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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
1
PASS
10
INFO
2

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

Mobile Desktop
30
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.
81
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.

4.37 s

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

20.67 s

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

3.20 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.

8.01 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.

21.77 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
10 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
3.5 MB transferred, 107 requests
FIX
3.5 MB transferred, 107 requests
Warning::
Page weighs 13.8 MB (3.5 MB transferred)
Warning::
JavaScript is 2.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.8 MB
Warning::
107 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.74 g CO2 per page load
3.5 MB / 2.4 MB budget
3.5 MB transferred
107 requests
0.74 g CO2 per page load
JavaScript 2.8 MiB 79%
Other 325.3 KiB 9%
Images 178.1 KiB 5%
Fonts 148.2 KiB 4%
CSS 69.5 KiB 2%
HTML 42.8 KiB 1%
Other 2.3 KiB 0%
Other 962 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

F
JS Execution Cost
Action
9030ms total JS execution
FIX
9030ms total JS execution
Warning::
https://openai.com/_next/static/chunks/033fjs8zx9_...: 3076ms CPU time
Warning::
Unattributable: 2028ms CPU time
Warning::
https://openai.com/: 1475ms CPU time
Warning::
https://openai.com/cdn-cgi/challenge-platform/scri...: 420ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-8MYC...: 407ms CPU time
Info::
Third-party scripts: 2728ms (30% of total)

Main Thread Breakdown

Script Evaluation 49% Script Parsing & Compilation 19% Other 17% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://openai.com/_next/static/chunks/033fjs8zx9_0g.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX43076ms2945ms42ms1st
Unattributable2028ms447ms0ms3rd
https://openai.com/1475ms174ms164ms1st
https://openai.com/cdn-cgi/challenge-platform/scripts/jsd/main.js420ms404ms4ms1st
https://www.googletagmanager.com/gtag/js?id=G-8MYC5SEFJ1&cx=c&gtm=4e64f0407ms328ms73ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KJ7QK4SN294ms227ms63ms3rd
https://openai.com/_next/static/chunks/0la--9_9d72ga.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4196ms109ms36ms1st
https://openai.com/_next/static/chunks/0y4osfnp-yn71.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4174ms2ms171ms1st
https://openai.com/_next/static/chunks/0pobby.1ubzh0.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4161ms2ms158ms1st
https://openai.com/_next/static/chunks/07fsx~ixctd9k.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4150ms4ms113ms1st

Showing top 10 of 18 scripts

F
JS Bundles
Action
61 scripts, 1.8 MB unused
FIX
61 scripts, 1.8 MB unused
Warning::
https://openai.com/_next/static/chunks/0y4osfnp-yn...: 291 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://openai.com/_next/static/chunks/0pobby.1ubz...: 276 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://openai.com/_next/static/chunks/0d865c_b.ru...: 274 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://openai.com/_next/static/chunks/0wd_pnenlta...: 179 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://openai.com/_next/static/chunks/12m4d0gmv-5...: 99 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.8 MB
1822 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://openai.com/_next/static/chunks/0y4osfnp-yn71.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4300 KB291 KB (100%)✓1st
https://openai.com/_next/static/chunks/0pobby.1ubzh0.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4286 KB276 KB (100%)✓1st
https://openai.com/_next/static/chunks/0d865c_b.rukf.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4275 KB274 KB (100%)✓1st
https://openai.com/_next/static/chunks/0wd_pnenltaov.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4183 KB179 KB (98%)✓1st
https://openai.com/_next/static/chunks/12m4d0gmv-5xe.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX499 KB99 KB (100%)✓1st
https://openai.com/_next/static/chunks/06tn16wnffobf.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4100 KB96 KB (100%)✓1st
https://openai.com/_next/static/chunks/0xu6oh09w2n76.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX485 KB84 KB (99%)✓1st
https://openai.com/_next/static/chunks/07fsx~ixctd9k.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4106 KB75 KB (73%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-8MYC5SEFJ1&cx=c&gtm=4e64f0157 KB66 KB (42%)✓3rd
https://openai.com/_next/static/chunks/0h.l_ibqa8akq.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX455 KB51 KB (94%)✓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

