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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

1.88 s

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

9.84 s

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

141.18 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.

9.88 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.

179.28 s

Page Load Progression

4.1 s
8.3 s
12.4 s
16.5 s
20.7 s
24.8 s
28.9 s
33.1 s
Checks
17
10 PASS 3 REVIEW 2 FIX
F
JS Execution Cost
Action
175488ms total JS execution
FIX
175488ms total JS execution
Warning::
https://x.ai/_next/static/chunks/app/(main)/(home)...: 168325ms CPU time
Warning::
https://x.ai/_next/static/chunks/68314-e8c8ee39551...: 1698ms CPU time
Warning::
https://x.ai/_next/static/chunks/38496-f02467fdab6...: 1604ms CPU time
Warning::
Unattributable: 1020ms CPU time
Warning::
https://x.ai/_next/static/chunks/86363-d5d5aa57009...: 701ms CPU time
Info::
Third-party scripts: 1020ms (1% of total)

Main Thread Breakdown

Other 93% Script Evaluation 6%
ScriptTotalScriptingParse/CompileParty
https://x.ai/_next/static/chunks/app/(main)/(home)/page-6cce96f1bc8e8a78.js168325ms7096ms8ms1st
https://x.ai/_next/static/chunks/68314-e8c8ee395511b16c.js1698ms36ms2ms1st
https://x.ai/_next/static/chunks/38496-f02467fdab6f31b7.js1604ms1445ms66ms1st
Unattributable1020ms167ms0ms3rd
https://x.ai/_next/static/chunks/86363-d5d5aa57009dfb70.js701ms669ms31ms1st
https://x.ai/570ms100ms22ms1st
https://x.ai/_next/static/chunks/fc0fe076-c1810b44ae72024a.js423ms332ms88ms1st
https://x.ai/_next/static/chunks/58927-60d95c5ef94d828a.js405ms4ms8ms1st
https://x.ai/cdn-cgi/challenge-platform/scripts/jsd/main.js379ms360ms5ms1st
https://x.ai/_next/static/chunks/23433-19fa66a34c85ea52.js128ms114ms13ms1st

Showing top 10 of 14 scripts

D
JS Bundles
Action
53 scripts, 367 KB unused
FIX
53 scripts, 367 KB unused
Warning::
https://x.ai/_next/static/chunks/fc0fe076-c1810b44...: 89 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://x.ai/_next/static/chunks/28332-8f12f9df997...: 78 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://x.ai/_next/static/chunks/28978-07ef7107469...: 56 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://x.ai/_next/static/chunks/86363-d5d5aa57009...: 48 KB unused (96%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://x.ai/_next/static/chunks/622eaf3d-a3331ffa...: 42 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 367 KB
367 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://x.ai/_next/static/chunks/fc0fe076-c1810b44ae72024a.js114 KB89 KB (78%)✓1st
https://x.ai/_next/static/chunks/28332-8f12f9df997bf83d.js99 KB78 KB (80%)✓1st
https://x.ai/_next/static/chunks/28978-07ef7107469b132b.js61 KB56 KB (92%)✓1st
https://x.ai/_next/static/chunks/86363-d5d5aa57009dfb70.js50 KB48 KB (96%)✓1st
https://x.ai/_next/static/chunks/622eaf3d-a3331ffa4ef2161c.js56 KB42 KB (76%)✓1st
https://x.ai/_next/static/chunks/a5a03073-9e8e27c6f1cb42e4.js74 KB33 KB (45%)✓1st
https://x.ai/_next/static/chunks/0fd4459a-23d6a3a65c49fc6a.js74 KB21 KB (28%)✓1st
https://x.ai/_next/static/chunks/64397-ae3ab226f276bc91.js5 KB—✓1st
https://x.ai/_next/static/chunks/app/layout-4261c4086ffc4778.js1 KB—✓1st
https://x.ai/_next/static/chunks/2224-556c4a9c0cf6297f.js19 KB—✓1st

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

B
Page Weight Budget
1.4 MB transferred, 74 requests
REVIEW
1.4 MB transferred, 74 requests
Info::
Page weighs 4.1 MB (1.4 MB transferred)
Warning::
JavaScript is 1000 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1000 KB
Info::
Fonts are 360 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 360 KB
Info::
74 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
74 requests
0.30 g CO2 per page load
JavaScript 999.5 KiB 68%
Fonts 359.6 KiB 24%
Images 50.0 KiB 3%
CSS 33.1 KiB 2%
HTML 23.6 KiB 2%
Other 1.5 KiB 0%
Other 792 B 0%
Other 355 B 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

