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https://web.whatsapp.com

Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
4
REVIEW
5
PASS
15
INFO
4

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.

7.78 s

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

8.36 s

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

0 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.

7.78 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.

8.36 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
28
15 PASS 5 REVIEW 4 FIX
D
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
JS Bundles
Action
23 scripts, 715 KB unused
FIX
23 scripts, 715 KB unused
Warning::
https://static.whatsapp.net/rsrc.php/v4iB2m4/yB/l/...: 154 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.whatsapp.net/rsrc.php/v4/yJ/r/5S6jq...: 146 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.whatsapp.net/rsrc.php/v4/yv/r/EH-Pq...: 66 KB unused (97%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.whatsapp.net/rsrc.php/v4is4J4/yp/l/...: 62 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.whatsapp.net/rsrc.php/v4/yg/r/0Dr5E...: 49 KB unused (91%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 715 KB
715 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.whatsapp.net/rsrc.php/v4iB2m4/yB/l/en_US-j/SdUoth8Y_UzhKFyYHJMOrqGkYs71Nq93UimXTyCTiBBuGUgBJSaveS-TfbLCHDWbK7hRgxME01XdEwOwYeYbBY18uGP9Ec6EO2ig7zQlmispEiiXl7v_kCWOuuYDUTLqI22QsbQzZpw3EfIEbPG_2iHZIBIxApzT7tDl6mhUXdHTpUbLypWGyW953KKtr9x9pi_sGqCf7zfN5YFoBjFvS-hhjSk-IkB67_ZKw9jNv46YQ2YP1PLoER_Y_tZYmCwamb14RsoK.js187 KB154 KB (83%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yJ/r/5S6jq-b22GM.js188 KB146 KB (78%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yv/r/EH-PqCGmG2M.js68 KB66 KB (97%)✓3rd
https://static.whatsapp.net/rsrc.php/v4is4J4/yp/l/en_US-j/tKYmjJ9T4Hc.js69 KB62 KB (90%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yg/r/0Dr5E4kn-fZ.js54 KB49 KB (91%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yA/r/yNZV7jdVFoC.js77 KB45 KB (59%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/yF/r/ODeFkUjI7ok.js80 KB40 KB (50%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/y3/r/6XAglkoVXjF.js38 KB35 KB (93%)✓3rd
https://static.whatsapp.net/rsrc.php/v4iDuD4/y5/l/en_US-j/5SP815S78jCffMxkTrwGIz2DoNJSuXYKce0qnL2dG90H.js41 KB34 KB (84%)✓3rd
https://static.whatsapp.net/rsrc.php/v4/y0/r/eDg9cFyXmNS.js48 KB33 KB (70%)✓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
30 resources · 1.5 MB · 715 KB savings available
FIX
30 resources · 1.5 MB · 715 KB savings available
Warning::
Page weight 1.5 MB exceeds 1 MB target by 543 KB
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~715 KB of savings available
Warning::
28 third-party resources (98% of weight)
Info::
1 resources over 200KB
30 resources · 1.5 MiB · 28 third-party 542.9 KiB over 1MB target
JavaScript 62% · 966.1 KiB
Font 13% · 204.7 KiB
CSS 12% · 188.2 KiB
Other 11% · 168.7 KiB
Document 2% · 25.2 KiB
Image 1% · 14.0 KiB

~715.0 KiB of savings available

Remove unused JavaScript: 715.0 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
1.5 MB transferred, 30 requests
REVIEW
1.5 MB transferred, 30 requests
Info::
Page weighs 5.5 MB (1.5 MB transferred)
Warning::
JavaScript is 966 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 966 KB
Info::
Fonts are 205 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 205 KB
Info::
30 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
30 requests
0.32 g CO2 per page load
JavaScript 966.1 KiB 62%
Fonts 204.7 KiB 13%
CSS 188.2 KiB 12%
Other 168.7 KiB 11%
HTML 24.4 KiB 2%
Images 10.3 KiB 1%
Other 4.5 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

