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Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
1
REVIEW
5
PASS
17
INFO
2

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

Mobile Desktop
98
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.
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.

1.87 s

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

2.02 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.

0.000

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

2.74 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.

2.02 s

Page Load Progression

456 ms
912 ms
1.4 s
1.8 s
2.3 s
2.7 s
3.2 s
3.6 s
Checks
25
17 PASS 5 REVIEW 1 FIX
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
JS Execution Cost
900ms total JS execution
REVIEW
900ms total JS execution
Warning::
https://usewebatlas.com/: 447ms CPU time
Warning::
https://usewebatlas.com/assets/index-6AKjjz-c.js: 289ms CPU time
Info::
Unattributable: 164ms CPU time

Main Thread Breakdown

Other 55% Script Evaluation 27% Style & Layout 13%
ScriptTotalScriptingParse/CompileParty
https://usewebatlas.com/447ms16ms3ms1st
https://usewebatlas.com/assets/index-6AKjjz-c.js289ms230ms2ms1st
Unattributable164ms8ms0ms1st
B
JS Bundles
8 scripts, 50 KB unused
REVIEW
8 scripts, 50 KB unused
Warning::
https://usewebatlas.com/assets/index-6AKjjz-c.js: 50 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 50 KB
50 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://usewebatlas.com/assets/index-6AKjjz-c.js123 KB50 KB (41%)✓1st
https://usewebatlas.com/assets/jsx-runtime-BKllkxft.js4 KB—✓1st
https://usewebatlas.com/assets/link-ClY_rr9w.js10 KB—✓1st
https://usewebatlas.com/assets/not-found-i5RsCZif.js0 KB—✓1st
https://usewebatlas.com/assets/ClientOnly-Cd5PtsYR.js0 KB—✓1st
https://usewebatlas.com/assets/catalog-yfngqDhl.js19 KB—✓1st
https://usewebatlas.com/assets/routes-BXG4hqxF.js3 KB—✓1st
https://usewebatlas.com/assets/atlas-ui-HEMrc-u9.js3 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
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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

A+
Page Weight Budget
215 KB transferred, 11 requests
PASS
215 KB transferred, 11 requests
Info::
Page weighs 685 KB (215 KB transferred)
Info::
11 HTTP requests
Info::
Estimated 0.04 g CO2 per page load
215 KB / 2.4 MB budget
215 KB transferred
11 requests
0.04 g CO2 per page load
JavaScript 162.2 KiB 75%
CSS 27.3 KiB 13%
Other 20.4 KiB 9%
HTML 5.6 KiB 3%
0 2.4 MB 4.9 MB
Under budget
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
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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
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
11 resources · 215 KB · 50 KB savings available
PASS
11 resources · 215 KB · 50 KB savings available
Info::
Within 1MB page-weight target
Got: 215 KB
Info::
~50 KB of savings available
11 resources · 215.5 KiB · 0 third-party Within 1MB page-weight target
JavaScript 75% · 162.2 KiB
CSS 13% · 27.3 KiB
Image 9% · 20.4 KiB
Document 3% · 5.6 KiB

~50.4 KiB of savings available

Remove unused JavaScript: 50.4 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
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
11 requests over 416ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.9 s LCP 2.0 shttps://usewebatlas.com// https://usewebatlas.com/ — 200 — 5.6 KiB — 109 ms — h2https://usewebatlas.com/assets/styles-BBaGfXQ4.css/assets/styles-BBaGfXQ4.css https://usewebatlas.com/assets/styles-BBaGfXQ4.css — 200 — 27.3 KiB — 88 ms — h2https://usewebatlas.com/assets/index-6AKjjz-c.js/assets/index-6AKjjz-c.js https://usewebatlas.com/assets/index-6AKjjz-c.js — 200 — 123.0 KiB — 87 ms — h2https://usewebatlas.com/assets/jsx-runtime-BKllkxft.js/assets/jsx-runtime-BKllkxft.js https://usewebatlas.com/assets/jsx-runtime-BKllkxft.js — 200 — 3.6 KiB — 88 ms — h2https://usewebatlas.com/assets/link-ClY_rr9w.js/assets/link-ClY_rr9w.js https://usewebatlas.com/assets/link-ClY_rr9w.js — 200 — 10.2 KiB — 54 ms — h2https://usewebatlas.com/assets/not-found-i5RsCZif.js/assets/not-found-i5RsCZif.js https://usewebatlas.com/assets/not-found-i5RsCZif.js — 200 — 448 B — 45 ms — h2https://usewebatlas.com/assets/ClientOnly-Cd5PtsYR.js/assets/ClientOnly-Cd5PtsYR.js https://usewebatlas.com/assets/ClientOnly-Cd5PtsYR.js — 200 — 506 B — 87 ms — h2https://usewebatlas.com/assets/catalog-yfngqDhl.js/assets/catalog-yfngqDhl.js https://usewebatlas.com/assets/catalog-yfngqDhl.js — 200 — 19.0 KiB — 88 ms — h2https://usewebatlas.com/assets/routes-BXG4hqxF.js/assets/routes-BXG4hqxF.js https://usewebatlas.com/assets/routes-BXG4hqxF.js — 200 — 2.8 KiB — 88 ms — h2https://usewebatlas.com/assets/atlas-ui-HEMrc-u9.js/assets/atlas-ui-HEMrc-u9.js https://usewebatlas.com/assets/atlas-ui-HEMrc-u9.js — 200 — 2.6 KiB — 88 ms — h2https://usewebatlas.com/favicon.ico/favicon.ico https://usewebatlas.com/favicon.ico — 200 — 20.4 KiB — 51 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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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