Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
527 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.32 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
374 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.012
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.54 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.
4.55 s
Page Load Progression
FPage Weight BudgetAction4.6 MB transferred, 114 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DJS Execution CostAction2292ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://openai.com/_next/static/chunks/033fjs8zx9_0g.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 808ms | 730ms | 11ms | 1st |
| Unattributable | 537ms | 137ms | 0ms | 3rd |
| https://openai.com/ | 445ms | 48ms | 24ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-8MYC5SEFJ1&cx=c>m=4e64f0&bs=ctrl | 129ms | 106ms | 22ms | 3rd |
| https://openai.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 119ms | 110ms | 2ms | 1st |
| https://www.googletagmanager.com/gtm.js?id=GTM-KJ7QK4SN | 101ms | 83ms | 16ms | 3rd |
| https://openai.com/_next/static/chunks/07fsx~ixctd9k.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 85ms | 2ms | 28ms | 1st |
| https://openai.com/_next/static/chunks/0la--9_9d72ga.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 68ms | 42ms | 6ms | 1st |
FJS BundlesAction61 scripts, 1.8 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://openai.com/_next/static/chunks/0y4osfnp-yn71.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 300 KB | 291 KB (100%) | ✓ | 1st |
| https://openai.com/_next/static/chunks/0pobby.1ubzh0.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 286 KB | 276 KB (100%) | ✓ | 1st |
| https://openai.com/_next/static/chunks/0d865c_b.rukf.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 275 KB | 274 KB (100%) | ✓ | 1st |
| https://openai.com/_next/static/chunks/0wd_pnenltaov.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 183 KB | 179 KB (98%) | ✓ | 1st |
| https://openai.com/_next/static/chunks/12m4d0gmv-5xe.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 99 KB | 99 KB (100%) | ✓ | 1st |
| https://openai.com/_next/static/chunks/06tn16wnffobf.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 100 KB | 96 KB (100%) | ✓ | 1st |
| https://openai.com/_next/static/chunks/0xu6oh09w2n76.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 85 KB | 84 KB (99%) | ✓ | 1st |
| https://openai.com/_next/static/chunks/07fsx~ixctd9k.js?dpl=dpl_E9iMCfvk7bFDDGxLZ88UH7DRNvX4 | 106 KB | 75 KB (73%) | ✓ | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-8MYC5SEFJ1&cx=c>m=4e64f0&bs=ctrl | 157 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KJ7QK4SN | 132 KB | 64 KB (49%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction114 resources · 4.6 MB · 1.8 MB savings availableFIX
~1.8 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 114 resources | 4.6 MiB | ||||||
BHTTP Cachingpublic, max-age=0, must-revalidateREVIEW
public, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
AThird-Party Impact39% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization17 images, 0 KB saveablePASS
A+Font Loading3 fonts (148 KB)PASS
Web fonts
3
148 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall114 requests over 3482msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 537ms | 0 KB | — | $7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 129ms | 157 KB | 42% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 101ms | 132 KB | 49% | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 537ms and costs ~$7/month
Unattributable takes 537ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev