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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
0
REVIEW
4
PASS
15
INFO
3

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

994 ms

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

1.28 s

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

8 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.072

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

994 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.29 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
22
15 PASS 4 REVIEW
B
JS Execution Cost
585ms total JS execution
REVIEW
585ms total JS execution
Info::
https://ai-tooluniverse.com/: 183ms CPU time
Info::
Unattributable: 138ms CPU time
Info::
https://ai-tooluniverse.com/cdn-cgi/challenge-plat...: 117ms CPU time
Info::
https://ai-tooluniverse.com/assets/vendor-react-D5...: 98ms CPU time
Info::
https://ai-tooluniverse.com/assets/vendor-firebase...: 50ms CPU time

Main Thread Breakdown

Script Evaluation 42% Other 26% Style & Layout 21% Garbage Collection 5% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://ai-tooluniverse.com/183ms13ms0ms1st
Unattributable138ms10ms0ms1st
https://ai-tooluniverse.com/cdn-cgi/challenge-platform/scripts/jsd/main.js?ray=a59c89de4dd16fdb117ms100ms1ms1st
https://ai-tooluniverse.com/assets/vendor-react-D5turm5N.js98ms88ms0ms1st
https://ai-tooluniverse.com/assets/vendor-firebase-prd_9C_3.js50ms39ms0ms1st
B
JS Bundles
9 scripts, 147 KB unused
REVIEW
9 scripts, 147 KB unused
Warning::
https://ai-tooluniverse.com/assets/vendor-firebase...: 118 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ai-tooluniverse.com/assets/vendor-react-D5...: 30 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 147 KB
147 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ai-tooluniverse.com/assets/vendor-firebase-prd_9C_3.js167 KB118 KB (71%)✓1st
https://ai-tooluniverse.com/assets/vendor-react-D5turm5N.js65 KB30 KB (46%)✓1st
https://ai-tooluniverse.com/assets/index-CK5R5rm3.js55 KB—✓1st
https://ai-tooluniverse.com/assets/rolldown-runtime-XKyaHtl9.js1 KB—✓1st
https://ai-tooluniverse.com/assets/vendor-icons-BP6LKcZY.js11 KB—✓1st
https://ai-tooluniverse.com/assets/AuthContext-Ci3G-R-O.js2 KB—✓1st
https://ai-tooluniverse.com/assets/AuthModal-CRzo6Fj4.js4 KB—✓1st
https://ai-tooluniverse.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/7c7fee70a876/main.js?ray=a59c89de4dd16fdb17 KB—✓1st
https://ai-tooluniverse.com/assets/UpgradeModal-DDM5PvFd.js1 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

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
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+
Page Weight Budget
407 KB transferred, 24 requests
PASS
407 KB transferred, 24 requests
Info::
Page weighs 1.3 MB (407 KB transferred)
Info::
24 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
407 KB / 2.4 MB budget
407 KB transferred
24 requests
0.08 g CO2 per page load
JavaScript 323.9 KiB 80%
Other 32.3 KiB 8%
Fonts 26.7 KiB 7%
CSS 18.7 KiB 5%
HTML 2.0 KiB 0%
Other 1.3 KiB 0%
Other 1.0 KiB 0%
Other 1.0 KiB 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
7% third-party, 0 ms blocking
PASS
7% third-party, 0 ms blocking
Info::
Third-party code accounts for 7% of page weight (28.9 KiB of 406.9 KiB)
Info::
Third-party blocking time is low (0 ms)
93%
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
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
1 fonts (27 KB)
PASS
1 fonts (27 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

27 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 994 ms LCP 1.3 shttps://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2LDIoaomQNQcsA88c7O9yZ4K... https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2 — 26.7 KiB — 30 ms — font-display: swap
LDIoaomQNQcsA88c7O9yZ4K... woff2 swap
Size 27 KB
Load time 30 ms
Start 398 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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
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 max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: accept-encoding
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::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+
Page Weight Inventory
24 resources · 407 KB · 147 KB savings available
PASS
24 resources · 407 KB · 147 KB savings available
Info::
Within 1MB page-weight target
Got: 407 KB
Info::
~147 KB of savings available
Info::
5 third-party resources (7% of weight)
24 resources · 406.9 KiB · 5 third-party Within 1MB page-weight target
JavaScript 80% · 323.9 KiB
Other 9% · 34.6 KiB
Font 7% · 26.7 KiB
CSS 5% · 18.7 KiB
Document 0% · 2.0 KiB
Image 0% · 1.0 KiB