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
Page Weight Inventory
Action
74 resources · 1.4 MB · 367 KB savings available
REVIEW
74 resources · 1.4 MB · 367 KB savings available
Warning::
Page weight 444 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~367 KB of savings available
Info::
1 third-party resources (0% of weight)
74 resources · 1.4 MiB · 1 third-party 444.4 KiB over 1MB target
JavaScript 68% · 999.5 KiB
Font 24% · 359.6 KiB
Image 3% · 50.8 KiB
CSS 2% · 33.1 KiB
Document 2% · 23.6 KiB
Other 0% · 1.9 KiB

~366.9 KiB of savings available

Remove unused JavaScript: 366.9 KiB
B
HTTP Caching
s-maxage=31536000
REVIEW
s-maxage=31536000
Info::
Cache-Control header is set
Got: s-maxage=31536000
Info::
CDN TTL: 52 weeks (s-maxage=31536000)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

s-maxage=31536000

DirectiveValueMeaning
s-maxage31536000CDN caches for 52 weeks
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 50 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
9 fonts (360 KB)
PASS
9 fonts (360 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

360 KB total

Render-blocking

0

of 9

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 FCP 1.9 s LCP 9.8 shttps://x.ai/_next/static/media/1f2316909698f815-s.p.woff21f2316909698f815-s.p.woff2 https://x.ai/_next/static/media/1f2316909698f815-s.p.woff2 — 38.5 KiB — 103 ms — font-display: swaphttps://x.ai/_next/static/media/3d4419af2cf8609b-s.p.woff23d4419af2cf8609b-s.p.woff2 https://x.ai/_next/static/media/3d4419af2cf8609b-s.p.woff2 — 37.0 KiB — 69 ms — font-display: swaphttps://x.ai/_next/static/media/4dec29efcaeb336c-s.p.woff24dec29efcaeb336c-s.p.woff2 https://x.ai/_next/static/media/4dec29efcaeb336c-s.p.woff2 — 38.6 KiB — 157 ms — font-display: swaphttps://x.ai/_next/static/media/66f30814ff6d7cdf.p.woff266f30814ff6d7cdf.p.woff2 https://x.ai/_next/static/media/66f30814ff6d7cdf.p.woff2 — 56.9 KiB — 219 ms — font-display: swaphttps://x.ai/_next/static/media/74452ea3ef0f9101-s.p.woff274452ea3ef0f9101-s.p.woff2 https://x.ai/_next/static/media/74452ea3ef0f9101-s.p.woff2 — 37.3 KiB — 219 ms — font-display: swaphttps://x.ai/_next/static/media/904ef0a86fe32a00-s.p.woff2904ef0a86fe32a00-s.p.woff2 https://x.ai/_next/static/media/904ef0a86fe32a00-s.p.woff2 — 38.1 KiB — 219 ms — font-display: swaphttps://x.ai/_next/static/media/d886a03bcda7ad8f-s.p.woff2d886a03bcda7ad8f-s.p.woff2 https://x.ai/_next/static/media/d886a03bcda7ad8f-s.p.woff2 — 36.8 KiB — 242 ms — font-display: swaphttps://x.ai/_next/static/media/e1447589d6f59c4b-s.p.woff2e1447589d6f59c4b-s.p.woff2 https://x.ai/_next/static/media/e1447589d6f59c4b-s.p.woff2 — 37.2 KiB — 242 ms — font-display: swaphttps://x.ai/_next/static/media/f5a90156f8995c8c-s.p.woff2f5a90156f8995c8c-s.p.woff2 https://x.ai/_next/static/media/f5a90156f8995c8c-s.p.woff2 — 39.2 KiB — 242 ms — font-display: swap
1f2316909698f815-s.p.woff2 woff2 swap
Size 39 KB
Load time 103 ms
Start 141 ms
Risk FOUT — text flashes from fallback to web font
3d4419af2cf8609b-s.p.woff2 woff2 swap
Size 37 KB
Load time 69 ms
Start 141 ms
Risk FOUT — text flashes from fallback to web font
4dec29efcaeb336c-s.p.woff2 woff2 swap
