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https://worldhistory.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
90
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.25 s

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

1.45 s

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

28 ms

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

0.033

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

1.69 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.

4.04 s

Page Load Progression

545 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.3 s
3.8 s
4.4 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 119 requests
FIX
4.1 MB transferred, 119 requests
Critical::
Page weighs 7.9 MB (4.1 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Warning::
119 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.85 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
119 requests
0.85 g CO2 per page load
Images 2.6 MiB 64%
JavaScript 1.3 MiB 31%
Fonts 56.8 KiB 1%
HTML 55.4 KiB 1%
Other 32.4 KiB 1%
Other 28.3 KiB 1%
Other 25.9 KiB 1%
CSS 10.0 KiB 0%
Other 780 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
22 scripts, 579 KB unused
FIX
22 scripts, 579 KB unused
Warning::
https://ads.adthrive.com/builds/core/1f62ade/es201...: 177 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 138 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ads.adthrive.com/builds/core/1f62ade/gdpr/...: 116 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DMCY...: 63 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c.aps.amazon-adsystem.com/apstag.js: 50 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 579 KB
579 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ads.adthrive.com/builds/core/1f62ade/es2018/js/adthrive.min.js?deployment=2026-04-22-08:pe-993:1f62ade:4&bucket=flex-16&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=65a6e420255ef424515e267b370 KB177 KB (48%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097963187 KB138 KB (73%)✓3rd
https://ads.adthrive.com/builds/core/1f62ade/gdpr/vendor/prebid/es2018/prebid.min.js159 KB116 KB (73%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DMCY1BLGCJ174 KB63 KB (36%)✓3rd
https://c.aps.amazon-adsystem.com/apstag.js78 KB50 KB (64%)✓3rd
https://cdn.consentmanager.net/delivery/js/cmp_final.min.js101 KB36 KB (36%)✓3rd
https://www.worldhistory.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?13 KB—✓3rd
https://www.worldhistory.org/ajax/visitor-info.js.php?v=17761703721 KB—✓3rd
https://www.worldhistory.org/js/kwicks.min.2.2.1.js4 KB—✓3rd
https://www.worldhistory.org/js/deferred-min.js?v=177617037212 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
119 resources · 4.1 MB · 579 KB savings available
FIX
119 resources · 4.1 MB · 579 KB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~579 KB of savings available
Warning::
118 third-party resources (100% of weight)
Info::
3 resources over 200KB
119 resources · 4.1 MiB · 118 third-party 3.1 MiB over 1MB target
Image 64% · 2.6 MiB
JavaScript 31% · 1.3 MiB
Other 2% · 79.4 KiB
Font 1% · 56.8 KiB
Document 1% · 55.4 KiB
CSS 0% · 10.0 KiB

~579.3 KiB of savings available

Remove unused JavaScript: 579.3 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
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Warning::
https://widgets.guidestar.org/prod/v1/pdp/transpar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.worldhistory.org/template/images/app/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.worldhistory.org/template/images/app/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://files.worldhistory.org/Images/Forsaken_14t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
46 images 2.6 MB
0 oversized -0 KB
40 legacy format
4 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

C
JS Execution Cost
Action
1120ms total JS execution
REVIEW
1120ms total JS execution
Warning::
Unattributable: 303ms CPU time
Info::
https://www.worldhistory.org/: 212ms CPU time
Info::
https://cdn.consentmanager.net/delivery/customdata...: 108ms CPU time
Info::
https://ads.adthrive.com/builds/core/1f62ade/gdpr/...: 95ms CPU time
Info::
https://ads.adthrive.com/builds/core/1f62ade/es201...: 79ms CPU time
Warning::
Third-party scripts: 1120ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 23% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
Unattributable303ms65ms0ms3rd
https://www.worldhistory.org/212ms22ms4ms3rd
https://cdn.consentmanager.net/delivery/customdata/bV8xLndfMTQzNTE2LnJfR0RQUi5sX2VuLmRfMzQ3NDIueF8xMDIudi5wLnRfMzQ3NDIueHRfMTEy.js108ms103ms2ms3rd
https://ads.adthrive.com/builds/core/1f62ade/gdpr/vendor/prebid/es2018/prebid.min.js95ms73ms14ms3rd
https://ads.adthrive.com/builds/core/1f62ade/es2018/js/adthrive.min.js?deployment=2026-04-22-08:pe-993:1f62ade:4&bucket=flex-16&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=65a6e420255ef424515e267b79ms46ms32ms3rd
https://c.aps.amazon-adsystem.com/apstag.js74ms54ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DMCY1BLGCJ69ms49ms13ms3rd
https://www.worldhistory.org/cdn-cgi/challenge-platform/scripts/jsd/main.js65ms60ms1ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=3109796363ms51ms12ms3rd
https://ads.adthrive.com/sites/65a6e420255ef424515e267b/ads.min.js?referrer=https%3A%2F%2Fwww.worldhistory.org%2F&cb=651ms43ms3ms3rd
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
2 fonts (57 KB)
PASS
2 fonts (57 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