~147.2 KiB of savings available

Remove unused JavaScript: 147.2 KiB
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

Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
24 requests over 6511ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 994 ms LCP 1.3 shttps://ai-tooluniverse.com// https://ai-tooluniverse.com/ — 200 — 2.0 KiB — 125 ms — h3https://ai-tooluniverse.com/assets/index-CK5R5rm3.js/assets/index-CK5R5rm3.js https://ai-tooluniverse.com/assets/index-CK5R5rm3.js — 200 — 55.5 KiB — 101 ms — h3https://ai-tooluniverse.com/assets/rolldown-runtime-XKyaHtl9.js/assets/rolldown-runtime-XKyaHtl9.j... https://ai-tooluniverse.com/assets/rolldown-runtime-XKyaHtl9.js — 200 — 1.0 KiB — 30 ms — h3https://ai-tooluniverse.com/assets/vendor-icons-BP6LKcZY.js/assets/vendor-icons-BP6LKcZY.js https://ai-tooluniverse.com/assets/vendor-icons-BP6LKcZY.js — 200 — 11.2 KiB — 79 ms — h3https://ai-tooluniverse.com/assets/vendor-react-D5turm5N.js/assets/vendor-react-D5turm5N.js https://ai-tooluniverse.com/assets/vendor-react-D5turm5N.js — 200 — 64.8 KiB — 84 ms — h3https://ai-tooluniverse.com/assets/vendor-firebase-prd_9C_3.js/assets/vendor-firebase-prd_9C_3.js https://ai-tooluniverse.com/assets/vendor-firebase-prd_9C_3.js — 200 — 167.2 KiB — 105 ms — h3https://ai-tooluniverse.com/assets/AuthContext-Ci3G-R-O.js/assets/AuthContext-Ci3G-R-O.js https://ai-tooluniverse.com/assets/AuthContext-Ci3G-R-O.js — 200 — 2.3 KiB — 67 ms — h3https://ai-tooluniverse.com/assets/index-DmcXwzYN.css/assets/index-DmcXwzYN.css https://ai-tooluniverse.com/assets/index-DmcXwzYN.css — 200 — 17.3 KiB — 81 ms — h3https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swapfonts.googleapis.com/css2?family=Pl... https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap — 200 — 1.4 KiB — 70 ms — h2https://ai-tooluniverse.com/manifest.json/manifest.json https://ai-tooluniverse.com/manifest.json — 200 — 1.0 KiB — 93 ms — h3https://ai-tooluniverse.com/cdn-cgi/challenge-platform/scripts/jsd/main.js?ray=a59c89de4dd16fdb/cdn-cgi/challenge-platform/scripts... https://ai-tooluniverse.com/cdn-cgi/challenge-platform/scripts/jsd/main.js?ray=a59c89de4dd16fdb — 302 — 237 B — 117 ms — h3https://ai-tooluniverse.com/assets/AuthModal-CRzo6Fj4.js/assets/AuthModal-CRzo6Fj4.js https://ai-tooluniverse.com/assets/AuthModal-CRzo6Fj4.js — 200 — 3.9 KiB — 26 ms — h3https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2fonts.gstatic.com/s/plusjakartasans... https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2 — 200 — 26.7 KiB — 30 ms — h3https://ai-tooluniverse.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/7c7fee70a876/main.js?ray=a59c89de4dd16fdb/cdn-cgi/challenge-platform/h/g/scr... https://ai-tooluniverse.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/7c7fee70a876/main.js?ray=a59c89de4dd16fdb — 200 — 17.1 KiB — 27 ms — h3https://ai-tooluniverse.com/icon.svg/icon.svg https://ai-tooluniverse.com/icon.svg — 200 — 1.0 KiB — 73 ms — h3https://ai-tooluniverse.com/icon.svg/icon.svg https://ai-tooluniverse.com/icon.svg — 200 — 0 B — 36 ms — h3https://ai-tooluniverse.com/assets/UpgradeModal-DDM5PvFd.js/assets/UpgradeModal-DDM5PvFd.js https://ai-tooluniverse.com/assets/UpgradeModal-DDM5PvFd.js — 200 — 956 B — 27 ms — h3https://ai-tooluniverse.com/cdn-cgi/challenge-platform/h/g/jsd/oneshot/7c7fee70a876/0.0825131970381704:1794557727:hNyW8Dg5Tw5iCkYnS2C81mhKEvocES_ahGTMfdHGe7k/a59c89de4dd16fdb/cdn-cgi/challenge-platform/h/g/jsd... https://ai-tooluniverse.com/cdn-cgi/challenge-platform/h/g/jsd/oneshot/7c7fee70a876/0.0825131970381704:1794557727:hNyW8Dg5Tw5iCkYnS2C81mhKEvocES_ahGTMfdHGe7k/a59c89de4dd16fdb — 200 — 1.0 KiB — 24 ms — h3https://firestore.googleapis.com/google.firestore.v1.Firestore/Listen/channel?VER=8&database=projects%2Fai-tool-universe-bb584%2Fdatabases%2Fai-studio-aitooluniverse-ca2d8ed4-c1d9-47f2-ba27-62becb9a5950&RID=83261&CVER=22&X-HTTP-Session-Id=gsessionid&zx=gu9d7btjljhe&t=1firestore.googleapis.com/google.fir... https://firestore.googleapis.com/google.firestore.v1.Firestore/Listen/channel?VER=8&database=projects%2Fai-tool-universe-bb584%2Fdatabases%2Fai-studio-aitooluniverse-ca2d8ed4-c1d9-47f2-ba27-62becb9a5950&RID=83261&CVER=22&X-HTTP-Session-Id=gsessionid&zx=gu9d7btjljhe&t=1 — 200 — 341 B — 2.0 s — h2https://ai-tooluniverse.com/api/tools?limit=100/api/tools?limit=100 https://ai-tooluniverse.com/api/tools?limit=100 — 200 — 25.1 KiB — 2.3 s — h3https://ai-tooluniverse.com/api/categories/api/categories https://ai-tooluniverse.com/api/categories — 200 — 2.7 KiB — 2.4 s — h3https://ai-tooluniverse.com/api/blog/api/blog https://ai-tooluniverse.com/api/blog — 200 — 3.7 KiB — 2.0 s — h3https://firestore.googleapis.com/google.firestore.v1.Firestore/Listen/channel?gsessionid=S7WAW4Pv12-nsUHZiwCKsMB56KkMkn7uUDf0My4uabWO2fNeq4r8cw&VER=8&database=projects%2Fai-tool-universe-bb584%2Fdatabases%2Fai-studio-aitooluniverse-ca2d8ed4-c1d9-47f2-ba27-62becb9a5950&RID=rpc&SID=hRBbAejB8_jhRAsougaS3g&AID=0&CI=0&TYPE=xmlhttp&zx=xiiwqqh7bo9g&t=1firestore.googleapis.com/google.fir... https://firestore.googleapis.com/google.firestore.v1.Firestore/Listen/channel?gsessionid=S7WAW4Pv12-nsUHZiwCKsMB56KkMkn7uUDf0My4uabWO2fNeq4r8cw&VER=8&database=projects%2Fai-tool-universe-bb584%2Fdatabases%2Fai-studio-aitooluniverse-ca2d8ed4-c1d9-47f2-ba27-62becb9a5950&RID=rpc&SID=hRBbAejB8_jhRAsougaS3g&AID=0&CI=0&TYPE=xmlhttp&zx=xiiwqqh7bo9g&t=1 — 200 — 475 B — 1.9 s — h2https://firestore.googleapis.com/google.firestore.v1.Firestore/Listen/channel?VER=8&database=projects%2Fai-tool-universe-bb584%2Fdatabases%2Fai-studio-aitooluniverse-ca2d8ed4-c1d9-47f2-ba27-62becb9a5950&gsessionid=S7WAW4Pv12-nsUHZiwCKsMB56KkMkn7uUDf0My4uabWO2fNeq4r8cw&SID=hRBbAejB8_jhRAsougaS3g&RID=83262&AID=6&zx=2alrkt33f0yg&t=1firestore.googleapis.com/google.fir... https://firestore.googleapis.com/google.firestore.v1.Firestore/Listen/channel?VER=8&database=projects%2Fai-tool-universe-bb584%2Fdatabases%2Fai-studio-aitooluniverse-ca2d8ed4-c1d9-47f2-ba27-62becb9a5950&gsessionid=S7WAW4Pv12-nsUHZiwCKsMB56KkMkn7uUDf0My4uabWO2fNeq4r8cw&SID=hRBbAejB8_jhRAsougaS3g&RID=83262&AID=6&zx=2alrkt33f0yg&t=1 — 200 — 49 B — 1.9 s — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
1 images, 3 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

3 KB

1 missing dimensions 1 missing lazy loading
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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