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Performance

· 20 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
2
REVIEW
2
PASS
15
INFO
1

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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
66
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.

260 ms

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

427 ms

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

11 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.050

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

549 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.

467 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
20
15 PASS 2 REVIEW 2 FIX
D
JS Bundles
Action
12 scripts, 317 KB unused
FIX
12 scripts, 317 KB unused
Warning::
https://fortryd.dccenergi.dk/_next/static/chunks/2...: 161 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S08Z...: 68 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KLJ...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fortryd.dccenergi.dk/_next/static/chunks/2...: 25 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 317 KB
317 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://fortryd.dccenergi.dk/_next/static/chunks/29b38998e6b762ae.js318 KB161 KB (51%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-S08ZJFR64S&cx=c&gtm=4e67a1159 KB68 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KLJL8Z2W118 KB63 KB (54%)✓3rd
https://fortryd.dccenergi.dk/_next/static/chunks/2bd1ef7c9fecba73.js69 KB25 KB (36%)✓1st
https://fortryd.dccenergi.dk/_next/static/chunks/fcb9801dd6f392ed.js7 KB—✓1st
https://fortryd.dccenergi.dk/_next/static/chunks/b963f79b51802f68.js9 KB—✓1st
https://fortryd.dccenergi.dk/_next/static/chunks/35aebc9d2d05aded.js32 KB—✓1st
https://fortryd.dccenergi.dk/_next/static/chunks/turbopack-f6ebbba63f866f15.js4 KB—✓1st
https://fortryd.dccenergi.dk/_next/static/chunks/ff27e7a1436a2d08.js1 KB—✓1st
https://fortryd.dccenergi.dk/_next/static/chunks/e4fc6660cfa2921d.js8 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

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

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

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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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.
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.
A
Page Weight Budget
783 KB transferred, 17 requests
PASS
783 KB transferred, 17 requests
Info::
Page weighs 2.6 MB (783 KB transferred)
Warning::
JavaScript is 730 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 730 KB
Info::
17 HTTP requests
Info::
Estimated 0.16 g CO2 per page load
783 KB / 2.4 MB budget
783 KB transferred
17 requests
0.16 g CO2 per page load
JavaScript 730.1 KiB 93%
Fonts 29.1 KiB 4%
HTML 11.8 KiB 2%
CSS 10.6 KiB 1%
Other 989 B 0%
Other 553 B 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

A
Third-Party Impact
35% third-party, 0 ms blocking
PASS
35% third-party, 0 ms blocking
Info::
Third-party code accounts for 35% of page weight (277.5 KiB of 783.0 KiB)
Info::
Third-party blocking time is low (0 ms)
65%
35%
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+
JS Execution Cost
313ms total JS execution
PASS
313ms total JS execution
Info::
https://fortryd.dccenergi.dk/_next/static/chunks/2...: 152ms CPU time
Info::
https://fortryd.dccenergi.dk/: 104ms CPU time
Info::
Unattributable: 57ms CPU time

Main Thread Breakdown

Script Evaluation 51% Script Parsing & Compilation 16% Other 16% Style & Layout 11% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://fortryd.dccenergi.dk/_next/static/chunks/2bd1ef7c9fecba73.js152ms121ms10ms1st
https://fortryd.dccenergi.dk/104ms2ms4ms1st
Unattributable57ms20ms0ms1st
A+
Font Loading
1 fonts (29 KB)
PASS
1 fonts (29 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

29 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 260 ms LCP 427 mshttps://fortryd.dccenergi.dk/_next/static/media/8a4bb24664ac8500-s.p.12264977.woff28a4bb24664ac8500-s.p.12... https://fortryd.dccenergi.dk/_next/static/media/8a4bb24664ac8500-s.p.12264977.woff2 — 29.1 KiB — 36 ms — font-display: swap
8a4bb24664ac8500-s.p.12... woff2 swap
Size 29 KB
Load time 36 ms
Start 215 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+
Compression Algorithm
Main response uses brotli
PASS
Main 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 uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-cache, no-store, 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: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch,...
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
17 resources · 783 KB · 317 KB savings available
PASS
17 resources · 783 KB · 317 KB savings available
Info::
Within 1MB page-weight target
Got: 783 KB
Info::
~317 KB of savings available
Info::
3 third-party resources (35% of weight)
Info::
1 resources over 200KB
17 resources · 783.0 KiB · 3 third-party Within 1MB page-weight target
JavaScript 93% · 730.1 KiB
Font 4% · 29.1 KiB
Document 2% · 11.8 KiB
CSS 1% · 10.6 KiB
Image 0% · 989 B
Other 0% · 553 B

