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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
97
GRADE
A+
FIX
0
REVIEW
4
PASS
19
INFO
3

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

Mobile Desktop
100
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.
96
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.

1.28 s

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.

0 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.

1.28 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.

1.28 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
26
19 PASS 4 REVIEW
B
JS Execution Cost
799ms total JS execution
REVIEW
799ms total JS execution
Warning::
https://adamnordling.se/: 600ms CPU time
Info::
Unattributable: 199ms CPU time

Main Thread Breakdown

Style & Layout 42% Other 35% Script Evaluation 9% Parse HTML & CSS 8% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://adamnordling.se/600ms18ms2ms1st
Unattributable199ms6ms0ms1st
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::
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
80 KB transferred, 10 requests
PASS
80 KB transferred, 10 requests
Info::
Page weighs 229 KB (80 KB transferred)
Info::
10 HTTP requests
Info::
Estimated 0.02 g CO2 per page load
80 KB / 2.4 MB budget
80 KB transferred
10 requests
0.02 g CO2 per page load
JavaScript 29.8 KiB 37%
HTML 23.5 KiB 29%
Other 15.6 KiB 19%
Images 9.6 KiB 12%
Other 1.4 KiB 2%
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
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 10 KB
0 oversized -0 KB
3 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+
JS Bundles
1 scripts, 0 KB unused
PASS
1 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://adamnordling.se/assets/index-DtPcUuMe.js30 KB—✓1st
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
10 resources · 80 KB · 0 KB savings available
PASS
10 resources · 80 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 80 KB
10 resources · 79.8 KiB · 0 third-party Within 1MB page-weight target
JavaScript 37% · 29.8 KiB
Document 32% · 25.5 KiB
Image 29% · 23.2 KiB
Other 2% · 1.4 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
10 requests over 402ms
INFO
0 ms 500 ms 1.0 s FCP 1.3 s LCP 1.3 shttps://adamnordling.se// https://adamnordling.se/ — 200 — 23.5 KiB — 114 ms — h2https://adamnordling.se/assets/profile-300.webp/assets/profile-300.webp https://adamnordling.se/assets/profile-300.webp — 200 — 5.0 KiB — 37 ms — h2https://adamnordling.se/assets/index-DtPcUuMe.js/assets/index-DtPcUuMe.js https://adamnordling.se/assets/index-DtPcUuMe.js — 200 — 29.8 KiB — 30 ms — h2https://adamnordling.se/assets/svg/trajectory.svg/assets/svg/trajectory.svg https://adamnordling.se/assets/svg/trajectory.svg — 200 — 1.3 KiB — 40 ms — h3https://adamnordling.se/assets/svg/nutrition.svg/assets/svg/nutrition.svg https://adamnordling.se/assets/svg/nutrition.svg — 200 — 1.9 KiB — 34 ms — h3https://adamnordling.se/assets/svg/everything.svg/assets/svg/everything.svg https://adamnordling.se/assets/svg/everything.svg — 200 — 1.4 KiB — 34 ms — h3https://adamnordling.se/manifest.webmanifest/manifest.webmanifest https://adamnordling.se/manifest.webmanifest — 200 — 1.4 KiB — 91 ms — h3https://adamnordling.se/favicon.ico/favicon.ico https://adamnordling.se/favicon.ico — 404 — 1.9 KiB — 31 ms — h3https://adamnordling.se/assets/favicons/favicon-32x32.png/assets/favicons/favicon-32x32.png https://adamnordling.se/assets/favicons/favicon-32x32.png — 200 — 2.5 KiB — 35 ms — h3https://adamnordling.se/assets/favicons/android-chrome-192x192.png/assets/favicons/android-chrome-192... https://adamnordling.se/assets/favicons/android-chrome-192x192.png — 200 — 11.2 KiB — 38 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
4 images, 5 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

4

Total Size

5 KB

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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