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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
5
REVIEW
4
PASS
14
INFO
3

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

1.87 s

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

13.31 s

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

3.68 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.

5.18 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.

14.09 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
26
14 PASS 4 REVIEW 5 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 93 requests
FIX
2.5 MB transferred, 93 requests
Warning::
Page weighs 6.7 MB (2.5 MB transferred)
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
Info::
Fonts are 201 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 201 KB
Info::
93 HTTP requests
Info::
Estimated 0.52 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
93 requests
0.52 g CO2 per page load
JavaScript 1.8 MiB 73%
Other 393.5 KiB 16%
Fonts 200.8 KiB 8%
HTML 69.6 KiB 3%
Other 13.0 KiB 1%
Other 8.1 KiB 0%
Images 832 B 0%
CSS 642 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

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

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 (2.5 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7129ms total JS execution
FIX
7129ms total JS execution
Warning::
https://abs.twimg.com/responsive-web/client-web/on...: 2994ms CPU time
Warning::
https://abs.twimg.com/responsive-web/client-web/ma...: 1929ms CPU time
Warning::
Unattributable: 688ms CPU time
Warning::
https://x.com/: 383ms CPU time
Warning::
https://abs.twimg.com/responsive-web/client-web/on...: 284ms CPU time
Warning::
Third-party scripts: 6442ms (90% of total)

Main Thread Breakdown

Script Evaluation 74% Other 12% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://abs.twimg.com/responsive-web/client-web/ondemand.castle.1ff15ffa.js2994ms2904ms54ms3rd
https://abs.twimg.com/responsive-web/client-web/main.88421a3a.js1929ms1623ms160ms3rd
Unattributable688ms28ms0ms1st
https://x.com/383ms53ms114ms3rd
https://abs.twimg.com/responsive-web/client-web/ondemand.s.e3d9a21a.js284ms245ms2ms3rd
https://abs.twimg.com/responsive-web/client-web/vendor.bd8db7da.js205ms25ms86ms3rd
https://abs.twimg.com/responsive-web/client-web/icons.29.c20ee93a.js137ms130ms3ms3rd
https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutShell.bba8fd4a.js108ms82ms26ms3rd
https://x.com/cdn-cgi/challenge-platform/scripts/jsd/api.js?onload=jsdOnload77ms72ms1ms3rd
https://abs.twimg.com/responsive-web/client-web/loader.AppModules.b8f8deba.js70ms56ms14ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
73 scripts, 828 KB unused
FIX
73 scripts, 828 KB unused
Warning::
https://abs.twimg.com/responsive-web/client-web/ma...: 185 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://abs.twimg.com/responsive-web/client-web/ve...: 102 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://abs.twimg.com/responsive-web/client-web/on...: 73 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 72 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://abs.twimg.com/responsive-web/client-web/mo...: 70 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 828 KB
828 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://abs.twimg.com/responsive-web/client-web/main.88421a3a.js371 KB185 KB (50%)✓3rd
https://abs.twimg.com/responsive-web/client-web/vendor.bd8db7da.js204 KB102 KB (50%)✓3rd
https://abs.twimg.com/responsive-web/client-web/ondemand.castle.1ff15ffa.js212 KB73 KB (35%)✓3rd
https://accounts.google.com/gsi/client97 KB72 KB (75%)✓3rd
https://abs.twimg.com/responsive-web/client-web/modules.common.4722c04a.js0 KB70 KB (99%)✓3rd
https://abs.twimg.com/responsive-web/client-web/modules.common.4722c04a.js21 KB70 KB (99%)✓3rd
https://abs.twimg.com/responsive-web/client-web/i18n/en.545d7f0a.js194 KB40 KB (21%)✓3rd
https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutRoutes.adc67d3a.js62 KB31 KB (51%)✓3rd
https://abs.twimg.com/responsive-web/client-web/bundle.LoggedInApiFilters.6d792dca.js0 KB30 KB (62%)✓3rd
https://abs.twimg.com/responsive-web/client-web/bundle.LoggedInApiFilters.6d792dca.js15 KB30 KB (62%)✓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
93 resources · 2.5 MB · 828 KB savings available
FIX
93 resources · 2.5 MB · 828 KB savings available
Warning::
Page weight 2.5 MB exceeds 1 MB target by 1.5 MB
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~828 KB of savings available
Warning::
92 third-party resources (100% of weight)
Info::
3 resources over 200KB
93 resources · 2.5 MiB · 92 third-party 1.5 MiB over 1MB target
JavaScript 88% · 2.2 MiB
Font 8% · 200.8 KiB
Document 3% · 78.0 KiB
Other 1% · 22.0 KiB
Image 0% · 5.4 KiB
CSS 0% · 642 B

