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https://web.whatsapp.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
58
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
58
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.

6.80 s

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

7.85 s

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

10 ms

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

0.080

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

6.80 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.

7.85 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 3 REVIEW 4 FIX
D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (1.2 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
F
JS Bundles
Action
20 scripts, 640 KB unused
FIX
20 scripts, 640 KB unused
Warning::
https://static.whatsapp.net/rsrc.php/v4/yS/r/DXGWA...: 242 KB unused (97%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.whatsapp.net/rsrc.php/v4iSfE4/y0/l/...: 125 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.whatsapp.net/rsrc.php/v4/yJ/r/Wl_HC...: 123 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.whatsapp.net/rsrc.php/v4/yV/r/ce-O1...: 45 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.whatsapp.net/rsrc.php/v4/yP/r/TmE3j...: 43 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 640 KB
640 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.whatsapp.net/rsrc.php/v4/yS/r/DXGWA68xwJZ.js249 KB242 KB (97%)✓3rd
https://static.whatsapp.net/rsrc.php/v4iSfE4/y0/l/en_GB-j/1YNmnQSA7gy.js142 KB125 KB (88%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yJ/r/Wl_HC4ZDPfu.js124 KB123 KB (99%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yV/r/ce-O1eEeZ9o.js78 KB45 KB (58%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yP/r/TmE3jnttQmq.js83 KB43 KB (52%)✓3rd
https://static.whatsapp.net/rsrc.php/v4ijFT4/yf/l/en_GB-j/dl1FlK37LML.js40 KB36 KB (89%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yy/r/Owo1GF5ZPg0.js27 KB27 KB (98%)✓3rd
data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCl9fYW5ub3RhdG9yPWZ1bmN…0 KB—✓3rd
https://static.whatsapp.net/rsrc.php/v4/yn/r/CC44i2tgXly.js33 KB—✓3rd
data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCnZhciBkYXRhRWxlbWVudD1…0 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

D
Page Weight Inventory
Action
26 resources · 1.2 MB · 640 KB savings available
FIX
26 resources · 1.2 MB · 640 KB savings available
Warning::
Page weight 221 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~640 KB of savings available
Warning::
24 third-party resources (99% of weight)
Info::
2 resources over 200KB
26 resources · 1.2 MiB · 24 third-party 221.2 KiB over 1MB target
JavaScript 70% · 872.6 KiB
CSS 19% · 236.8 KiB
Other 8% · 104.9 KiB
Document 1% · 17.0 KiB
Image 1% · 14.0 KiB

~639.7 KiB of savings available

Remove unused JavaScript: 639.7 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-cache, no-store, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
must-revalidate—Must recheck with server after expiry
B
Page Weight Budget
1.2 MB transferred, 26 requests
REVIEW
1.2 MB transferred, 26 requests
Info::
Page weighs 4.5 MB (1.2 MB transferred)
Warning::
JavaScript is 873 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 873 KB
Info::
CSS is 237 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 237 KB
Info::
26 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
26 requests
0.26 g CO2 per page load
JavaScript 872.6 KiB 70%
CSS 236.8 KiB 19%
Other 104.9 KiB 8%
HTML 16.3 KiB 1%
Images 10.3 KiB 1%
Other 4.4 KiB 0%
0 2.4 MB 4.9 MB
Under 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

B
JS Execution Cost
658ms total JS execution
REVIEW
658ms total JS execution
Warning::
https://static.whatsapp.net/rsrc.php/v4/yV/r/ce-O1...: 253ms CPU time
Info::
Unattributable: 153ms CPU time
Info::
https://web.whatsapp.com/mobile/: 118ms CPU time
Info::
https://static.whatsapp.net/rsrc.php/v4/yS/r/DXGWA...: 76ms CPU time
Info::
https://static.whatsapp.net/rsrc.php/v4iSfE4/y0/l/...: 59ms CPU time
Warning::
Third-party scripts: 541ms (82% of total)

Main Thread Breakdown

Script Parsing & Compilation 33% Script Evaluation 30% Other 22% Style & Layout 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://static.whatsapp.net/rsrc.php/v4/yV/r/ce-O1eEeZ9o.js253ms191ms29ms3rd
Unattributable153ms5ms0ms3rd
https://web.whatsapp.com/mobile/118ms15ms0ms1st
https://static.whatsapp.net/rsrc.php/v4/yS/r/DXGWA68xwJZ.js76ms6ms70ms3rd
https://static.whatsapp.net/rsrc.php/v4iSfE4/y0/l/en_GB-j/1YNmnQSA7gy.js59ms6ms54ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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+
Image Optimization
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Warning::
https://static.whatsapp.net/rsrc.php/yu/r/3IkZnQ5T... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
1 images 10 KB
0 oversized -0 KB
0 legacy format
1 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