C
JS Execution Cost
Action
1178ms total JS execution
REVIEW
1178ms total JS execution
Warning::
https://static.whatsapp.net/rsrc.php/v4/yA/r/yNZV7...: 429ms CPU time
Warning::
Unattributable: 264ms CPU time
Warning::
https://web.whatsapp.com/mobile/: 259ms CPU time
Info::
https://static.whatsapp.net/rsrc.php/v5/yd/l/0,cro...: 91ms CPU time
Info::
https://static.whatsapp.net/rsrc.php/v4/yJ/r/5S6jq...: 69ms CPU time
Warning::
Third-party scripts: 654ms (56% of total)

Main Thread Breakdown

Script Evaluation 30% Script Parsing & Compilation 27% Other 24% Style & Layout 11% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://static.whatsapp.net/rsrc.php/v4/yA/r/yNZV7jdVFoC.js429ms369ms26ms3rd
Unattributable264ms6ms0ms1st
https://web.whatsapp.com/mobile/259ms17ms1ms1st
https://static.whatsapp.net/rsrc.php/v5/yd/l/0,cross/I3Bnu8ALToVKkmsA6qiUsNOB_OY8k1KqH.css91ms0ms0ms3rd
https://static.whatsapp.net/rsrc.php/v4/yJ/r/5S6jq-b22GM.js69ms2ms67ms3rd
https://static.whatsapp.net/rsrc.php/v4iB2m4/yB/l/en_US-j/SdUoth8Y_UzhKFyYHJMOrqGkYs71Nq93UimXTyCTiBBuGUgBJSaveS-TfbLCHDWbK7hRgxME01XdEwOwYeYbBY18uGP9Ec6EO2ig7zQlmispEiiXl7v_kCWOuuYDUTLqI22QsbQzZpw3EfIEbPG_2iHZIBIxApzT7tDl6mhUXdHTpUbLypWGyW953KKtr9x9pi_sGqCf7zfN5YFoBjFvS-hhjSk-IkB67_ZKw9jNv46YQ2YP1PLoER_Y_tZYmCwamb14RsoK.js64ms3ms61ms3rd
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
6 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
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
1 fonts (205 KB)
PASS
1 fonts (205 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

205 KB total

Render-blocking

0

of 1

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 5.0 s 6.0 s 7.0 s 8.0 s FCP 7.8 s LCP 8.4 shttps://static.whatsapp.net/rsrc.php/yy/r/s3KknyKHL5v.woff2s3KknyKHL5v.woff2 https://static.whatsapp.net/rsrc.php/yy/r/s3KknyKHL5v.woff2 — 204.7 KiB — 62 ms — font-display: swap
s3KknyKHL5v.woff2 woff2 swap
Size 205 KB
Load time 62 ms
Start 911 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)