57 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.5 shttps://fonts.gstatic.com/s/karla/v33/qkB9XvYC6trAT55ZBi1ueQVIjQTD-JrIH2G7nytkHRyQ8p4wUje6bmMorHA.woff2qkB9XvYC6trAT55ZBi1ueQV... https://fonts.gstatic.com/s/karla/v33/qkB9XvYC6trAT55ZBi1ueQVIjQTD-JrIH2G7nytkHRyQ8p4wUje6bmMorHA.woff2 — 23.7 KiB — 42 ms — font-display: swaphttps://fonts.gstatic.com/s/librebaskerville/v24/kmKnZrc3Hgbbcjq75U4uslyuy4kn0qNZaxMaC82U.woff2kmKnZrc3Hgbbcjq75U4usly... https://fonts.gstatic.com/s/librebaskerville/v24/kmKnZrc3Hgbbcjq75U4uslyuy4kn0qNZaxMaC82U.woff2 — 33.1 KiB — 68 ms — font-display: swap
qkB9XvYC6trAT55ZBi1ueQV... woff2 swap
Size 24 KB
Load time 42 ms
Start 284 ms
Risk FOUT — text flashes from fallback to web font
kmKnZrc3Hgbbcjq75U4usly... woff2 swap
Size 33 KB
Load time 68 ms
Start 285 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
119 requests over 2227ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 1.5 shttps://worldhistory.org// https://worldhistory.org/ — 301 — 218 B — 46 ms — h3https://www.worldhistory.org/www.worldhistory.org/ https://www.worldhistory.org/ — 200 — 55.4 KiB — 104 ms — h3https://www.worldhistory.org/template/images/bg_timeline.pngwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/bg_timeline.png — 200 — 1.6 KiB — 29 ms — h3https://www.worldhistory.org/ajax/visitor-info.js.php?v=1776170372www.worldhistory.org/ajax/visitor-i... https://www.worldhistory.org/ajax/visitor-info.js.php?v=1776170372 — 200 — 636 B — 424 ms — h3https://cdn.jsdelivr.net/npm/jquery@3.6.1/dist/jquery.min.jscdn.jsdelivr.net/npm/jquery@3.6.1/d... https://cdn.jsdelivr.net/npm/jquery@3.6.1/dist/jquery.min.js — 200 — 31.7 KiB — 12 ms — h2https://www.worldhistory.org/js/ahe-min.js?v=1776170372www.worldhistory.org/js/ahe-min.js?... https://www.worldhistory.org/js/ahe-min.js?v=1776170372 — 200 — 20.3 KiB — 34 ms — h3https://www.worldhistory.org/analytics/pageview.js?v=1776170372www.worldhistory.org/analytics/page... https://www.worldhistory.org/analytics/pageview.js?v=1776170372 — 200 — 2.3 KiB — 29 ms — h3https://www.worldhistory.org/js/kwicks.min.2.2.1.jswww.worldhistory.org/js/kwicks.min.... https://www.worldhistory.org/js/kwicks.min.2.2.1.js — 200 — 3.6 KiB — 32 ms — h3https://fonts.googleapis.com/css?family=Karla:400,700|Libre+Baskerville:400,400i,700&subset=latin-ext&display=swapfonts.googleapis.com/css?family=Kar... https://fonts.googleapis.com/css?family=Karla:400,700|Libre+Baskerville:400,400i,700&subset=latin-ext&display=swap — 200 — 1.0 KiB — 75 ms — h2https://www.worldhistory.org/app-manifest.json?v=1776170372www.worldhistory.org/app-manifest.j... https://www.worldhistory.org/app-manifest.json?v=1776170372 — 200 — 780 B — 45 ms — h3https://www.googletagmanager.com/gtag/js?id=G-DMCY1BLGCJwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-DMCY1BLGCJ — 200 — 174.2 KiB — 221 ms — h2https://tracker.metricool.com/c3po.jpg?hash=583da8995f3bf53448b13ddf790ada6ctracker.metricool.com/c3po.jpg?hash... https://tracker.metricool.com/c3po.jpg?hash=583da8995f3bf53448b13ddf790ada6c — 200 — 2.9 KiB — 101 ms — h3https://www.worldhistory.org/template/images/whe_square_white.svgwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/whe_square_white.svg — 200 — 1.6 KiB — 27 ms — h3https://www.worldhistory.org/images/google_preferred_source_badge_2x.pngwww.worldhistory.org/images/google_... https://www.worldhistory.org/images/google_preferred_source_badge_2x.png — 200 — 10.3 KiB — 32 ms — h3https://www.worldhistory.org/images/anthem-24-silver-winnner.pngwww.worldhistory.org/images/anthem-... https://www.worldhistory.org/images/anthem-24-silver-winnner.png — 200 — 17.8 KiB — 38 ms — h3https://www.worldhistory.org/images/ahe-webaward-200x200.pngwww.worldhistory.org/images/ahe-web... https://www.worldhistory.org/images/ahe-webaward-200x200.png — 200 — 9.8 KiB — 76 ms — h3https://www.worldhistory.org/images/lovie-award-badge.pngwww.worldhistory.org/images/lovie-a... https://www.worldhistory.org/images/lovie-award-badge.png — 200 — 7.0 KiB — 94 ms — h3https://www.worldhistory.org/images/reimagine-edu-shortlisted.pngwww.worldhistory.org/images/reimagi... https://www.worldhistory.org/images/reimagine-edu-shortlisted.png — 200 — 28.3 KiB — 95 ms — h3https://www.worldhistory.org/images/award-tutorful-200px.pngwww.worldhistory.org/images/award-t... https://www.worldhistory.org/images/award-tutorful-200px.png — 200 — 10.2 KiB — 41 ms — h3https://www.worldhistory.org/images/tutorhouse.pngwww.worldhistory.org/images/tutorho... https://www.worldhistory.org/images/tutorhouse.png — 200 — 18.3 KiB — 117 ms — h3https://storage.googleapis.com/goodpods-images-bucket/leaderboard_badges/history_all-history_top50_month.pngstorage.googleapis.com/goodpods-ima... https://storage.googleapis.com/goodpods-images-bucket/leaderboard_badges/history_all-history_top50_month.png — 200 — 18.2 KiB — 143 ms — h2https://widgets.guidestar.org/prod/v1/pdp/transparency-seal/15451557/svgwidgets.guidestar.org/prod/v1/pdp/t... https://widgets.guidestar.org/prod/v1/pdp/transparency-seal/15451557/svg — 200 — 4.5 KiB — 715 ms — h2https://files.worldhistory.org/Images/Forsaken_14th_Century/mockup_forsaken_14th_century_600px.pngfiles.worldhistory.org/Images/Forsa... https://files.worldhistory.org/Images/Forsaken_14th_Century/mockup_forsaken_14th_century_600px.png — 200 — 424.6 KiB — 287 ms — h3https://www.worldhistory.org/template/images/membership/membership-sidetab-en.svg?v=1776170372www.worldhistory.org/template/image... https://www.worldhistory.org/template/images/membership/membership-sidetab-en.svg?v=1776170372 — 200 — 2.8 KiB — 58 ms — h3https://www.worldhistory.org/template/images/app/button_app_store.pngwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/app/button_app_store.png — 200 — 4.0 KiB — 62 ms — h3https://www.worldhistory.org/template/images/app/button_google_play.pngwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/app/button_google_play.png — 200 — 6.9 KiB — 65 ms — h3https://www.worldhistory.org/template/css/exclude/deferred.css?v=1776170372www.worldhistory.org/template/css/e... https://www.worldhistory.org/template/css/exclude/deferred.css?v=1776170372 — 200 — 6.2 KiB — 90 ms — h3https://www.worldhistory.org/template/images/header/subject_headers/mesopotamia_shadow.jpgwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/header/subject_headers/mesopotamia_shadow.jpg — 200 — 33.6 KiB — 152 ms — h3https://www.worldhistory.org/template/images/accordion/encyclopedia.pngwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/accordion/encyclopedia.png — 200 — 165.8 KiB — 244 ms — h3https://www.worldhistory.org/template/images/accordion/education.png?v=3www.worldhistory.org/template/image... https://www.worldhistory.org/template/images/accordion/education.png?v=3 — 200 — 133.3 KiB — 233 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 1.5 shttps://worldhistory.org// https://worldhistory.org/ — 301 — 218 B — 46 ms — h3https://www.worldhistory.org/www.worldhistory.org/ https://www.worldhistory.org/ — 200 — 55.4 KiB — 104 ms — h3https://www.worldhistory.org/template/images/bg_timeline.pngwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/bg_timeline.png — 200 — 1.6 KiB — 29 ms — h3https://www.worldhistory.org/ajax/visitor-info.js.php?v=1776170372www.worldhistory.org/ajax/visitor-i... https://www.worldhistory.org/ajax/visitor-info.js.php?v=1776170372 — 200 — 636 B — 424 ms — h3https://cdn.jsdelivr.net/npm/jquery@3.6.1/dist/jquery.min.jscdn.jsdelivr.net/npm/jquery@3.6.1/d... https://cdn.jsdelivr.net/npm/jquery@3.6.1/dist/jquery.min.js — 200 — 31.7 KiB — 12 ms — h2https://www.worldhistory.org/js/ahe-min.js?v=1776170372www.worldhistory.org/js/ahe-min.js?... https://www.worldhistory.org/js/ahe-min.js?v=1776170372 — 200 — 20.3 KiB — 34 ms — 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h2https://id5-sync.com/api/config/prebidid5-sync.com/api/config/prebid https://id5-sync.com/api/config/prebid — 200 — 658 B — 83 ms — h2https://cdn.id5-sync.com/api/1.0/id5PrebidModule.jscdn.id5-sync.com/api/1.0/id5PrebidM... https://cdn.id5-sync.com/api/1.0/id5PrebidModule.js — 200 — 29.5 KiB — 74 ms — h2https://id.crwdcntrl.net/id?c=17297id.crwdcntrl.net/id?c=17297 https://id.crwdcntrl.net/id?c=17297 — 200 — 324 B — 116 ms — h2https://at.teads.tv/fpc?analytics_tag_id=PUB_17002&tfpvi=&gdpr_consent=&gdpr_status=22&gdpr_reason=220&ccpa_consent=&sv=prebid-v1at.teads.tv/fpc?analytics_tag_id=PU... https://at.teads.tv/fpc?analytics_tag_id=PUB_17002&tfpvi=&gdpr_consent=&gdpr_status=22&gdpr_reason=220&ccpa_consent=&sv=prebid-v1 — 200 — 432 B — 86 ms — h2https://match.adsrvr.org/track/rid?ttd_pid=iowij76&fmt=jsonmatch.adsrvr.org/track/rid?ttd_pid=... https://match.adsrvr.org/track/rid?ttd_pid=iowij76&fmt=json — 200 — 430 B — 138 ms — h2https://ads.adthrive.com/sites/65a6e420255ef424515e267b/ads.min.cssads.adthrive.com/sites/65a6e420255e... https://ads.adthrive.com/sites/65a6e420255ef424515e267b/ads.min.css — 200 — 838 B — 4 ms — h2https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fwww.worldhistory.org%2F&domain=www.worldhistory.org&cw=1&lsw=1gum.criteo.com/sid/json?origin=preb... https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fwww.worldhistory.org%2F&domain=www.worldhistory.org&cw=1&lsw=1 — 200 — 379 B — 55 ms — h2https://eu-us.consentmanager.net/delivery/info/?id=143516&did=1&cfdid=1&t=pv.d_ncs.d_ancs.d_bncs.cv&h=https%3A%2F%2Fwww.worldhistory.org%2F&o=1776890475812&l=EN&lv=103409&d=1&ct=14&e=&e2=&e3=&i=&sv=112&dv=102&eu-us.consentmanager.net/delivery/i... https://eu-us.consentmanager.net/delivery/info/?id=143516&did=1&cfdid=1&t=pv.d_ncs.d_ancs.d_bncs.cv&h=https%3A%2F%2Fwww.worldhistory.org%2F&o=1776890475812&l=EN&lv=103409&d=1&ct=14&e=&e2=&e3=&i=&sv=112&dv=102& — 200 — 321 B — 103 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 — 815 B — 62 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 — 16 ms — h2https://c.amazon-adsystem.com/cdn/prod/config?src=600&u=https%3A%2F%2Fwww.worldhistory.org&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.worldhistory.org&pubid=4fbba76f-7987-4fa2-9733-c27eb3a2170b — 200 — 1.5 KiB — 9 ms — h2https://api.id5-sync.com/analytics/367/id5-api-jsapi.id5-sync.com/analytics/367/id5-... https://api.id5-sync.com/analytics/367/id5-api-js — 200 — 691 B — 86 ms — h2https://www.worldhistory.org/cdn-cgi/rum?www.worldhistory.org/cdn-cgi/rum? https://www.worldhistory.org/cdn-cgi/rum? — 204 — 272 B — 23 ms — h3https://www.worldhistory.org/template/images/whe-favicon-32px.pngwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/whe-favicon-32px.png — 200 — 892 B — 33 ms — h3https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gptsecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gpt — 200 — 23.0 KiB — 38 ms — h3https://www.worldhistory.org/template/images/whe-favicon-192px.pngwww.worldhistory.org/template/image... https://www.worldhistory.org/template/images/whe-favicon-192px.png — 200 — 3.5 KiB — 36 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-DMCY1BLGCJ&gtm=45je64k1h2v879717329za200zd879717329&_p=1776890474691&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&tcfd=1000h&gdid=dMzk4MW&ecid=1077611758&_eu=AAAAAEA&_prs=gs.wg&are=1&cid=384208797.1776890476&ec_mode=a&frm=0&pscdl=denied&rcb=12&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938468~117266400~117512543~118128923&sid=1776890475&sct=1&seg=0&dl=https%3A%2F%2Fwww.worldhistory.org%2F&dt=World%20History%20Encyclopedia&en=page_view&_fv=1&_nsi=1&_ss=2&_ee=1&ep.anonymize_ip=true&ep.ab=a&ep.ci_language=en&epn.user_known=0&ep.user_engagement=none&epn.user_member=0&epn.user_logged_in=0&epn.user_donor=0&ep.ci_type_id=(none)&ep.acq_referrer=(direct)&ep.acq_source=(none)&ep.acq_medium=(none)&ep.acq_campaign=(none)&up.ab=a&up.engagement=none&upn.known=0&up.user_group=unknown&tfd=1812region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-DMCY1BLGCJ&gtm=45je64k1h2v879717329za200zd879717329&_p=1776890474691&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&tcfd=1000h&gdid=dMzk4MW&ecid=1077611758&_eu=AAAAAEA&_prs=gs.wg&are=1&cid=384208797.1776890476&ec_mode=a&frm=0&pscdl=denied&rcb=12&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938468~117266400~117512543~118128923&sid=1776890475&sct=1&seg=0&dl=https%3A%2F%2Fwww.worldhistory.org%2F&dt=World%20History%20Encyclopedia&en=page_view&_fv=1&_nsi=1&_ss=2&_ee=1&ep.anonymize_ip=true&ep.ab=a&ep.ci_language=en&epn.user_known=0&ep.user_engagement=none&epn.user_member=0&epn.user_logged_in=0&epn.user_donor=0&ep.ci_type_id=(none)&ep.acq_referrer=(direct)&ep.acq_source=(none)&ep.acq_medium=(none)&ep.acq_campaign=(none)&up.ab=a&up.engagement=none&upn.known=0&up.user_group=unknown&tfd=1812 — 204 — 553 B — 67 ms — h2https://id5-sync.com/bounceid5-sync.com/bounce https://id5-sync.com/bounce — 200 — 528 B — 27 ms — h2https://lbs.eu-1-id5-sync.com/lbs/v1lbs.eu-1-id5-sync.com/lbs/v1 https://lbs.eu-1-id5-sync.com/lbs/v1 — 200 — 165 B — 83 ms — h2https://lb.eu-1-id5-sync.com/lb/v1lb.eu-1-id5-sync.com/lb/v1 https://lb.eu-1-id5-sync.com/lb/v1 — 200 — 350 B — 81 ms — h2https://d0.eu-3-id5-sync.com/d0.eu-3-id5-sync.com/ https://d0.eu-3-id5-sync.com/ — 200 — 143 B — 98 ms — h2https://d1.eu-3-id5-sync.com/d1.eu-3-id5-sync.com/ https://d1.eu-3-id5-sync.com/ — 200 — 143 B — 100 ms — h2https://d2.eu-3-id5-sync.com/d2.eu-3-id5-sync.com/ https://d2.eu-3-id5-sync.com/ — 200 — 143 B — 115 ms — h2https://d3.eu-3-id5-sync.com/d3.eu-3-id5-sync.com/ https://d3.eu-3-id5-sync.com/ — 200 — 143 B — 101 ms — h2https://d4.eu-3-id5-sync.com/d4.eu-3-id5-sync.com/ https://d4.eu-3-id5-sync.com/ — 200 — 143 B — 94 ms — h2https://d5.eu-3-id5-sync.com/d5.eu-3-id5-sync.com/ https://d5.eu-3-id5-sync.com/ — 200 — 143 B — 98 ms — h2https://d6.eu-3-id5-sync.com/d6.eu-3-id5-sync.com/ https://d6.eu-3-id5-sync.com/ — 200 — 143 B — 101 ms — h2https://d7.eu-3-id5-sync.com/d7.eu-3-id5-sync.com/ https://d7.eu-3-id5-sync.com/ — 200 — 143 B — 100 ms — h2https://d0.eu-4-id5-sync.com/d0.eu-4-id5-sync.com/ https://d0.eu-4-id5-sync.com/ — 200 — 143 B — 101 ms — h2https://d1.eu-4-id5-sync.com/d1.eu-4-id5-sync.com/ https://d1.eu-4-id5-sync.com/ — 200 — 143 B — 106 ms — h2https://d2.eu-4-id5-sync.com/d2.eu-4-id5-sync.com/ https://d2.eu-4-id5-sync.com/ — 200 — 143 B — 103 ms — h2https://d3.eu-4-id5-sync.com/d3.eu-4-id5-sync.com/ https://d3.eu-4-id5-sync.com/ — 200 — 143 B — 96 ms — h2https://d4.eu-4-id5-sync.com/d4.eu-4-id5-sync.com/ https://d4.eu-4-id5-sync.com/ — 200 — 143 B — 107 ms — h2https://d5.eu-4-id5-sync.com/d5.eu-4-id5-sync.com/ https://d5.eu-4-id5-sync.com/ — 200 — 143 B — 95 ms — h2https://d6.eu-4-id5-sync.com/d6.eu-4-id5-sync.com/ https://d6.eu-4-id5-sync.com/ — 200 — 143 B — 102 ms — h2https://d7.eu-4-id5-sync.com/d7.eu-4-id5-sync.com/ https://d7.eu-4-id5-sync.com/ — 200 — 143 B — 100 ms — h2https://id5-sync.com/gm/v3id5-sync.com/gm/v3 https://id5-sync.com/gm/v3 — 200 — 844 B — 27 ms — h2
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 1120ms · 1081KB · €18/mo
Unattributable
Other
Costly
Execution 303ms
Transfer 0 KB
Monthly Cost €5/mo
www.worldhistory.org
Other
Costly
Execution 212ms
Transfer 55 KB
Monthly Cost €3/mo
cdn.consentmanager.net
Other
Optional
Execution 108ms
Transfer 22 KB
Monthly Cost €2/mo
ads.adthrive.com
Other
Optional
Execution 95ms
Transfer 159 KB
Unused 73%
Monthly Cost €2/mo
ads.adthrive.com
Other
Optional
Execution 79ms
Transfer 370 KB
Unused 48%
Monthly Cost €1/mo
c.aps.amazon-adsystem.com
Other
Optional
Execution 74ms
Transfer 78 KB
Unused 64%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 69ms
Transfer 174 KB
Unused 36%
Monthly Cost €1/mo
www.worldhistory.org
Other
Optional
Execution 65ms
Transfer 0 KB
Monthly Cost €1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 63ms
Transfer 187 KB
Unused 73%
Monthly Cost €1/mo
ads.adthrive.com
Other
Optional
Execution 51ms
Transfer 34 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 303ms and costs ~€5/month
  • www.worldhistory.org adds 212ms and costs ~€3/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

Unattributable takes 303ms 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.worldhistory.org takes 212ms 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

73% 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

64% 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

73% 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

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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