Cost €2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 150ms
Transfer 188 KB
Unused 70%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 149ms
Transfer 155 KB
Unused 41%
Monthly Cost €2/mo
c.aps.amazon-adsystem.com
Other
Optional
Execution 139ms
Transfer 78 KB
Unused 65%
Monthly Cost €2/mo
ads.adthrive.com
Other
Optional
Execution 136ms
Transfer 159 KB
Unused 79%
Monthly Cost €1/mo
www.encyclopedia.com
Other
Optional
Execution 125ms
Transfer 4 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 121ms
Transfer 117 KB
Unused 53%
Monthly Cost €1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 86ms
Transfer 34 KB
Monthly Cost €1/mo
cdn.consentmanager.net
Other
Optional
Execution 70ms
Transfer 101 KB
Unused 37%
Monthly Cost €1/mo
s3.amazonaws.com
Other
Optional
Execution 65ms
Transfer 140 KB
Unused 64%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • ads.adthrive.com adds 630ms and costs ~€7/month
  • Unattributable adds 605ms and costs ~€7/month
  • www.encyclopedia.com adds 400ms and costs ~€4/month
  • cdn.consentmanager.net adds 355ms and costs ~€4/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

ads.adthrive.com takes 630ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 605ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.encyclopedia.com takes 400ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.consentmanager.net takes 355ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

70% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

65% of c.aps.amazon-adsystem.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

79% of ads.adthrive.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

53% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

64% of s3.amazonaws.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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