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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
29
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

7.71 s

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

20.96 s

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

2.65 s

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

0.000

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

7.71 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.

21.66 s

Page Load Progression

595 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
4.8 MB transferred, 124 requests
FIX
4.8 MB transferred, 124 requests
Critical::
Page weighs 9.5 MB (4.8 MB transferred)
Warning::
Images are 2.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.8 MB
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Warning::
124 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.0 g CO2 per page load
4.8 MB / 2.4 MB budget
4.8 MB transferred
124 requests
1.0 g CO2 per page load
Images 2.8 MiB 57%
JavaScript 1.8 MiB 36%
Fonts 187.0 KiB 4%
CSS 74.0 KiB 1%
HTML 26.9 KiB 1%
Other 9.1 KiB 0%
Other 7.6 KiB 0%
Other 1.1 KiB 0%
Other 953 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 (4.8 MiB of 4.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7016ms total JS execution
FIX
7016ms total JS execution
Warning::
Unattributable: 2441ms CPU time
Warning::
https://www.chess.com/: 1019ms CPU time
Warning::
https://www.chess.com/bundles/app/vite/common.Dznm...: 995ms CPU time
Warning::
https://www.chess.com/bundles/app/js/web.chunk.cli...: 471ms CPU time
Warning::
https://www.chess.com/bundles/app/js/global-app-in...: 377ms CPU time
Warning::
Third-party scripts: 7016ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 28% Style & Layout 10% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
Unattributable2441ms593ms0ms3rd
https://www.chess.com/1019ms52ms26ms3rd
https://www.chess.com/bundles/app/vite/common.Dznmi7HDZK.chunk.js995ms916ms3ms3rd
https://www.chess.com/bundles/app/js/web.chunk.client.db655030.js471ms387ms51ms3rd
https://www.chess.com/bundles/app/js/global-app-init.chunk.client.e02dc005.js377ms338ms16ms3rd
https://www.chess.com/bundles/app/js/sentry.client.ab73093b.js288ms221ms22ms3rd
https://www.chess.com/bundles/app/js/index.client.644c35a4.js195ms160ms31ms3rd
https://www.chess.com/bundles/app/js/landing-page.client.c273ac3d.js169ms121ms44ms3rd
https://www.chess.com/bundles/app/js/turnstile.client.fdded8a7.js162ms158ms3ms3rd
https://www.chess.com/bundles/app/js/coach-client.chunk.client.b5b3bfce.js146ms138ms7ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
61 scripts, 572 KB unused
FIX
61 scripts, 572 KB unused
Warning::
https://www.chess.com/bundles/app/js/vue.dll.c1ed7...: 153 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.chess.com/bundles/app/js/web.chunk.cli...: 99 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.chess.com/bundles/app/js/web.chunk.cli...: 99 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.chess.com/bundles/app/js/landing-page....: 57 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.chess.com/bundles/app/vite/common.AO98...: 42 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 572 KB
572 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.chess.com/bundles/app/js/vue.dll.c1ed70f2.js213 KB153 KB (72%)✓3rd
https://www.chess.com/bundles/app/js/web.chunk.client.c501b5ae.js106 KB99 KB (94%)✓3rd
https://www.chess.com/bundles/app/js/web.chunk.client.cc4f64ab.js106 KB99 KB (94%)✓3rd
https://www.chess.com/bundles/app/js/landing-page.client.c273ac3d.js77 KB57 KB (75%)✓3rd
https://www.chess.com/bundles/app/vite/common.AO98t6A9Lx.chunk.js45 KB42 KB (93%)✓3rd
https://www.chess.com/bundles/app/vite/vendors/vue.runtime.esm-bundler.CsWIWiQsn3.js53 KB33 KB (64%)✗3rd
https://www.chess.com/bundles/app/vite/common.tcMo54zQ4X.chunk.js38 KB33 KB (88%)✓3rd
https://www.chess.com/bundles/app/vite/common.BBWXPFjHfi.chunk.js32 KB30 KB (96%)✓3rd
https://www.chess.com/bundles/app/js/web.chunk.client.f3acd298.js46 KB25 KB (54%)✓3rd
https://www.chess.com/bundles/app/js/index.client.644c35a4.js51 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
124 resources · 4.8 MB · 572 KB savings available
FIX
124 resources · 4.8 MB · 572 KB savings available
Warning::
Page weight 3.8 MB over 1MB target
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~572 KB of savings available
Warning::
123 third-party resources (100% of weight)
Info::
2 resources over 200KB
124 resources · 4.8 MiB · 123 third-party 3.8 MiB over 1MB target
Image 57% · 2.8 MiB
JavaScript 36% · 1.8 MiB
Font 4% · 187.0 KiB
CSS 1% · 74.0 KiB
Document 1% · 26.9 KiB
Other 0% · 9.7 KiB

~571.7 KiB of savings available

Remove unused JavaScript: 571.7 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.