~828.3 KiB of savings available

Remove unused JavaScript: 828.3 KiB
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
REVIEW
Main response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
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
HTTP Caching
no-cache, private, must-revalidate, pre-check=0, post-check=0
REVIEW
no-cache, private, must-revalidate, pre-check=0, post-check=0
Info::
Cache-Control header is set
Got: no-cache, private, must-revalidate, pre-check=0, post-check=0
Info::
Last-Modified header present
Cache-Control

no-cache, private, must-revalidate, pre-check=0, post-check=0

DirectiveValueMeaning
no-cache—Cache but always revalidate first
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
pre-check0
post-check0
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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 1 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
4 fonts (201 KB)
PASS
4 fonts (201 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

201 KB total

Render-blocking

0

of 4

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 FCP 1.9 s LCP 13.3 shttps://abs.twimg.com/responsive-web/client-web/Chirp-Regular.80fda27a.woff2Chirp-Regular.80fda27a.... https://abs.twimg.com/responsive-web/client-web/Chirp-Regular.80fda27a.woff2 — 43.8 KiB — 48 ms — font-display: swaphttps://abs.twimg.com/responsive-web/client-web/Chirp-Bold.ebb56aba.woff2Chirp-Bold.ebb56aba.woff2 https://abs.twimg.com/responsive-web/client-web/Chirp-Bold.ebb56aba.woff2 — 44.6 KiB — 48 ms — font-display: swaphttps://abs.twimg.com/responsive-web/client-web/Chirp-Medium.f8e2739a.woff2Chirp-Medium.f8e2739a.w... https://abs.twimg.com/responsive-web/client-web/Chirp-Medium.f8e2739a.woff2 — 43.9 KiB — 49 ms — font-display: swaphttps://abs.twimg.com/responsive-web/client-web/Geist-var.2587a0ca.woff2Geist-var.2587a0ca.woff2 https://abs.twimg.com/responsive-web/client-web/Geist-var.2587a0ca.woff2 — 68.4 KiB — 17 ms — font-display: swap
Chirp-Regular.80fda27a.... woff2 swap
Size 44 KB
Load time 48 ms
Start 142 ms
Risk FOUT — text flashes from fallback to web font
Chirp-Bold.ebb56aba.woff2 woff2 swap
Size 45 KB
Load time 48 ms
Start 143 ms
Risk FOUT — text flashes from fallback to web font
Chirp-Medium.f8e2739a.w... woff2 swap
Size 44 KB
Load time 49 ms
Start 143 ms
Risk FOUT — text flashes from fallback to web font
Geist-var.2587a0ca.woff2 woff2 swap
Size 68 KB
Load time 17 ms
Start 1.0 s
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
34 hints, 0 missing preconnects
PASS
34 hints, 0 missing preconnects
Warning::
3 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://abs.twimg.com/responsive-web/client-web/Chirp-Regular.80fda27a.woff2, https://abs.twimg.com/responsive-web/client-web/Chirp-Bold.ebb56aba.woff2, https://abs.twimg.com/responsive-web/client-web/Chirp-Medium.f8e2739a.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Info::
Page uses 34 resource hint(s)