F
Page Weight Inventory
Action
107 resources · 3.5 MB · 1.8 MB savings available
FIX
107 resources · 3.5 MB · 1.8 MB savings available
Warning::
Page weight 2.5 MB over 1MB target
Got: 3.5 MB Expected: ≤ 1 MB
Info::
~1.8 MB of savings available
Info::
24 third-party resources (22% of weight)
Info::
3 resources over 200KB
107 resources · 3.5 MiB · 24 third-party 2.5 MiB over 1MB target
JavaScript 79% · 2.8 MiB
Other 9% · 326.7 KiB
Image 5% · 179.9 KiB
Font 4% · 148.2 KiB
CSS 2% · 69.5 KiB
Document 1% · 42.8 KiB

~1.8 MiB of savings available

Remove unused JavaScript: 1.8 MiB
B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A
Third-Party Impact
22% third-party, 0 ms blocking
PASS
22% third-party, 0 ms blocking
Info::
Third-party code accounts for 22% of page weight (779.1 KiB of 3.5 MiB)
Info::
Third-party blocking time is low (0 ms)
78%
22%
First-party Third-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
11 images, 0 KB saveable
PASS
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 178 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (148 KB)
PASS
3 fonts (148 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

148 KB total

Render-blocking

0

of 3

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 14.0 s 16.0 s 18.0 s 20.0 s FCP 4.4 s LCP 20.7 shttps://cdn.openai.com/common/fonts/openai-sans/v2/OpenAISans-Medium.woff2OpenAISans-Medium.woff2 https://cdn.openai.com/common/fonts/openai-sans/v2/OpenAISans-Medium.woff2 — 50.1 KiB — 97 ms — font-display: swaphttps://cdn.openai.com/common/fonts/openai-sans/v2/OpenAISans-Semibold.woff2OpenAISans-Semibold.woff2 https://cdn.openai.com/common/fonts/openai-sans/v2/OpenAISans-Semibold.woff2 — 50.3 KiB — 92 ms — font-display: swaphttps://cdn.openai.com/common/fonts/openai-sans/v2/OpenAISans-Regular.woff2OpenAISans-Regular.woff2 https://cdn.openai.com/common/fonts/openai-sans/v2/OpenAISans-Regular.woff2 — 47.8 KiB — 90 ms — font-display: swap
OpenAISans-Medium.woff2 woff2 swap
Size 50 KB
Load time 97 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
OpenAISans-Semibold.woff2 woff2 swap
Size 50 KB
Load time 92 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
OpenAISans-Regular.woff2 woff2 swap
Size 48 KB
Load time 90 ms
Start 1.3 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
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
107 requests over 3443ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 4.4 s LCP 20.7 shttps://openai.com// https://openai.com/ — 200 — 42.8 KiB — 335 ms — h2https://openai.com/_next/static/chunks/0txejmm14uux2.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/0txejmm14uux2.... https://openai.com/_next/static/chunks/0txejmm14uux2.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 5.0 KiB — 68 ms — h2https://openai.com/_next/static/chunks/1775it2bu8ao6.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/1775it2bu8ao6.... https://openai.com/_next/static/chunks/1775it2bu8ao6.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 49.1 KiB — 161 ms — h2https://openai.com/_next/static/chunks/17l15w_jzel1l.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/17l15w_jzel1l.... https://openai.com/_next/static/chunks/17l15w_jzel1l.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 4.4 KiB — 42 ms — h2https://openai.com/_next/static/chunks/0efr3qehp9w2z.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/0efr3qehp9w2z.... https://openai.com/_next/static/chunks/0efr3qehp9w2z.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 453 B — 92 ms — h2https://openai.com/_next/static/chunks/0lo9z4drghg2r.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/0lo9z4drghg2r.... https://openai.com/_next/static/chunks/0lo9z4drghg2r.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 615 B — 94 ms — h2https://openai.com/_next/static/chunks/13.c6sw7~1nyq.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/13.c6sw7~1nyq.... https://openai.com/_next/static/chunks/13.c6sw7~1nyq.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 738 B — 58 ms — h2https://openai.com/_next/static/chunks/0prd7-4t0view.