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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
2
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.
89
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.

336 ms

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

1.25 s

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

33.88 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.

3.84 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.

44.94 s

Page Load Progression

5.6 s
11.3 s
16.9 s
22.5 s
28.1 s
33.8 s
39.4 s
45.0 s
Checks
15
8 PASS 2 REVIEW 3 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 95 requests
FIX
2.1 MB transferred, 95 requests
Info::
Page weighs 5.4 MB (2.1 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
Fonts are 358 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 358 KB
Info::
95 HTTP requests
Info::
Estimated 0.44 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
95 requests
0.44 g CO2 per page load
JavaScript 1.2 MiB 56%
Images 458.4 KiB 22%
Fonts 358.2 KiB 17%
Other 59.7 KiB 3%
CSS 33.7 KiB 2%
HTML 23.6 KiB 1%
Other 1.5 KiB 0%
Other 996 B 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

F
JS Execution Cost
Action
44610ms total JS execution
FIX
44610ms total JS execution
Warning::
https://x.ai/_next/static/chunks/app/(main)/(home)...: 41850ms CPU time
Warning::
https://x.ai/_next/static/chunks/68314-e8c8ee39551...: 1126ms CPU time
Warning::
https://x.ai/_next/static/chunks/38496-f02467fdab6...: 587ms CPU time
Warning::
https://x.ai/_next/static/chunks/58927-60d95c5ef94...: 295ms CPU time
Info::
Unattributable: 243ms CPU time
Info::
Third-party scripts: 243ms (1% of total)

Main Thread Breakdown

Other 94% Script Evaluation 5%
ScriptTotalScriptingParse/CompileParty
https://x.ai/_next/static/chunks/app/(main)/(home)/page-6cce96f1bc8e8a78.js41850ms1129ms2ms1st
https://x.ai/_next/static/chunks/68314-e8c8ee395511b16c.js1126ms16ms1ms1st
https://x.ai/_next/static/chunks/38496-f02467fdab6f31b7.js587ms521ms16ms1st
https://x.ai/_next/static/chunks/58927-60d95c5ef94d828a.js295ms2ms2ms1st
Unattributable243ms35ms0ms3rd
https://x.ai/_next/static/chunks/97079-b1ecc7aa1700553f.js166ms159ms1ms1st
https://x.ai/144ms22ms7ms1st
https://x.ai/cdn-cgi/challenge-platform/scripts/jsd/main.js105ms100ms1ms1st
https://x.ai/_next/static/chunks/fc0fe076-c1810b44ae72024a.js95ms78ms16ms1st
D
JS Bundles
Action
66 scripts, 387 KB unused
FIX
66 scripts, 387 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: 387 KB
387 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/app/(main)/grok/page-9f5a2e5e7389397c.js21 KB20 KB (97%)✓1st
https://x.ai/_next/static/chunks/0fd4459a-23d6a3a65c49fc6a.js74 KB20 KB (28%)✓1st
https://x.ai/_next/static/chunks/19766-bbb07cea41eedc98.js8 KB—✓1st
https://x.ai/_next/static/chunks/64984-d5f4101d223708bc.js10 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

C
Page Weight Inventory
Action
95 resources · 2.1 MB · 387 KB savings available
REVIEW
95 resources · 2.1 MB · 387 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~387 KB of savings available
Info::
1 third-party resources (0% of weight)
Info::
1 resources over 200KB
95 resources · 2.1 MiB · 1 third-party 1.1 MiB over 1MB target
JavaScript 56% · 1.2 MiB
Image 22% · 459.1 KiB
Font 17% · 358.2 KiB
Other 3% · 61.5 KiB
CSS 2% · 33.7 KiB
Document 1% · 23.6 KiB

~387.0 KiB of savings available

Remove unused JavaScript: 387.0 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 458 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
9 fonts (358 KB)
PASS
9 fonts (358 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