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
9 hints, 0 missing preconnects
PASS
9 hints, 0 missing preconnects
Info::
Page uses 9 resource hint(s)

Current Resource Hints

preconnect
—
preload
9
dns-prefetch
—
prefetch
—

9 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
Network Waterfall
26 requests over 686ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 6.8 s LCP 7.9 shttps://web.whatsapp.com// https://web.whatsapp.com/ — 302 — 723 B — 153 ms — h2https://web.whatsapp.com/mobile//mobile/ https://web.whatsapp.com/mobile/ — 200 — 16.3 KiB — 139 ms — h2https://static.whatsapp.net/rsrc.php/v5/ya/l/0,cross/b8XlL3jdSUdA7PQro9bG3Rlwij8nbyzl0.cssstatic.whatsapp.net/rsrc.php/v5/ya/... https://static.whatsapp.net/rsrc.php/v5/ya/l/0,cross/b8XlL3jdSUdA7PQro9bG3Rlwij8nbyzl0.css — 200 — 236.8 KiB — 179 ms — h2https://static.whatsapp.net/rsrc.php/v4/yV/r/ce-O1eEeZ9o.jsstatic.whatsapp.net/rsrc.php/v4/yV/... https://static.whatsapp.net/rsrc.php/v4/yV/r/ce-O1eEeZ9o.js — 200 — 77.9 KiB — 163 ms — h2https://static.whatsapp.net/rsrc.php/v4/yP/r/TmE3jnttQmq.jsstatic.whatsapp.net/rsrc.php/v4/yP/... https://static.whatsapp.net/rsrc.php/v4/yP/r/TmE3jnttQmq.js — 200 — 83.3 KiB — 162 ms — h2https://static.whatsapp.net/rsrc.php/v4iG_L4/yg/l/en_GB-j/PbjCpseDapU7kXmm5Y1-1cN2BaG9ISuhoe0qnL2dG90HwJ34wthXfB3u63lw_MkRQA.jsstatic.whatsapp.net/rsrc.php/v4iG_L... https://static.whatsapp.net/rsrc.php/v4iG_L4/yg/l/en_GB-j/PbjCpseDapU7kXmm5Y1-1cN2BaG9ISuhoe0qnL2dG90HwJ34wthXfB3u63lw_MkRQA.js — 200 — 17.7 KiB — 138 ms — h2https://static.whatsapp.net/rsrc.php/v4/yy/r/_mrt6svGwY_.jsstatic.whatsapp.net/rsrc.php/v4/yy/... https://static.whatsapp.net/rsrc.php/v4/yy/r/_mrt6svGwY_.js — 200 — 28.4 KiB — 100 ms — h2https://static.whatsapp.net/rsrc.php/v4/yX/r/OmHs77wjK-NGSdHeMgZ91IoURUr9K2ba4CsviLnUnBmUdf-K6dZS2nKuIQyB6E1_DnwCd1xqrhA4llWiQ4E6-9Al.jsstatic.whatsapp.net/rsrc.php/v4/yX/... https://static.whatsapp.net/rsrc.php/v4/yX/r/OmHs77wjK-NGSdHeMgZ91IoURUr9K2ba4CsviLnUnBmUdf-K6dZS2nKuIQyB6E1_DnwCd1xqrhA4llWiQ4E6-9Al.js — 200 — 26.6 KiB — 117 ms — h2https://static.whatsapp.net/rsrc.php/v4/yS/r/DXGWA68xwJZ.jsstatic.whatsapp.net/rsrc.php/v4/yS/... https://static.whatsapp.net/rsrc.php/v4/yS/r/DXGWA68xwJZ.js — 200 — 249.2 KiB — 176 ms — h2https://static.whatsapp.net/rsrc.php/v4/yy/r/Owo1GF5ZPg0.jsstatic.whatsapp.net/rsrc.php/v4/yy/... https://static.whatsapp.net/rsrc.php/v4/yy/r/Owo1GF5ZPg0.js — 200 — 27.5 KiB — 144 ms — h2https://static.whatsapp.net/rsrc.php/v4/yJ/r/Wl_HC4ZDPfu.jsstatic.whatsapp.net/rsrc.php/v4/yJ/... https://static.whatsapp.net/rsrc.php/v4/yJ/r/Wl_HC4ZDPfu.js — 200 — 124.3 KiB — 169 ms — h2https://static.whatsapp.net/rsrc.php/v4/yn/r/CC44i2tgXly.jsstatic.whatsapp.net/rsrc.php/v4/yn/... https://static.whatsapp.net/rsrc.php/v4/yn/r/CC44i2tgXly.js — 200 — 33.3 KiB — 125 ms — h2data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCnZhciBkYXRhRWxlbWVudD1…data:application/x-javascript; char... data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCnZhciBkYXRhRWxlbWVudD1… — 200 — 0 B — 0 ms — datadata:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCl9fYW5ub3RhdG9yPWZ1bmN…data:application/x-javascript; char... data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCl9fYW5ub3RhdG9yPWZ1bmN… — 200 — 0 B — 0 ms — datadata:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCl9idGxkcj17fSxfbm93SW5…data:application/x-javascript; char... data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCl9idGxkcj17fSxfbm93SW5… — 