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https://cateno.app

Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
0
REVIEW
7
PASS
16
INFO
2

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

79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

3.80 s

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

3.97 s

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

32 ms

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.

3.80 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.

3.97 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
25
16 PASS 7 REVIEW
B
JS Execution Cost
811ms total JS execution
REVIEW
811ms total JS execution
Warning::
https://cateno.app/assets/index-DvGtPB46.js: 401ms CPU time
Warning::
https://cateno.app/: 253ms CPU time
Info::
Unattributable: 158ms CPU time
Info::
Third-party scripts: 158ms (19% of total)

Main Thread Breakdown

Other 36% Script Evaluation 30% Style & Layout 24% Rendering 8%
ScriptTotalScriptingParse/CompileParty
https://cateno.app/assets/index-DvGtPB46.js401ms228ms3ms1st
https://cateno.app/253ms3ms0ms1st
Unattributable158ms4ms0ms3rd
B
JS Bundles
3 scripts, 122 KB unused
REVIEW
3 scripts, 122 KB unused
Warning::
https://cateno.app/assets/index-DvGtPB46.js: 122 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 122 KB
122 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cateno.app/assets/index-DvGtPB46.js288 KB122 KB (43%)✓1st
https://cateno.app/_vercel/insights/script.js1 KB—✓1st
https://cateno.app/_vercel/speed-insights/script.js5 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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
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
379 KB transferred, 10 requests
PASS
379 KB transferred, 10 requests
Info::
Page weighs 1021 KB (379 KB transferred)
Info::
10 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
379 KB / 2.4 MB budget
379 KB transferred
10 requests
0.08 g CO2 per page load
JavaScript 294.6 KiB 78%
Fonts 73.7 KiB 19%
CSS 8.3 KiB 2%
HTML 1.0 KiB 0%
Other 858 B 0%
Other 152 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
20% third-party, 0 ms blocking
PASS
20% third-party, 0 ms blocking
Info::
Third-party code accounts for 20% of page weight (74.8 KiB of 378.7 KiB)
Info::
Third-party blocking time is low (0 ms)
80%
20%
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
2 fonts (74 KB)
PASS
2 fonts (74 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

74 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.8 s LCP 4.0 shttps://fonts.gstatic.com/s/playfairdisplay/v40/nuFiD-vYSZviVYUb_rj3ij__anPXDTzYgEM86xQ.woff2nuFiD-vYSZviVYUb_rj3ij_... https://fonts.gstatic.com/s/playfairdisplay/v40/nuFiD-vYSZviVYUb_rj3ij__anPXDTzYgEM86xQ.woff2 — 37.6 KiB — 124 ms — font-display: swaphttps://fonts.gstatic.com/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2rP2Yp2ywxg089UriI5-g4vl... https://fonts.gstatic.com/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2 — 36.1 KiB — 105 ms — font-display: swap
nuFiD-vYSZviVYUb_rj3ij_... woff2 swap
Size 38 KB
Load time 124 ms
Start 572 ms
Risk FOUT — text flashes from fallback to web font
rP2Yp2ywxg089UriI5-g4vl... woff2 swap
Size 36 KB
Load time 105 ms
Start 572 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+
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
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A+
Page Weight Inventory
10 resources · 379 KB · 122 KB savings available
PASS
10 resources · 379 KB · 122 KB savings available
Info::
Within 1MB page-weight target
Got: 379 KB
Info::
~122 KB of savings available
Info::
3 third-party resources (20% of weight)
Info::
1 resources over 200KB
10 resources · 378.7 KiB · 3 third-party Within 1MB page-weight target
JavaScript 78% · 294.6 KiB
Font 19% · 73.7 KiB
CSS 2% · 8.3 KiB
Document 0% · 1.0 KiB
Image 0% · 858 B
Other 0% · 152 B

~122.4 KiB of savings available

Remove unused JavaScript: 122.4 KiB
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+
JavaScript Blocking
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall
10 requests over 724ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.8 s LCP 4.0 shttps://cateno.app// https://cateno.app/ — 200 — 1.0 KiB — 89 ms — h2https://cateno.app/assets/index-DvGtPB46.js/assets/index-DvGtPB46.js https://cateno.app/assets/index-DvGtPB46.js — 200 — 288.4 KiB — 274 ms — h2https://cateno.app/assets/index-Cg3LxVI5.css/assets/index-Cg3LxVI5.css https://cateno.app/assets/index-Cg3LxVI5.css — 200 — 7.2 KiB — 272 ms — h2https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500&family=DM+Sans:wght@400;500&display=swapfonts.googleapis.com/css2?family=Pl... https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500&family=DM+Sans:wght@400;500&display=swap — 200 — 1.1 KiB — 155 ms — h2https://fonts.gstatic.com/s/playfairdisplay/v40/nuFiD-vYSZviVYUb_rj3ij__anPXDTzYgEM86xQ.woff2fonts.gstatic.com/s/playfairdisplay... https://fonts.gstatic.com/s/playfairdisplay/v40/nuFiD-vYSZviVYUb_rj3ij__anPXDTzYgEM86xQ.woff2 — 200 — 37.6 KiB — 124 ms — h3https://fonts.gstatic.com/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2fonts.gstatic.com/s/dmsans/v17/rP2Y... https://fonts.gstatic.com/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2 — 200 — 36.1 KiB — 105 ms — h3https://cateno.app/_vercel/insights/script.js/_vercel/insights/script.js https://cateno.app/_vercel/insights/script.js — 200 — 1.4 KiB — 39 ms — h2https://cateno.app/_vercel/speed-insights/script.js/_vercel/speed-insights/script.js https://cateno.app/_vercel/speed-insights/script.js — 200 — 4.9 KiB — 36 ms — h2https://cateno.app/favicon.svg/favicon.svg https://cateno.app/favicon.svg — 200 — 858 B — 146 ms — h2https://cateno.app/_vercel/insights/view/_vercel/insights/view https://cateno.app/_vercel/insights/view — 200 — 152 B — 54 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
19% of JavaScript execution is third-party
First-party Third-party 158ms · 0KB · $2/mo
Unattributable
Other
Optional
Execution 158ms
Transfer 0 KB
Monthly Cost $2/mo

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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