358 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 500 ms 1.0 s FCP 336 ms LCP 1.2 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 — 23 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 — 83 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 — 38.5 KiB — 105 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 — 108 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 — 36.7 KiB — 108 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 — 177 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 — 177 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 — 177 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 — 38.5 KiB — 240 ms — font-display: swap
1f2316909698f815-s.p.woff2 woff2 swap
Size 39 KB
Load time 23 ms
Start 130 ms
Risk FOUT — text flashes from fallback to web font
3d4419af2cf8609b-s.p.woff2 woff2 swap
Size 37 KB
Load time 83 ms
Start 131 ms
Risk FOUT — text flashes from fallback to web font
4dec29efcaeb336c-s.p.woff2 woff2 swap
Size 39 KB
Load time 105 ms
Start 132 ms
Risk FOUT — text flashes from fallback to web font
66f30814ff6d7cdf.p.woff2 woff2 swap
Size 57 KB
Load time 108 ms
Start 132 ms
Risk FOUT — text flashes from fallback to web font
74452ea3ef0f9101-s.p.woff2 woff2 swap
Size 37 KB
Load time 108 ms
Start 133 ms
Risk FOUT — text flashes from fallback to web font
904ef0a86fe32a00-s.p.woff2 woff2 swap
Size 38 KB
Load time 177 ms
Start 133 ms
Risk FOUT — text flashes from fallback to web font
d886a03bcda7ad8f-s.p.woff2 woff2 swap
Size 37 KB
Load time 177 ms
Start 134 ms
Risk FOUT — text flashes from fallback to web font
e1447589d6f59c4b-s.p.woff2 woff2 swap
Size 37 KB
Load time 177 ms
Start 134 ms
Risk FOUT — text flashes from fallback to web font
f5a90156f8995c8c-s.p.woff2 woff2 swap
Size 39 KB
Load time 240 ms
Start 135 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
95 requests over 3332ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 336 ms LCP 1.2 shttps://x.ai// https://x.ai/ — 200 — 23.6 KiB — 240 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 — 23 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 — 83 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 — 38.5 KiB — 105 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 — 108 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 — 36.7 KiB — 108 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 — 177 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 — 177 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 — 177 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 — 38.5 KiB — 240 ms — h2https://x.ai/_next/static/css/6bd1afdc5dfb47e5.css/_next/static/css/6bd1afdc5dfb47e5.... https://x.ai/_next/static/css/6bd1afdc5dfb47e5.css — 200 — 788 B — 13 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 — 33 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 — 30 ms — h2https://x.ai/_next/static/css/16b700aa6a93f121.css/_next/static/css/16b700aa6a93f121.... https://x.ai/_next/static/css/16b700aa6a93f121.css — 200 — 577 B — 23 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 — 189 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 — 208 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 — 209 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 — 308 B — 208 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 — 208 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 — 208 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 — 207 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 — 207 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 — 207 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 — 209 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 — 208 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 — 208 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 — 208 ms — h2https://x.ai/_next/static/chunks/app/(main)/layout-c3c2ee6d52353c1e.js/_next/static/chunks/app/(main)/lay... https://x.ai/_next/static/chunks/app/(main)/layout-c3c2ee6d52353c1e.js — 200 — 5.4 KiB — 208 ms — h2https://x.ai/_next/static/chunks/app/(memphis)/layout-d0a6a561048c9853.js/_next/static/chunks/app/(memphis)/... https://x.ai/_next/static/chunks/app/(memphis)/layout-d0a6a561048c9853.js — 200 — 5.7 KiB — 207 ms — h2https://x.ai/_next/static/chunks/app/global-error-18d4e4bfbd3b049c.js/_next/static/chunks/app/global-err... https://x.ai/_next/static/chunks/app/global-error-18d4e4bfbd3b049c.js — 200 — 2.6 KiB — 207 ms — h2
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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 243ms · 0KB · $3/mo
Unattributable
Other
Costly
Execution 243ms
Transfer 0 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • Unattributable adds 243ms and costs ~$3/month

Unattributable takes 243ms 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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