B
Image Optimization
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 2.8 MB
0 oversized -0 KB
17 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
3 fonts (187 KB)
PASS
3 fonts (187 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

187 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s FCP 7.7 s LCP 21.0 shttps://www.chess.com/bundles/web/fonts/chessglyph-v3/chessglyph-v3.3e78f81f.woff2chessglyph-v3.3e78f81f.... https://www.chess.com/bundles/web/fonts/chessglyph-v3/chessglyph-v3.3e78f81f.woff2 — 67.4 KiB — 138 ms — font-display: swaphttps://www.chess.com/bundles/web/fonts/chess-sans/chess-sans-700.3c2edc9b.woff2chess-sans-700.3c2edc9b... https://www.chess.com/bundles/web/fonts/chess-sans/chess-sans-700.3c2edc9b.woff2 — 59.8 KiB — 113 ms — font-display: swaphttps://www.chess.com/bundles/web/fonts/chess-sans/chess-sans-800.9f4a2f62.woff2chess-sans-800.9f4a2f62... https://www.chess.com/bundles/web/fonts/chess-sans/chess-sans-800.9f4a2f62.woff2 — 59.8 KiB — 135 ms — font-display: swap
chessglyph-v3.3e78f81f.... woff2 swap
Size 67 KB
Load time 138 ms
Start 358 ms
Risk FOUT — text flashes from fallback to web font
chess-sans-700.3c2edc9b... woff2 swap
Size 60 KB
Load time 113 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
chess-sans-800.9f4a2f62... woff2 swap
Size 60 KB
Load time 135 ms
Start 359 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
2
preload
3
dns-prefetch
—
prefetch
—