Current Resource Hints

preconnect
3
preload
+6
16
dns-prefetch
—
prefetch
+5
15

34 resource hints configured

Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://abs.twimg.com/responsive-web/client-web/Chirp-Regular.80fda27a.woff2, https://abs.twimg.com/responsive-web/client-web/Chirp-Bold.ebb56aba.woff2, https://abs.twimg.com/responsive-web/client-web/Chirp-Medium.f8e2739a.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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-cache -- safe revalidate-on-request policy
PASS
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache, private, must-revalidate, pre-check=0, post-check=0
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept
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::
`Last-Modified` present -- timestamp-based conditional GET supported
Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
Total JS execution time is 7.1 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues 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
93 requests over 2146ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 1.9 s LCP 13.3 shttps://twitter.com// https://twitter.com/ — 301 — 8.4 KiB — 53 ms — h2https://x.com/x.com/ https://x.com/ — 200 — 69.6 KiB — 168 ms — h2https://abs.twimg.com/responsive-web/client-web/Chirp-Regular.80fda27a.woff2abs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/Chirp-Regular.80fda27a.woff2 — 200 — 43.8 KiB — 48 ms — h2https://abs.twimg.com/responsive-web/client-web/Chirp-Bold.ebb56aba.woff2abs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/Chirp-Bold.ebb56aba.woff2 — 200 — 44.6 KiB — 48 ms — h2https://abs.twimg.com/responsive-web/client-web/Chirp-Medium.f8e2739a.woff2abs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/Chirp-Medium.f8e2739a.woff2 — 200 — 43.9 KiB — 49 ms — h2https://abs.twimg.com/responsive-web/client-web/vendor.bd8db7da.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/vendor.bd8db7da.js — 200 — 204.1 KiB — 92 ms — h2https://abs.twimg.com/responsive-web/client-web/i18n/en.545d7f0a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/i18n/en.545d7f0a.js — 200 — 193.5 KiB — 98 ms — h2https://abs.twimg.com/responsive-web/client-web/main.88421a3a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/main.88421a3a.js — 200 — 371.3 KiB — 115 ms — h2https://x.com/manifest.jsonx.com/manifest.json https://x.com/manifest.json — 200 — 8.1 KiB — 59 ms — h2https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutShell.bba8fd4a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutShell.bba8fd4a.js — 200 — 24.8 KiB — 56 ms — h2https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutRoutes.adc67d3a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutRoutes.adc67d3a.js — 200 — 62.1 KiB — 55 ms — h2https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutHome.b7129bda.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutHome.b7129bda.js — 200 — 25.2 KiB — 54 ms — h2https://abs.twimg.com/emoji/v2/svg/26a0.svgabs.twimg.com/emoji/v2/svg/26a0.svg https://abs.twimg.com/emoji/v2/svg/26a0.svg — 200 — 832 B — 35 ms — h2https://x.com/cdn-cgi/challenge-platform/scripts/jsd/api.js?onload=jsdOnloadx.com/cdn-cgi/challenge-platform/sc... https://x.com/cdn-cgi/challenge-platform/scripts/jsd/api.js?onload=jsdOnload — 302 — 395 B — 48 ms — h2https://x.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/80a697ecdece/api.js?onload=jsdOnloadx.com/cdn-cgi/challenge-platform/h/... https://x.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/80a697ecdece/api.js?onload=jsdOnload — 200 — 2.7 KiB — 9 ms — h2https://abs.twimg.com/responsive-web/client-web/shared~bundle.LoggedInApiFilters~bundle.PaymentShared~ondemand.PaymentsWebCore.e04e17ba.