Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

100

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.34 s

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

3.58 s

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

402 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.

2.34 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.

3.58 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

21 PASS 2 REVIEW 1 FIX

JS Execution Cost

Action

2451ms total JS execution

FIX

2451ms total JS execution

https://everything.adamnordling.se/: 1097ms CPU time

https://everything.adamnordling.se/assets/index-Bw...: 969ms CPU time

Unattributable: 333ms CPU time

https://unpkg.com/leaflet@1.9.4/dist/leaflet.js: 52ms CPU time

Third-party scripts: 52ms (2% of total)

Main Thread Breakdown

Style & Layout 34% Script Evaluation 33% Other 21% Rendering 6% Parse HTML & CSS 5%

Script	Total	Scripting	Parse/Compile	Party
https://everything.adamnordling.se/	1097ms	23ms	1ms	1st
https://everything.adamnordling.se/assets/index-Bwy4ZsMr.js	969ms	671ms	1ms	1st
Unattributable	333ms	13ms	0ms	1st
https://unpkg.com/leaflet@1.9.4/dist/leaflet.js	52ms	35ms	16ms	3rd

Server-Timing Observability

No Server-Timing header found

REVIEW

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.

HTTP Caching

public, max-age=0, must-revalidate

REVIEW

public, max-age=0, must-revalidate

Cache-Control header is set

Got: public, max-age=0, must-revalidate

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

public, max-age=0, must-revalidate

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

A+

Page Weight Budget

182 KB transferred, 13 requests

PASS

182 KB transferred, 13 requests

Page weighs 525 KB (182 KB transferred)

13 HTTP requests

Estimated 0.04 g CO2 per page load

182 KB transferred

13 requests

0.04 g CO2 per page load

JavaScript 99.0 KiB 54%

Other 54.7 KiB 30%

HTML 19.7 KiB 11%

CSS 3.9 KiB 2%

Other 3.2 KiB 2%

Other 1.5 KiB 1%

Images 0 B 0%

0 2.4 MB 4.9 MB

Under budget

Third-Party Impact

27% third-party, 0 ms blocking

PASS

27% third-party, 0 ms blocking

Third-party code accounts for 27% of page weight (49.0 KiB of 181.9 KiB)

Third-party blocking time is low (0 ms)

73%

27%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Image Optimization

2 images, 0 KB saveable

PASS

2 images, 0 KB saveable

All images are well-optimized

2 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)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

JS Bundles

2 scripts, 35 KB unused

PASS

2 scripts, 35 KB unused

https://unpkg.com/leaflet@1.9.4/dist/leaflet.js: 35 KB unused (83%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 35 KB

35 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://unpkg.com/leaflet@1.9.4/dist/leaflet.js	42 KB	35 KB (83%)	✓	3rd
https://everything.adamnordling.se/assets/index-Bwy4ZsMr.js	57 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

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

3 hints, 0 missing preconnects

PASS

3 hints, 0 missing preconnects

Page uses 3 resource hint(s)

Current Resource Hints

preconnect

preload

—

dns-prefetch

—

prefetch

—

3 resource hints configured

A+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

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

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.

Asset Compression

1 of 1 asset host still on gzip

PASS

1 of 1 asset host still on gzip

unpkg.com serves assets with gzip; brotli would be ~20% smaller (assets: 3)

Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.

Got: unpkg.com (text/css)

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

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

Got: public, max-age=0, must-revalidate

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`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).

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

13 resources · 182 KB · 35 KB savings available

PASS

13 resources · 182 KB · 35 KB savings available

Within 1MB page-weight target

Got: 182 KB

8 third-party resources (27% of weight)

13 resources · 181.9 KiB · 8 third-party Within 1MB page-weight target

JavaScript 54% · 99.0 KiB

Image 30% · 54.7 KiB

Document 11% · 19.7 KiB

Other 3% · 4.7 KiB

CSS 2% · 3.9 KiB

~34.6 KiB of savings available

Remove unused JavaScript: 34.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

13 resources			181.9 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

1 render-blocking <script src> tag(s) without async/defer

Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

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

Network Waterfall

13 requests over 835ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

2% of JavaScript execution is third-party

First-party Third-party 52ms · 42KB · kr6/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
unpkg unpkg.com	CDN	52ms	42 KB	83%	kr6/mo	Optional

unpkg

CDN

Optional

Execution 52ms

Transfer 42 KB

Unused 83%

Monthly Cost kr6/mo

83% of unpkg's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

Image Optimization

1 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 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.