~317.5 KiB of savings available

Remove unused JavaScript: 317.5 KiB
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
17 requests over 1096ms
INFO
0 ms 500 ms 1.0 s FCP 260 ms LCP 427 mshttps://fortryd.dccenergi.dk// https://fortryd.dccenergi.dk/ — 200 — 11.8 KiB — 220 ms — h2https://fortryd.dccenergi.dk/_next/static/media/8a4bb24664ac8500-s.p.12264977.woff2/_next/static/media/8a4bb24664ac850... https://fortryd.dccenergi.dk/_next/static/media/8a4bb24664ac8500-s.p.12264977.woff2 — 200 — 29.1 KiB — 36 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/3cdafb63614647d4.css/_next/static/chunks/3cdafb63614647... https://fortryd.dccenergi.dk/_next/static/chunks/3cdafb63614647d4.css — 200 — 10.6 KiB — 33 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/fcb9801dd6f392ed.js/_next/static/chunks/fcb9801dd6f392... https://fortryd.dccenergi.dk/_next/static/chunks/fcb9801dd6f392ed.js — 200 — 6.7 KiB — 33 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/b963f79b51802f68.js/_next/static/chunks/b963f79b51802f... https://fortryd.dccenergi.dk/_next/static/chunks/b963f79b51802f68.js — 200 — 8.5 KiB — 37 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/2bd1ef7c9fecba73.js/_next/static/chunks/2bd1ef7c9fecba... https://fortryd.dccenergi.dk/_next/static/chunks/2bd1ef7c9fecba73.js — 200 — 68.8 KiB — 62 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/35aebc9d2d05aded.js/_next/static/chunks/35aebc9d2d05ad... https://fortryd.dccenergi.dk/_next/static/chunks/35aebc9d2d05aded.js — 200 — 32.4 KiB — 58 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/turbopack-f6ebbba63f866f15.js/_next/static/chunks/turbopack-f6eb... https://fortryd.dccenergi.dk/_next/static/chunks/turbopack-f6ebbba63f866f15.js — 200 — 4.2 KiB — 61 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/ff27e7a1436a2d08.js/_next/static/chunks/ff27e7a1436a2d... https://fortryd.dccenergi.dk/_next/static/chunks/ff27e7a1436a2d08.js — 200 — 531 B — 60 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/e4fc6660cfa2921d.js/_next/static/chunks/e4fc6660cfa292... https://fortryd.dccenergi.dk/_next/static/chunks/e4fc6660cfa2921d.js — 200 — 7.6 KiB — 60 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/c3c6d293ae5c5fa9.js/_next/static/chunks/c3c6d293ae5c5f... https://fortryd.dccenergi.dk/_next/static/chunks/c3c6d293ae5c5fa9.js — 200 — 2.0 KiB — 60 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/54ac4a9b070a751c.js/_next/static/chunks/54ac4a9b070a75... https://fortryd.dccenergi.dk/_next/static/chunks/54ac4a9b070a751c.js — 200 — 4.5 KiB — 61 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/29b38998e6b762ae.js/_next/static/chunks/29b38998e6b762... https://fortryd.dccenergi.dk/_next/static/chunks/29b38998e6b762ae.js — 200 — 317.9 KiB — 83 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KLJL8Z2Wwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KLJL8Z2W — 200 — 117.6 KiB — 252 ms — h2https://fortryd.dccenergi.dk/favicon.ico/favicon.ico https://fortryd.dccenergi.dk/favicon.ico — 200 — 989 B — 43 ms — h2https://www.googletagmanager.com/gtag/js?id=G-S08ZJFR64S&cx=c&gtm=4e67a1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-S08ZJFR64S&cx=c&gtm=4e67a1 — 200 — 159.4 KiB — 152 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-S08ZJFR64S&gtm=45je67a1v9255309182z89255280845za20gzb9255280845zd9255280845&_p=1784035588989&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1719166477.1784035590&frm=0&pscdl=noapi&rcb=2&sr=800x600&uaa=x86&uab=64&uafvl=Not%253BA%253DBrand%3B8.0.0.0%7CChromium%3B150.0.7871.114&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938468~118826209~118897920~118897930~119027224~119724322&sid=1784035589&sct=1&seg=0&dl=https%3A%2F%2Ffortryd.dccenergi.dk%2F&dt=Fortryd%20DCC%20Energi-aftale%20nemt%20online&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1021region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-S08ZJFR64S&gtm=45je67a1v9255309182z89255280845za20gzb9255280845zd9255280845&_p=1784035588989&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1719166477.1784035590&frm=0&pscdl=noapi&rcb=2&sr=800x600&uaa=x86&uab=64&uafvl=Not%253BA%253DBrand%3B8.0.0.0%7CChromium%3B150.0.7871.114&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938468~118826209~118897920~118897930~119027224~119724322&sid=1784035589&sct=1&seg=0&dl=https%3A%2F%2Ffortryd.dccenergi.dk%2F&dt=Fortryd%20DCC%20Energi-aftale%20nemt%20online&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1021 — 204 — 553 B — 74 ms — h2
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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