5 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
124 requests over 4069ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s FCP 7.7 s LCP 21.0 shttps://chess.com// https://chess.com/ — 301 — 647 B — 22 ms — h3https://www.chess.com/www.chess.com/ https://www.chess.com/ — 200 — 26.9 KiB — 300 ms — h3https://www.chess.com/bundles/app/css/design-system.client.f032967f.csswww.chess.com/bundles/app/css/desig... https://www.chess.com/bundles/app/css/design-system.client.f032967f.css — 200 — 14.5 KiB — 26 ms — h3https://www.chess.com/bundles/app/css/main.client.c41017ab.csswww.chess.com/bundles/app/css/main.... https://www.chess.com/bundles/app/css/main.client.c41017ab.css — 200 — 13.8 KiB — 50 ms — h3https://www.chess.com/bundles/app/css/global.client.68b5e76f.csswww.chess.com/bundles/app/css/globa... https://www.chess.com/bundles/app/css/global.client.68b5e76f.css — 200 — 676 B — 53 ms — h3https://www.chess.com/bundles/app/css/navigation-footer.client.e665d0a1.csswww.chess.com/bundles/app/css/navig... https://www.chess.com/bundles/app/css/navigation-footer.client.e665d0a1.css — 200 — 2.5 KiB — 58 ms — h3https://www.chess.com/bundles/app/css/layout.client.e6cf3206.csswww.chess.com/bundles/app/css/layou... https://www.chess.com/bundles/app/css/layout.client.e6cf3206.css — 200 — 877 B — 65 ms — h3https://www.chess.com/bundles/app/css/index.client.9990e3d6.csswww.chess.com/bundles/app/css/index... https://www.chess.com/bundles/app/css/index.client.9990e3d6.css — 200 — 2.2 KiB — 61 ms — h3https://www.chess.com/bundles/app/css/landing-page.client.97c52e70.csswww.chess.com/bundles/app/css/landi... https://www.chess.com/bundles/app/css/landing-page.client.97c52e70.css — 200 — 3.5 KiB — 67 ms — h3https://www.chess.com/bundles/web/fonts/chessglyph-v3/chessglyph-v3.3e78f81f.woff2www.chess.com/bundles/web/fonts/che... https://www.chess.com/bundles/web/fonts/chessglyph-v3/chessglyph-v3.3e78f81f.woff2 — 200 — 67.4 KiB — 138 ms — h3https://www.chess.com/bundles/web/fonts/chess-sans/chess-sans-700.3c2edc9b.woff2www.chess.com/bundles/web/fonts/che... https://www.chess.com/bundles/web/fonts/chess-sans/chess-sans-700.3c2edc9b.woff2 — 200 — 59.8 KiB — 113 ms — h3https://www.chess.com/bundles/web/fonts/chess-sans/chess-sans-800.9f4a2f62.woff2www.chess.com/bundles/web/fonts/che... https://www.chess.com/bundles/web/fonts/chess-sans/chess-sans-800.9f4a2f62.woff2 — 200 — 59.8 KiB — 135 ms — h3https://www.chess.com/bundles/app/vite/sprites-global-styles.DdqrBI4Lhc.csswww.chess.com/bundles/app/vite/spri... https://www.chess.com/bundles/app/vite/sprites-global-styles.DdqrBI4Lhc.css — 200 — 4.2 KiB — 58 ms — h3https://www.chess.com/bundles/app/vite/common.C-nkLpxYjb.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.C-nkLpxYjb.chunk.js — 200 — 630 B — 158 ms — h3https://www.chess.com/bundles/app/vite/rolldown-runtime.D8Iw8soWI0.chunk.jswww.chess.com/bundles/app/vite/roll... https://www.chess.com/bundles/app/vite/rolldown-runtime.D8Iw8soWI0.chunk.js — 200 — 588 B — 158 ms — h3https://www.chess.com/bundles/app/vite/common.BxkWB1R-6X.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.BxkWB1R-6X.chunk.js — 200 — 633 B — 158 ms — h3https://www.chess.com/bundles/app/vite/navigation-global-styles.tDEySEdWu0.csswww.chess.com/bundles/app/vite/navi... https://www.chess.com/bundles/app/vite/navigation-global-styles.tDEySEdWu0.css — 200 — 4.9 KiB — 59 ms — h3https://www.chess.com/bundles/app/vite/common.BOMnQFRB9M.csswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.BOMnQFRB9M.css — 200 — 2.2 KiB — 65 ms — h3https://www.chess.com/bundles/app/vite/common.CBAHqPT0WD.csswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.CBAHqPT0WD.css — 200 — 1.2 KiB — 69 ms — h3https://www.chess.com/bundles/app/vite/common.BWsl97BVS5.csswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.BWsl97BVS5.css — 200 — 1.1 KiB — 73 ms — h3https://www.chess.com/bundles/app/vite/common.Bqr9xl7ZzD.csswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.Bqr9xl7ZzD.css — 200 — 2.6 KiB — 75 ms — h3https://www.chess.com/bundles/app/vite/common.BMS34xsG_l.csswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.BMS34xsG_l.css — 200 — 1.3 KiB — 79 ms — h3https://www.chess.com/bundles/app/vite/common.BJosL-lxOz.csswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.BJosL-lxOz.css — 200 — 5.8 KiB — 82 ms — h3https://www.chess.com/bundles/app/vite/common.Dznmi7HDZK.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.Dznmi7HDZK.chunk.js — 200 — 45.9 KiB — 163 ms — h3https://www.chess.com/bundles/app/vite/common.CU56V2vYRa.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.CU56V2vYRa.chunk.js — 200 — 43.7 KiB — 171 ms — h3https://www.chess.com/bundles/app/vite/common.DKHJa9FTL2.