Fixing the unchecked items could save ~102 KB and ~204 ms

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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
static.whatsapp.net serves assets with brotli (assets: 13)
Got: static.whatsapp.net (text/css)
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-cache, no-store, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding, User-Agent, Accept-Language
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall
30 requests over 1011ms
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 7.8 s LCP 8.4 shttps://web.whatsapp.com// https://web.whatsapp.com/ — 302 — 859 B — 196 ms — h2https://web.whatsapp.com/mobile//mobile/ https://web.whatsapp.com/mobile/ — 200 — 24.4 KiB — 252 ms — h2https://static.whatsapp.net/rsrc.php/v5/yd/l/0,cross/I3Bnu8ALToVKkmsA6qiUsNOB_OY8k1KqH.cssstatic.whatsapp.net/rsrc.php/v5/yd/... https://static.whatsapp.net/rsrc.php/v5/yd/l/0,cross/I3Bnu8ALToVKkmsA6qiUsNOB_OY8k1KqH.css — 200 — 188.2 KiB — 202 ms — h2https://static.whatsapp.net/rsrc.php/v4/yA/r/yNZV7jdVFoC.jsstatic.whatsapp.net/rsrc.php/v4/yA/... https://static.whatsapp.net/rsrc.php/v4/yA/r/yNZV7jdVFoC.js — 200 — 76.9 KiB — 194 ms — h2https://static.whatsapp.net/rsrc.php/v4iDuD4/y5/l/en_US-j/5SP815S78jCffMxkTrwGIz2DoNJSuXYKce0qnL2dG90H.jsstatic.whatsapp.net/rsrc.php/v4iDuD... https://static.whatsapp.net/rsrc.php/v4iDuD4/y5/l/en_US-j/5SP815S78jCffMxkTrwGIz2DoNJSuXYKce0qnL2dG90H.js — 200 — 40.6 KiB — 178 ms — h2https://static.whatsapp.net/rsrc.php/v4/y0/r/eDg9cFyXmNS.jsstatic.whatsapp.net/rsrc.php/v4/y0/... https://static.whatsapp.net/rsrc.php/v4/y0/r/eDg9cFyXmNS.js — 200 — 48.1 KiB — 130 ms — h2https://static.whatsapp.net/rsrc.php/v4/yF/r/ODeFkUjI7ok.jsstatic.whatsapp.net/rsrc.php/v4/yF/... https://static.whatsapp.net/rsrc.php/v4/yF/r/ODeFkUjI7ok.js — 200 — 80.0 KiB — 183 ms — h2https://static.whatsapp.net/rsrc.php/v4iB2m4/yB/l/en_US-j/SdUoth8Y_UzhKFyYHJMOrqGkYs71Nq93UimXTyCTiBBuGUgBJSaveS-TfbLCHDWbK7hRgxME01XdEwOwYeYbBY18uGP9Ec6EO2ig7zQlmispEiiXl7v_kCWOuuYDUTLqI22QsbQzZpw3EfIEbPG_2iHZIBIxApzT7tDl6mhUXdHTpUbLypWGyW953KKtr9x9pi_sGqCf7zfN5YFoBjFvS-hhjSk-IkB67_ZKw9jNv46YQ2YP1PLoER_Y_tZYmCwamb14RsoK.jsstatic.whatsapp.net/rsrc.php/v4iB2m... https://static.whatsapp.net/rsrc.php/v4iB2m4/yB/l/en_US-j/SdUoth8Y_UzhKFyYHJMOrqGkYs71Nq93UimXTyCTiBBuGUgBJSaveS-TfbLCHDWbK7hRgxME01XdEwOwYeYbBY18uGP9Ec6EO2ig7zQlmispEiiXl7v_kCWOuuYDUTLqI22QsbQzZpw3EfIEbPG_2iHZIBIxApzT7tDl6mhUXdHTpUbLypWGyW953KKtr9x9pi_sGqCf7zfN5YFoBjFvS-hhjSk-IkB67_ZKw9jNv46YQ2YP1PLoER_Y_tZYmCwamb14RsoK.js — 200 — 187.3 KiB — 200 ms — h2https://static.whatsapp.net/rsrc.php/v4is4J4/yp/l/en_US-j/tKYmjJ9T4Hc.jsstatic.whatsapp.net/rsrc.php/v4is4J... https://static.whatsapp.net/rsrc.php/v4is4J4/yp/l/en_US-j/tKYmjJ9T4Hc.js — 200 — 69.2 KiB — 186 ms — h2https://static.whatsapp.net/rsrc.php/v4/yJ/r/5S6jq-b22GM.jsstatic.whatsapp.net/rsrc.php/v4/yJ/... https://static.whatsapp.net/rsrc.php/v4/yJ/r/5S6jq-b22GM.js — 200 — 188.5 KiB — 201 ms — h2https://static.whatsapp.net/rsrc.php/v4/yv/r/EH-PqCGmG2M.jsstatic.whatsapp.net/rsrc.php/v4/yv/... https://static.whatsapp.net/rsrc.php/v4/yv/r/EH-PqCGmG2M.js — 200 — 68.1 KiB — 188 ms — h2https://static.whatsapp.net/rsrc.php/v4/yg/r/0Dr5E4kn-fZ.jsstatic.whatsapp.net/rsrc.php/v4/yg/... https://static.whatsapp.net/rsrc.php/v4/yg/r/0Dr5E4kn-fZ.js — 200 — 54.2 KiB — 169 