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/shared~bundle.LoggedInApiFilters~bundle.PaymentShared~ondemand.PaymentsWebCore.e04e17ba.js — 200 — 4.7 KiB — 14 ms — h2https://abs.twimg.com/responsive-web/client-web/bundle.LoggedInApiFilters.6d792dca.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/bundle.LoggedInApiFilters.6d792dca.js — 200 — 15.4 KiB — 16 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.8.0ed675ba.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.8.0ed675ba.js — 200 — 10.5 KiB — 23 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.9.84a89dfa.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.9.84a89dfa.js — 200 — 10.1 KiB — 27 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.1.c688fd1a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.1.c688fd1a.js — 200 — 8.1 KiB — 24 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.22.90066b9a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.22.90066b9a.js — 200 — 8.9 KiB — 29 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.7.282e132a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.7.282e132a.js — 200 — 8.8 KiB — 31 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.5.4347bbfa.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.5.4347bbfa.js — 200 — 6.8 KiB — 35 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.24.80379b6a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.24.80379b6a.js — 200 — 6.9 KiB — 47 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.18.d7cdadaa.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.18.d7cdadaa.js — 200 — 7.9 KiB — 53 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.13.530a54aa.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.13.530a54aa.js — 200 — 7.6 KiB — 57 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.25.3308883a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.25.3308883a.js — 200 — 6.9 KiB — 61 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.14.7073533a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.14.7073533a.js — 200 — 6.9 KiB — 58 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.4.88a3e2fa.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.4.88a3e2fa.js — 200 — 7.4 KiB — 61 ms — h2https://abs.twimg.com/responsive-web/client-web/icons.19.8487ce8a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icons.19.8487ce8a.js — 200 — 8.0 KiB — 35 ms — h2
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h2https://abs.twimg.com/responsive-web/client-web/loader.richScribeAction.c528472a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/loader.richScribeAction.c528472a.js — 200 — 1.4 KiB — 14 ms — h2https://abs.twimg.com/responsive-web/client-web/Geist-var.2587a0ca.woff2abs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/Geist-var.2587a0ca.woff2 — 200 — 68.4 KiB — 17 ms — h2https://abs.twimg.com/responsive-web/client-web/ondemand.s.e3d9a21a.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/ondemand.s.e3d9a21a.js — 200 — 8.9 KiB — 14 ms — h2https://api.x.com/1.1/hashflags.jsonapi.x.com/1.1/hashflags.json https://api.x.com/1.1/hashflags.json — 200 — 0 B — 48 ms — h2https://api.x.com/1.1/flow/viewer.jsonapi.x.com/1.1/flow/viewer.json https://api.x.com/1.1/flow/viewer.json — 200 — 0 B — 51 ms — h2https://abs.twimg.com/favicons/twitter.3.icoabs.twimg.com/favicons/twitter.3.ic... https://abs.twimg.com/favicons/twitter.3.ico — 200 — 767 B — 17 ms — h2https://abs.twimg.com/responsive-web/client-web/icon-default.522d363a.pngabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/icon-default.522d363a.png — 200 — 3.8 KiB — 14 ms — h2https://abs.twimg.com/responsive-web/client-web/ondemand.castle.1ff15ffa.jsabs.twimg.com/responsive-web/client... https://abs.twimg.com/responsive-web/client-web/ondemand.castle.1ff15ffa.js — 200 — 211.8 KiB — 35 ms — h2https://accounts.google.com/gsi/clientaccounts.google.com/gsi/client https://accounts.google.com/gsi/client — 200 — 