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/0prd7-4t0view.... https://openai.com/_next/static/chunks/0prd7-4t0view.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 778 B — 113 ms — h2https://openai.com/_next/static/chunks/16lmw-j1~z090.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/16lmw-j1~z090.... https://openai.com/_next/static/chunks/16lmw-j1~z090.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 3.3 KiB — 40 ms — h2https://openai.com/_next/static/chunks/0s8g591elhy.9.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/0s8g591elhy.9.... https://openai.com/_next/static/chunks/0s8g591elhy.9.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 575 B — 53 ms — h2https://openai.com/_next/static/chunks/03u0te04nx-jy.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/03u0te04nx-jy.... https://openai.com/_next/static/chunks/03u0te04nx-jy.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 607 B — 50 ms — h2https://openai.com/_next/static/chunks/0pcz1hxoyj8fs.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/0pcz1hxoyj8fs.... https://openai.com/_next/static/chunks/0pcz1hxoyj8fs.css?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 3.8 KiB — 113 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KJ7QK4SNwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KJ7QK4SN — 200 — 131.8 KiB — 259 ms — h2https://static.cloudflareinsights.com/beacon.min.jsstatic.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js — 200 — 10.7 KiB — 165 ms — h2https://images.ctfassets.net/kftzwdyauwt9/7Bw8woADAXCAPqWFBfyApV/6a5aeebea79307eca02f86f1995fde09/OAI_GPT-5p4_Art_Card_4x5.png?w=750&q=70&fm=webpimages.ctfassets.net/kftzwdyauwt9/7... https://images.ctfassets.net/kftzwdyauwt9/7Bw8woADAXCAPqWFBfyApV/6a5aeebea79307eca02f86f1995fde09/OAI_GPT-5p4_Art_Card_4x5.png?w=750&q=70&fm=webp — 200 — 12.0 KiB — 161 ms — h2https://openai.com/_next/static/chunks/094ycwqcrk5_5.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/094ycwqcrk5_5.... https://openai.com/_next/static/chunks/094ycwqcrk5_5.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 10.3 KiB — 110 ms — h3https://openai.com/_next/static/chunks/0~4b9_pjcd_xb.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/0~4b9_pjcd_xb.... https://openai.com/_next/static/chunks/0~4b9_pjcd_xb.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 7.8 KiB — 117 ms — h3https://openai.com/_next/static/chunks/172-c6zlkauks.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/172-c6zlkauks.... https://openai.com/_next/static/chunks/172-c6zlkauks.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 11.7 KiB — 115 ms — h3https://openai.com/_next/static/chunks/033fjs8zx9_0g.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/033fjs8zx9_0g.... https://openai.com/_next/static/chunks/033fjs8zx9_0g.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 64.6 KiB — 191 ms — h3https://openai.com/_next/static/chunks/0la--9_9d72ga.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4/_next/static/chunks/0la--9_9d72ga.... https://openai.com/_next/static/chunks/0la--9_9d72ga.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 — 200 — 38.0 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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
30% of JavaScript execution is third-party
First-party Third-party 2728ms · 289KB · $36/mo
Unattributable
Other
Costly
Execution 2028ms
Transfer 0 KB
Monthly Cost $27/mo
Google Tag Manager
Tag Manager
Costly
Execution 407ms
Transfer 157 KB
Unused 42%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 294ms
Transfer 132 KB
Unused 49%
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • Unattributable adds 2028ms and costs ~$27/month
  • Google Tag Manager adds 407ms and costs ~$5/month
  • Google Tag Manager adds 294ms and costs ~$4/month

Unattributable takes 2028ms 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

Google Tag Manager takes 407ms 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

Google Tag Manager takes 294ms 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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