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: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/v4/yO/r/nRGUWhxOjPu.jsstatic.whatsapp.net/rsrc.php/v4/yO/... https://static.whatsapp.net/rsrc.php/v4/yO/r/nRGUWhxOjPu.js — 200 — 9.0 KiB — 42 ms — h2https://static.whatsapp.net/rsrc.php/v4/y1/r/-RjreKhhBH3.jsstatic.whatsapp.net/rsrc.php/v4/y1/... https://static.whatsapp.net/rsrc.php/v4/y1/r/-RjreKhhBH3.js — 200 — 33.9 KiB — 48 ms — h2https://static.whatsapp.net/rsrc.php/v4iJE64/yF/l/en_US-j/86zb2ICvGdm-n6gPcr3XClxsOzVRrXrg3sfzVFsEEHUzrO1GHH6N2XQso6pjbbzH2b.jsstatic.whatsapp.net/rsrc.php/v4iJE6... https://static.whatsapp.net/rsrc.php/v4iJE64/yF/l/en_US-j/86zb2ICvGdm-n6gPcr3XClxsOzVRrXrg3sfzVFsEEHUzrO1GHH6N2XQso6pjbbzH2b.js — 200 — 11.9 KiB — 38 ms — h2https://static.whatsapp.net/rsrc.php/v4idEz4/yE/l/en_US-j/wquzGkVT0XP.jsstatic.whatsapp.net/rsrc.php/v4idEz... https://static.whatsapp.net/rsrc.php/v4idEz4/yE/l/en_US-j/wquzGkVT0XP.js — 200 — 25.7 KiB — 36 ms — h2https://static.whatsapp.net/rsrc.php/v4/y3/r/6XAglkoVXjF.jsstatic.whatsapp.net/rsrc.php/v4/y3/... https://static.whatsapp.net/rsrc.php/v4/y3/r/6XAglkoVXjF.js — 200 — 38.0 KiB — 46 ms — h2https://static.whatsapp.net/rsrc.php/v4/yA/r/XCeRHSjJ3Xs.jsstatic.whatsapp.net/rsrc.php/v4/yA/... https://static.whatsapp.net/rsrc.php/v4/yA/r/XCeRHSjJ3Xs.js — 200 — 17.5 KiB — 36 ms — h2https://static.whatsapp.net/rsrc.php/v4/yK/r/OcvegDn2UeD.jsstatic.whatsapp.net/rsrc.php/v4/yK/... https://static.whatsapp.net/rsrc.php/v4/yK/r/OcvegDn2UeD.js — 200 — 11.8 KiB — 35 ms — h2https://static.whatsapp.net/rsrc.php/v4/y-/r/3eAfZ4uZlGx.jsstatic.whatsapp.net/rsrc.php/v4/y-/... https://static.whatsapp.net/rsrc.php/v4/y-/r/3eAfZ4uZlGx.js — 200 — 5.4 KiB — 44 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 — 46 ms — h3https://static.whatsapp.net/rsrc.php/yy/r/s3KknyKHL5v.woff2static.whatsapp.net/rsrc.php/yy/r/s... https://static.whatsapp.net/rsrc.php/yy/r/s3KknyKHL5v.woff2 — 200 — 204.7 KiB — 62 ms — h3https://static.whatsapp.net/btmanifest/1048249751/whatsapp/mainstatic.whatsapp.net/btmanifest/1048... https://static.whatsapp.net/btmanifest/1048249751/whatsapp/main — 200 — 168.7 KiB — 41 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
56% of JavaScript execution is third-party
First-party Third-party 654ms · 641KB · $9/mo
static.whatsapp.net
Other
Costly
Execution 429ms
Transfer 77 KB
Unused 59%
Monthly Cost $6/mo
static.whatsapp.net
Other
Optional
Execution 91ms
Transfer 188 KB
Monthly Cost $1/mo
static.whatsapp.net
Other
Optional
Execution 69ms
Transfer 188 KB
Unused 78%
Monthly Cost $1/mo
static.whatsapp.net
Other
Optional
Execution 64ms
Transfer 187 KB
Unused 83%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static.whatsapp.net adds 429ms and costs ~$6/month

56% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

static.whatsapp.net takes 429ms 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

59% 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

78% 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

83% 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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-08-25 — 2026-09-21)

LCP (p75)

14486 ms

21% good

INP (p75)

626 ms

25% good

CLS (p75)

0.050

84% good

FCP (p75)

1757 ms

TTFB (p75)

797 ms

Image Optimization
1 images, 5 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

5 KB

1 missing alt text 1 missing dimensions
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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