96.6 KiB — 159 ms — h2https://api.x.com/1.1/hashflags.jsonapi.x.com/1.1/hashflags.json https://api.x.com/1.1/hashflags.json — 200 — 12.7 KiB — 59 ms — h2https://api.x.com/1.1/flow/viewer.jsonapi.x.com/1.1/flow/viewer.json https://api.x.com/1.1/flow/viewer.json — 200 — 326 B — 62 ms — h2blob:https://x.com/2d0a46e3-1494-4e68-9e86-79c7926fcf24x.com/2d0a46e3-1494-4e68-9e86-79c79... blob:https://x.com/2d0a46e3-1494-4e68-9e86-79c7926fcf24 — -1 — 0 B — 0 ms — blob:https://x.com/f9c555c0-12f1-4847-89ea-ec8ad180f0ddx.com/f9c555c0-12f1-4847-89ea-ec8ad... blob:https://x.com/f9c555c0-12f1-4847-89ea-ec8ad180f0dd — 200 — -1 B — 206 ms — blobdata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAABnUlEQVR4AQSATUjTUQDAf76EhNAOQ…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAABnUlEQVR4AQSATUjTUQDAf76EhNAOQ… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAADICAYAAACtWK6eAAAQAElEQVR4AexdCZwU1Z3+ejgGUHCcR…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAADICAYAAACtWK6eAAAQAElEQVR4AexdCZwU1Z3+ejgGUHCcR… — 200 — 0 B — 1 ms — datablob:https://x.com/cab6321e-4dcf-42a3-a766-6d43b8c4a17cx.com/cab6321e-4dcf-42a3-a766-6d43b... blob:https://x.com/cab6321e-4dcf-42a3-a766-6d43b8c4a17c — -1 — 0 B — 0 ms — https://accounts.google.com/gsi/styleaccounts.google.com/gsi/style https://accounts.google.com/gsi/style — 200 — 642 B — 54 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
90% of JavaScript execution is third-party
First-party Third-party 6442ms · 1250KB · €70/mo
abs.twimg.com
Other
Costly
Execution 2994ms
Transfer 212 KB
Unused 35%
Monthly Cost €33/mo
abs.twimg.com
Other
Costly
Execution 1929ms
Transfer 371 KB
Unused 50%
Monthly Cost €21/mo
x.com
Other
Costly
Execution 383ms
Transfer 70 KB
Monthly Cost €4/mo
abs.twimg.com
Other
Costly
Execution 284ms
Transfer 9 KB
Monthly Cost €3/mo
abs.twimg.com
Other
Costly
Execution 205ms
Transfer 204 KB
Unused 50%
Monthly Cost €2/mo
abs.twimg.com
Other
Optional
Execution 137ms
Transfer 7 KB
Monthly Cost €1/mo
abs.twimg.com
Other
Optional
Execution 108ms
Transfer 25 KB
Monthly Cost €1/mo
x.com
Other
Optional
Execution 77ms
Transfer 0 KB
Monthly Cost €1/mo
abs.twimg.com
Other
Optional
Execution 70ms
Transfer 38 KB
Unused 77%
Monthly Cost €1/mo
abs.twimg.com
Other
Optional
Execution 67ms
Transfer 194 KB
Unused 21%
Monthly Cost €1/mo
accounts.google.com
Other
Optional
Execution 66ms
Transfer 97 KB
Unused 75%
Monthly Cost €1/mo
abs.twimg.com
Other
Optional
Execution 65ms
Transfer 23 KB
Monthly Cost €1/mo
abs.twimg.com
Other
Optional
Execution 55ms
Transfer 0 KB
Unused 97%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • abs.twimg.com adds 2994ms and costs ~€33/month
  • abs.twimg.com adds 1929ms and costs ~€21/month
  • x.com adds 383ms and costs ~€4/month
  • abs.twimg.com adds 284ms and costs ~€3/month
  • abs.twimg.com adds 205ms and costs ~€2/month

90% 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

abs.twimg.com takes 2994ms 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

abs.twimg.com takes 1929ms 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

x.com takes 383ms 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

abs.twimg.com takes 284ms 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

abs.twimg.com takes 205ms 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

77% of abs.twimg.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

75% of accounts.google.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

97% of abs.twimg.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

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 (2026-06-10 — 2026-07-07)

LCP (p75)

4185 ms

45% good

INP (p75)

334 ms

51% good

CLS (p75)

0.070

92% good

FCP (p75)

1084 ms

TTFB (p75)

765 ms

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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