Size 39 KB
Load time 157 ms
Start 142 ms
Risk FOUT — text flashes from fallback to web font
66f30814ff6d7cdf.p.woff2 woff2 swap
Size 57 KB
Load time 219 ms
Start 143 ms
Risk FOUT — text flashes from fallback to web font
74452ea3ef0f9101-s.p.woff2 woff2 swap
Size 37 KB
Load time 219 ms
Start 144 ms
Risk FOUT — text flashes from fallback to web font
904ef0a86fe32a00-s.p.woff2 woff2 swap
Size 38 KB
Load time 219 ms
Start 144 ms
Risk FOUT — text flashes from fallback to web font
d886a03bcda7ad8f-s.p.woff2 woff2 swap
Size 37 KB
Load time 242 ms
Start 144 ms
Risk FOUT — text flashes from fallback to web font
e1447589d6f59c4b-s.p.woff2 woff2 swap
Size 37 KB
Load time 242 ms
Start 145 ms
Risk FOUT — text flashes from fallback to web font
f5a90156f8995c8c-s.p.woff2 woff2 swap
Size 39 KB
Load time 242 ms
Start 146 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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
74 requests over 1875ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 1.9 s LCP 9.8 shttps://x.ai// https://x.ai/ — 200 — 23.6 KiB — 359 ms — h2https://x.ai/_next/static/media/1f2316909698f815-s.p.woff2/_next/static/media/1f2316909698f81... https://x.ai/_next/static/media/1f2316909698f815-s.p.woff2 — 200 — 38.5 KiB — 103 ms — h2https://x.ai/_next/static/media/3d4419af2cf8609b-s.p.woff2/_next/static/media/3d4419af2cf8609... https://x.ai/_next/static/media/3d4419af2cf8609b-s.p.woff2 — 200 — 37.0 KiB — 69 ms — h2https://x.ai/_next/static/media/4dec29efcaeb336c-s.p.woff2/_next/static/media/4dec29efcaeb336... https://x.ai/_next/static/media/4dec29efcaeb336c-s.p.woff2 — 200 — 38.6 KiB — 157 ms — h2https://x.ai/_next/static/media/66f30814ff6d7cdf.p.woff2/_next/static/media/66f30814ff6d7cd... https://x.ai/_next/static/media/66f30814ff6d7cdf.p.woff2 — 200 — 56.9 KiB — 219 ms — h2https://x.ai/_next/static/media/74452ea3ef0f9101-s.p.woff2/_next/static/media/74452ea3ef0f910... https://x.ai/_next/static/media/74452ea3ef0f9101-s.p.woff2 — 200 — 37.3 KiB — 219 ms — h2https://x.ai/_next/static/media/904ef0a86fe32a00-s.p.woff2/_next/static/media/904ef0a86fe32a0... https://x.ai/_next/static/media/904ef0a86fe32a00-s.p.woff2 — 200 — 38.1 KiB — 219 ms — h2https://x.ai/_next/static/media/d886a03bcda7ad8f-s.p.woff2/_next/static/media/d886a03bcda7ad8... https://x.ai/_next/static/media/d886a03bcda7ad8f-s.p.woff2 — 200 — 36.8 KiB — 242 ms — h2https://x.ai/_next/static/media/e1447589d6f59c4b-s.p.woff2/_next/static/media/e1447589d6f59c4... https://x.ai/_next/static/media/e1447589d6f59c4b-s.p.woff2 — 200 — 37.2 KiB — 242 ms — h2https://x.ai/_next/static/media/f5a90156f8995c8c-s.p.woff2/_next/static/media/f5a90156f8995c8... https://x.ai/_next/static/media/f5a90156f8995c8c-s.p.woff2 — 200 — 39.2 KiB — 242 ms — h2https://x.ai/_next/static/css/6bd1afdc5dfb47e5.css/_next/static/css/6bd1afdc5dfb47e5.... https://x.ai/_next/static/css/6bd1afdc5dfb47e5.css — 200 — 788 B — 24 ms — h2https://x.ai/_next/static/css/f16861d4583c61ff.css/_next/static/css/f16861d4583c61ff.... https://x.ai/_next/static/css/f16861d4583c61ff.css — 200 — 27.8 KiB — 43 ms — h2https://x.ai/_next/static/css/8b49a788e502c38a.css/_next/static/css/8b49a788e502c38a.... https://x.ai/_next/static/css/8b49a788e502c38a.css — 200 — 4.0 KiB — 37 ms — h2https://x.ai/_next/static/css/16b700aa6a93f121.css/_next/static/css/16b700aa6a93f121.... https://x.ai/_next/static/css/16b700aa6a93f121.css — 200 — 577 B — 30 ms — h2https://x.ai/_next/static/chunks/webpack-5f5be88a9a1be982.js/_next/static/chunks/webpack-5f5be8... https://x.ai/_next/static/chunks/webpack-5f5be88a9a1be982.js — 200 — 6.5 KiB — 226 ms — h2https://x.ai/_next/static/chunks/38bfb154-4bf31dde81bbb49f.js/_next/static/chunks/38bfb154-4bf31... https://x.ai/_next/static/chunks/38bfb154-4bf31dde81bbb49f.js — 200 — 53.2 KiB — 231 ms — h2https://x.ai/_next/static/chunks/38496-f02467fdab6f31b7.js/_next/static/chunks/38496-f02467fd... https://x.ai/_next/static/chunks/38496-f02467fdab6f31b7.js — 200 — 45.4 KiB — 239 ms — h2https://x.ai/_next/static/chunks/main-app-7a0d7919cf764fff.js/_next/static/chunks/main-app-7a0d7... https://x.ai/_next/static/chunks/main-app-7a0d7919cf764fff.js — 200 — 404 B — 239 ms — h2https://x.ai/_next/static/chunks/71331-105d714010fc2652.js/_next/static/chunks/71331-105d7140... https://x.ai/_next/static/chunks/71331-105d714010fc2652.js — 200 — 5.3 KiB — 239 ms — h2https://x.ai/_next/static/chunks/72811-b0b98ee1f213d4c9.js/_next/static/chunks/72811-b0b98ee1... https://x.ai/_next/static/chunks/72811-b0b98ee1f213d4c9.js — 200 — 7.0 KiB — 239 ms — h2https://x.ai/_next/static/chunks/30462-372f582f4f6b0bca.js/_next/static/chunks/30462-372f582f... https://x.ai/_next/static/chunks/30462-372f582f4f6b0bca.js — 200 — 3.2 KiB — 238 ms — h2https://x.ai/_next/static/chunks/68314-e8c8ee395511b16c.js/_next/static/chunks/68314-e8c8ee39... https://x.ai/_next/static/chunks/68314-e8c8ee395511b16c.js — 200 — 5.3 KiB — 238 ms — h2https://x.ai/_next/static/chunks/58927-60d95c5ef94d828a.js/_next/static/chunks/58927-60d95c5e... https://x.ai/_next/static/chunks/58927-60d95c5ef94d828a.js — 200 — 16.5 KiB — 238 ms — h2https://x.ai/_next/static/chunks/2224-556c4a9c0cf6297f.js/_next/static/chunks/2224-556c4a9c0... https://x.ai/_next/static/chunks/2224-556c4a9c0cf6297f.js — 200 — 19.0 KiB — 217 ms — h2https://x.ai/_next/static/chunks/3355-7bb69067767fbc0d.js/_next/static/chunks/3355-7bb690677... https://x.ai/_next/static/chunks/3355-7bb69067767fbc0d.js — 200 — 9.0 KiB — 216 ms — h2https://x.ai/_next/static/chunks/70306-d0401d18258a4ac1.js/_next/static/chunks/70306-d0401d18... https://x.ai/_next/static/chunks/70306-d0401d18258a4ac1.js — 200 — 2.8 KiB — 217 ms — h2https://x.ai/_next/static/chunks/23433-19fa66a34c85ea52.js/_next/static/chunks/23433-19fa66a3... https://x.ai/_next/static/chunks/23433-19fa66a34c85ea52.js — 200 — 18.0 KiB — 217 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
1% of JavaScript execution is third-party
First-party Third-party 1020ms · 0KB · $14/mo
Unattributable
Other
Costly
Execution 1020ms
Transfer 0 KB
Monthly Cost $14/mo

These scripts may cost more than they're worth

  • Unattributable adds 1020ms and costs ~$14/month

Unattributable takes 1020ms 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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