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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
53
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

1.95 s

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

4.25 s

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

342 ms

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.

1.95 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.

4.72 s

Page Load Progression

593 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.1 s
4.7 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.8 MB transferred, 120 requests
FIX
4.8 MB transferred, 120 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::
120 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
120 requests
1.0 g CO2 per page load
Images 2.8 MiB 58%
JavaScript 1.8 MiB 37%
Fonts 187.0 KiB 4%
CSS 36.0 KiB 1%
HTML 27.3 KiB 1%
Other 9.1 KiB 0%
Other 5.9 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 Bundles
Action
60 scripts, 584 KB unused
FIX
60 scripts, 584 KB unused
Warning::
https://www.chess.com/bundles/app/js/vue.dll.c1ed7...: 163 KB unused (77%)
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: 584 KB
584 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.chess.com/bundles/app/js/vue.dll.c1ed70f2.js213 KB163 KB (77%)✓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 KB27 KB (60%)✓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
120 resources · 4.8 MB · 584 KB savings available
FIX
120 resources · 4.8 MB · 584 KB savings available
Warning::
Page weight 3.8 MB over 1MB target
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~584 KB of savings available
Warning::
119 third-party resources (100% of weight)
Info::
2 resources over 200KB
120 resources · 4.8 MiB · 119 third-party 3.8 MiB over 1MB target
Image 58% · 2.8 MiB
JavaScript 37% · 1.8 MiB
Font 4% · 187.0 KiB
CSS 1% · 36.0 KiB
Document 1% · 27.3 KiB
Other 0% · 8.9 KiB

~583.7 KiB of savings available

Remove unused JavaScript: 583.7 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
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Info::
All images are well-optimized
22 images 2.8 MB
0 oversized -0 KB
16 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1303ms total JS execution
REVIEW
1303ms total JS execution
Warning::
Unattributable: 566ms CPU time
Info::
https://www.chess.com/bundles/app/vite/common.Dznm...: 236ms CPU time
Info::
https://www.chess.com/: 197ms CPU time
Info::
https://www.chess.com/bundles/app/js/web.chunk.cli...: 125ms CPU time
Info::
https://www.chess.com/bundles/app/js/sentry.client...: 65ms CPU time
Warning::
Third-party scripts: 1303ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 28% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
Unattributable566ms167ms0ms3rd
https://www.chess.com/bundles/app/vite/common.Dznmi7HDZK.chunk.js236ms213ms0ms3rd
https://www.chess.com/197ms11ms9ms3rd
https://www.chess.com/bundles/app/js/web.chunk.client.db655030.js125ms96ms16ms3rd
https://www.chess.com/bundles/app/js/sentry.client.ab73093b.js65ms52ms4ms3rd
https://www.chess.com/bundles/app/js/global-app-init.chunk.client.e02dc005.js64ms60ms4ms3rd
https://www.chess.com/bundles/app/js/index.client.644c35a4.js51ms42ms8ms3rd
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 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.0 s LCP 4.3 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 — 187 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 — 188 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 — 190 ms — font-display: swap
chessglyph-v3.3e78f81f.... woff2 swap
Size 67 KB
Load time 187 ms
Start 304 ms
Risk FOUT — text flashes from fallback to web font
chess-sans-700.3c2edc9b... woff2 swap
Size 60 KB
Load time 188 ms
Start 306 ms
Risk FOUT — text flashes from fallback to web font
chess-sans-800.9f4a2f62... woff2 swap
Size 60 KB
Load time 190 ms
Start 306 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
120 requests over 3993ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.0 s LCP 4.3 shttps://chess.com// https://chess.com/ — 301 — 640 B — 15 ms — h3https://www.chess.com/www.chess.com/ https://www.chess.com/ — 200 — 27.3 KiB — 273 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 — 0 B — 56 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 — 0 B — 88 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 — 0 B — 120 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 — 0 B — 120 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 — 0 B — 120 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 — 0 B — 120 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 — 0 B — 120 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 — 187 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 — 188 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 — 190 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 — 36 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 — 628 B — 82 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 — 595 B — 116 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 — 626 B — 116 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 — 38 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 — 42 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 — 55 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 — 51 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 — 60 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 — 56 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 — 61 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 — 183 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 — 219 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 — 228 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 — 195 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 — 195 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 — 198 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 — 202 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.0 s LCP 4.3 shttps://chess.com// https://chess.com/ — 301 — 640 B — 15 ms — h3https://www.chess.com/www.chess.com/ https://www.chess.com/ — 200 — 27.3 KiB — 273 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 — 0 B — 56 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 — 0 B — 88 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 — 0 B — 120 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 — 0 B — 120 ms 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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 1303ms · 275KB · $23/mo
Unattributable
Other
Costly
Execution 566ms
Transfer 0 KB
Monthly Cost $10/mo
www.chess.com
Other
Costly
Execution 236ms
Transfer 46 KB
Monthly Cost $4/mo
www.chess.com
Other
Optional
Execution 197ms
Transfer 27 KB
Monthly Cost $3/mo
www.chess.com
Other
Optional
Execution 125ms
Transfer 96 KB
Monthly Cost $2/mo
www.chess.com
Other
Optional
Execution 65ms
Transfer 29 KB
Monthly Cost $1/mo
www.chess.com
Other
Optional
Execution 64ms
Transfer 25 KB
Monthly Cost $1/mo
www.chess.com
Other
Optional
Execution 51ms
Transfer 51 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 566ms and costs ~$10/month
  • www.chess.com adds 236ms 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

Unattributable takes 566ms 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 236ms 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

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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