200 — 0 B — 0 ms — datadata:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCihmdW5jdGlvbigpe2Z1bmN…data:application/x-javascript; char... data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCihmdW5jdGlvbigpe2Z1bmN… — 200 — 0 B — 0 ms — datadata:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCiJ1c2Ugc3RyaWN0Ijt2YXI…data:application/x-javascript; char... data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCiJ1c2Ugc3RyaWN0Ijt2YXI… — 200 — 0 B — 0 ms — datadata:text/javascript;base64,cmVxdWlyZUxhenkoWyJTZXJ2ZXJKU1BheWxvYWRMaXN0ZW5lciJdLGZ1bmN0aW9uKG0pe20…data:text/javascript;base64,cmVxdWl... data:text/javascript;base64,cmVxdWlyZUxhenkoWyJTZXJ2ZXJKU1BheWxvYWRMaXN0ZW5lciJdLGZ1bmN0aW9uKG0pe20… — 200 — 0 B — 0 ms — datadata:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCl9fZCgiSW50bENMRFJOdW1…data:application/x-javascript; char... data:application/x-javascript; charset=utf-8;base64,Oy8qRkJfUEtHX0RFTElNKi8KCl9fZCgiSW50bENMRFJOdW1… — 200 — 0 B — 0 ms — datahttps://static.whatsapp.net/rsrc.php/v4iSfE4/y0/l/en_GB-j/1YNmnQSA7gy.jsstatic.whatsapp.net/rsrc.php/v4iSfE... https://static.whatsapp.net/rsrc.php/v4iSfE4/y0/l/en_GB-j/1YNmnQSA7gy.js — 200 — 141.6 KiB — 38 ms — h2https://static.whatsapp.net/rsrc.php/v4/yc/r/rBGl1VNl-DE.jsstatic.whatsapp.net/rsrc.php/v4/yc/... https://static.whatsapp.net/rsrc.php/v4/yc/r/rBGl1VNl-DE.js — 200 — 4.7 KiB — 29 ms — h2https://static.whatsapp.net/rsrc.php/v4ijFT4/yf/l/en_GB-j/dl1FlK37LML.jsstatic.whatsapp.net/rsrc.php/v4ijFT... https://static.whatsapp.net/rsrc.php/v4ijFT4/yf/l/en_GB-j/dl1FlK37LML.js — 200 — 40.3 KiB — 34 ms — h2https://static.whatsapp.net/rsrc.php/v4/yy/r/UuKeuprO5OH.jsstatic.whatsapp.net/rsrc.php/v4/yy/... https://static.whatsapp.net/rsrc.php/v4/yy/r/UuKeuprO5OH.js — 200 — 17.7 KiB — 20 ms — h2https://static.whatsapp.net/rsrc.php/yu/r/3IkZnQ5TIHA.webpstatic.whatsapp.net/rsrc.php/yu/r/3... https://static.whatsapp.net/rsrc.php/yu/r/3IkZnQ5TIHA.webp — 200 — 10.3 KiB — 41 ms — h3https://static.whatsapp.net/btmanifest/1037799039/whatsapp/mainstatic.whatsapp.net/btmanifest/1037... https://static.whatsapp.net/btmanifest/1037799039/whatsapp/main — 200 — 104.9 KiB — 44 ms — h3https://static.whatsapp.net/rsrc.php/yd/r/PfkSLByWV8O.webpstatic.whatsapp.net/rsrc.php/yd/r/P... https://static.whatsapp.net/rsrc.php/yd/r/PfkSLByWV8O.webp — 200 — 3.7 KiB — 19 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
82% of JavaScript execution is third-party
First-party Third-party 541ms · 469KB · $7/mo
static.whatsapp.net
Other
Costly
Execution 253ms
Transfer 78 KB
Unused 58%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 153ms
Transfer 0 KB
Monthly Cost $2/mo
static.whatsapp.net
Other
Optional
Execution 76ms
Transfer 249 KB
Unused 97%
Monthly Cost $1/mo
static.whatsapp.net
Other
Optional
Execution 59ms
Transfer 142 KB
Unused 88%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static.whatsapp.net adds 253ms and costs ~$3/month

82% 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

static.whatsapp.net takes 253ms 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

58% of static.whatsapp.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

97% of static.whatsapp.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

88% of static.whatsapp.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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