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.DKHJa9FTL2.chunk.js — 200 — 39.9 KiB — 173 ms — h3https://www.chess.com/bundles/app/vite/common.Czh7794SLH.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.Czh7794SLH.chunk.js — 200 — 43.2 KiB — 183 ms — h3https://www.chess.com/bundles/app/vite/common.tY1Mj-fRA0.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.tY1Mj-fRA0.chunk.js — 200 — 43.3 KiB — 207 ms — h3https://www.chess.com/bundles/app/vite/common.w3BB85233f.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.w3BB85233f.chunk.js — 200 — 42.2 KiB — 194 ms — h3https://www.chess.com/bundles/app/vite/common.CQsxXSXElz.chunk.jswww.chess.com/bundles/app/vite/comm... https://www.chess.com/bundles/app/vite/common.CQsxXSXElz.chunk.js — 200 — 37.3 KiB — 195 ms — h3
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https://www.chess.com/bundles/app/js/web.chunk.client.47835d1f.js — 200 — 1.8 KiB — 34 ms — h3https://www.chess.com/bundles/web/favicons/favicon.5d6cb047.svgwww.chess.com/bundles/web/favicons/... https://www.chess.com/bundles/web/favicons/favicon.5d6cb047.svg — 200 — 1.4 KiB — 30 ms — h3https://www.chess.com/bundles/web/favicons/android-chrome-144x144.090f49e5.pngwww.chess.com/bundles/web/favicons/... https://www.chess.com/bundles/web/favicons/android-chrome-144x144.090f49e5.png — 200 — 2.2 KiB — 27 ms — h3https://www.chess.com/bundles/app/vite/coaches.DrrQXMapbP.chunk.jswww.chess.com/bundles/app/vite/coac... https://www.chess.com/bundles/app/vite/coaches.DrrQXMapbP.chunk.js — 200 — 621 B — 19 ms — h3https://images.chesscomfiles.com/uploads/v1/event/5c4133c0-25e7-11f1-b51f-d9704b48d5ba-2.0422addb.320x180o.f9a509c57139.jpgimages.chesscomfiles.com/uploads/v1... https://images.chesscomfiles.com/uploads/v1/event/5c4133c0-25e7-11f1-b51f-d9704b48d5ba-2.0422addb.320x180o.f9a509c57139.jpg — 200 — 9.8 KiB — 36 ms — h3https://images.chesscomfiles.com/uploads/v1/event_index/fc1c5764-cf87-11f0-a5ed-391ac95618e3-1.b81a7521.320x180o.83877659ac87.pngimages.chesscomfiles.com/uploads/v1... https://images.chesscomfiles.com/uploads/v1/event_index/fc1c5764-cf87-11f0-a5ed-391ac95618e3-1.b81a7521.320x180o.83877659ac87.png — 200 — 7.7 KiB — 27 ms — h3https://images.chesscomfiles.com/uploads/v1/event_index/76b2af46-e4eb-11f0-b982-37ce407d3a67-1.9c3b236b.320x180o.84a7523a38a6.pngimages.chesscomfiles.com/uploads/v1... https://images.chesscomfiles.com/uploads/v1/event_index/76b2af46-e4eb-11f0-b982-37ce407d3a67-1.9c3b236b.320x180o.84a7523a38a6.png — 200 — 9.3 KiB — 36 ms — h3https://www.chess.com/bundles/app/vite/esm.CeWW-lTkly.chunk.jswww.chess.com/bundles/app/vite/esm.... https://www.chess.com/bundles/app/vite/esm.CeWW-lTkly.chunk.js — 200 — 2.3 KiB — 24 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.e3442523.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.e3442523.js — 200 — 10.2 KiB — 52 ms — h3https://www.chess.com/bundles/app/css/global-page-startup-client.chunk.client.fd28f901.csswww.chess.com/bundles/app/css/globa... https://www.chess.com/bundles/app/css/global-page-startup-client.chunk.client.fd28f901.css — 200 — 785 B — 14 ms — h3https://www.chess.com/bundles/app/js/global-page-startup-client.chunk.client.e01d05c7.jswww.chess.com/bundles/app/js/global... https://www.chess.com/bundles/app/js/global-page-startup-client.chunk.client.e01d05c7.js — 200 — 8.3 KiB — 41 ms — h3https://www.chess.com/bundles/app/js/language-banner-loader.client.dd877c92.jswww.chess.com/bundles/app/js/langua... https://www.chess.com/bundles/app/js/language-banner-loader.client.dd877c92.js — 200 — 33.7 KiB — 53 ms — h3https://www.chess.com/bundles/app/js/ui-fragments.client.3a5b2a8e.jswww.chess.com/bundles/app/js/ui-fra... https://www.chess.com/bundles/app/js/ui-fragments.client.3a5b2a8e.js — 200 — 16.0 KiB — 39 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.3e4c0062.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.3e4c0062.js — 200 — 7.7 KiB — 49 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.db655030.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.db655030.js — 200 — 95.8 KiB — 78 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.ccdbdf2b.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.ccdbdf2b.js — 200 — 8.4 KiB — 66 ms — h3https://www.chess.com/bundles/app/js/global-user-popover-client.chunk.client.b141f14a.jswww.chess.com/bundles/app/js/global... https://www.chess.com/bundles/app/js/global-user-popover-client.chunk.client.b141f14a.js — 200 — 4.0 KiB — 69 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.c6fe4cfc.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.c6fe4cfc.js — 200 — 4.1 KiB — 68 ms — h3https://www.chess.com/callback/bucketwww.chess.com/callback/bucket https://www.chess.com/callback/bucket — 404 — 783 B — 169 ms — h3https://www.chess.com/bundles/web/favicons/favicon-32x32.adae7142.pngwww.chess.com/bundles/web/favicons/... https://www.chess.com/bundles/web/favicons/favicon-32x32.adae7142.png — 200 — 1.2 KiB — 30 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.3803acc9.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.3803acc9.js — 200 — 27.4 KiB — 40 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.873061b6.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.873061b6.js — 200 — 5.7 KiB — 38 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.c6ae8c69.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.c6ae8c69.js — 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— 0 B — 214 ms — h3https://www.chess.com/bundles/web/favicons/favicon.46041f2d.icowww.chess.com/bundles/web/favicons/... https://www.chess.com/bundles/web/favicons/favicon.46041f2d.ico — 200 — 3.4 KiB — 22 ms — h3https://api.chess.com/rpc/chesscom.coaches.v2.CoachesService/GetCurrentCoachapi.chess.com/rpc/chesscom.coaches.... https://api.chess.com/rpc/chesscom.coaches.v2.CoachesService/GetCurrentCoach — 200 — 1.6 KiB — 200 ms — h3https://www.chess.com/bundles/web/images/glyphs/mark-cross.svgwww.chess.com/bundles/web/images/gl... https://www.chess.com/bundles/web/images/glyphs/mark-cross.svg — 200 — 885 B — 38 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.7a89c2fb.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.7a89c2fb.js — 200 — 743 B — 19 ms — h3https://www.chess.com/bundles/web/images/brand/smart-app-banner-icon.03c2b80c.svgwww.chess.com/bundles/web/images/br... https://www.chess.com/bundles/web/images/brand/smart-app-banner-icon.03c2b80c.svg — 200 — 1.5 KiB — 36 ms — h3https://www.chess.com/bundles/app/js/web.chunk.client.cc4f64ab.jswww.chess.com/bundles/app/js/web.ch... https://www.chess.com/bundles/app/js/web.chunk.client.cc4f64ab.js — 200 — 105.6 KiB — 31 ms — h3https://www.chess.com/service/user-activity/chesscom.user_activity.v1.UserActivityHttpBridgeService/DispatchEventBatchwww.chess.com/service/user-activity... https://www.chess.com/service/user-activity/chesscom.user_activity.v1.UserActivityHttpBridgeService/DispatchEventBatch — 200 — 672 B — 182 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 7016ms · 858KB · $121/mo
Unattributable
Other
Costly
Execution 2441ms
Transfer 0 KB
Monthly Cost $42/mo
www.chess.com
Other
Costly
Execution 1019ms
Transfer 27 KB
Monthly Cost $18/mo
www.chess.com
Other
Costly
Execution 995ms
Transfer 46 KB
Monthly Cost $17/mo
www.chess.com
Other
Costly
Execution 471ms
Transfer 96 KB
Monthly Cost $8/mo
www.chess.com
Other
Costly
Execution 377ms
Transfer 25 KB
Monthly Cost $6/mo
www.chess.com
Other
Costly
Execution 288ms
Transfer 29 KB
Monthly Cost $5/mo
www.chess.com
Other
Optional
Execution 195ms
Transfer 51 KB
Monthly Cost $3/mo
www.chess.com
Other
Optional
Execution 169ms
Transfer 77 KB
Unused 75%
Monthly Cost $3/mo
www.chess.com
Other
Optional
Execution 162ms
Transfer 7 KB
Monthly Cost $3/mo
www.chess.com
Other
Optional
Execution 146ms
Transfer 13 KB
Monthly Cost $3/mo
www.chess.com
Other
Optional
Execution 135ms
Transfer 213 KB
Unused 72%
Monthly Cost $2/mo
www.chess.com
Other
Optional
Execution 122ms
Transfer 106 KB
Unused 94%
Monthly Cost $2/mo
www.chess.com
Other
Optional
Execution 111ms
Transfer 34 KB
Monthly Cost $2/mo
www.chess.com
Other
Optional
Execution 110ms
Transfer 106 KB
Unused 94%
Monthly Cost $2/mo
www.chess.com
Other
Optional
Execution 95ms
Transfer 16 KB
Monthly Cost $2/mo
www.chess.com
Other
Optional
Execution 91ms
Transfer 10 KB
Monthly Cost $2/mo
www.chess.com
Other
Optional
Execution 88ms
Transfer 2 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 2441ms and costs ~$42/month
  • www.chess.com adds 1019ms and costs ~$18/month
  • www.chess.com adds 995ms and costs ~$17/month
  • www.chess.com adds 471ms and costs ~$8/month
  • www.chess.com adds 377ms and costs ~$6/month
  • www.chess.com adds 288ms and costs ~$5/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 2441ms 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.chess.com takes 1019ms 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.chess.com takes 995ms 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.chess.com takes 471ms 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.chess.com takes 377ms 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.chess.com takes 288ms 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

75% of www.chess.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

72% of www.chess.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

94% of www.chess.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

94% of www.chess.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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