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Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
5
PASS
12
INFO
4

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.

599 ms

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

719 ms

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.

599 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.

719 ms

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
23
12 PASS 5 REVIEW 2 FIX
D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (80.7 KiB of 81.2 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
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
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
Document Compression
Action
Document response served uncompressed
REVIEW
Document 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
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
81 KB transferred, 11 requests
PASS
81 KB transferred, 11 requests
Info::
Page weighs 229 KB (81 KB transferred)
Info::
11 HTTP requests
Info::
Estimated 0.02 g CO2 per page load
81 KB / 2.4 MB budget
81 KB transferred
11 requests
0.02 g CO2 per page load
JavaScript 30.4 KiB 38%
HTML 23.5 KiB 29%
Other 16.0 KiB 20%
Images 9.8 KiB 12%
Other 1.4 KiB 2%
0 2.4 MB 4.9 MB
Under budget
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+
JS Execution Cost
199ms total JS execution
PASS
199ms total JS execution
Info::
https://adamnordling.se/: 148ms CPU time
Info::
Unattributable: 51ms CPU time
Warning::
Third-party scripts: 148ms (75% of total)

Main Thread Breakdown

Other 37% Style & Layout 36% Script Evaluation 15% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://adamnordling.se/148ms3ms0ms3rd
Unattributable51ms1ms0ms1st
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—✓3rd
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+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
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 · 81 KB · 0 KB savings available
PASS
11 resources · 81 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 81 KB
Warning::
10 third-party resources (99% of weight)
11 resources · 81.2 KiB · 10 third-party Within 1MB page-weight target
JavaScript 38% · 30.4 KiB
Document 32% · 25.9 KiB
Image 29% · 23.5 KiB
Other 2% · 1.4 KiB
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 455ms
INFO
0 ms 200 ms 400 ms 600 ms FCP 599 ms LCP 719 mshttps://www.adamnordling.se// https://www.adamnordling.se/ — 301 — 466 B — 49 ms — h3https://adamnordling.se/adamnordling.se/ https://adamnordling.se/ — 200 — 23.5 KiB — 135 ms — h3https://adamnordling.se/assets/profile-300.webpadamnordling.se/assets/profile-300.... https://adamnordling.se/assets/profile-300.webp — 200 — 5.3 KiB — 30 ms — h3https://adamnordling.se/assets/index-DtPcUuMe.jsadamnordling.se/assets/index-DtPcUu... https://adamnordling.se/assets/index-DtPcUuMe.js — 200 — 30.4 KiB — 34 ms — h3https://adamnordling.se/assets/svg/trajectory.svgadamnordling.se/assets/svg/trajecto... https://adamnordling.se/assets/svg/trajectory.svg — 200 — 1.3 KiB — 33 ms — h3https://adamnordling.se/assets/svg/nutrition.svgadamnordling.se/assets/svg/nutritio... https://adamnordling.se/assets/svg/nutrition.svg — 200 — 1.9 KiB — 36 ms — h3https://adamnordling.se/assets/svg/everything.svgadamnordling.se/assets/svg/everythi... https://adamnordling.se/assets/svg/everything.svg — 200 — 1.4 KiB — 35 ms — h3https://adamnordling.se/manifest.webmanifestadamnordling.se/manifest.webmanifes... https://adamnordling.se/manifest.webmanifest — 200 — 1.4 KiB — 81 ms — h3https://adamnordling.se/favicon.icoadamnordling.se/favicon.ico https://adamnordling.se/favicon.ico — 404 — 1.9 KiB — 35 ms — h3https://adamnordling.se/assets/favicons/favicon-32x32.pngadamnordling.se/assets/favicons/fav... https://adamnordling.se/assets/favicons/favicon-32x32.png — 200 — 2.5 KiB — 30 ms — h3https://adamnordling.se/assets/favicons/android-chrome-192x192.pngadamnordling.se/assets/favicons/and... https://adamnordling.se/assets/favicons/android-chrome-192x192.png — 200 — 11.2 KiB — 40 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
75% of JavaScript execution is third-party
First-party Third-party 148ms · 23KB · kr4/mo
adamnordling.se
Other
Optional
Execution 148ms
Transfer 23 KB
Monthly Cost kr4/mo

75% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

How third-party costs are calculated

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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