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Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
2
REVIEW
2
PASS
19
INFO
2

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

Mobile Desktop
0
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.

983 ms

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

0 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.

0.092

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

2.88 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.

0 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
25
19 PASS 2 REVIEW 2 FIX
D
JS Execution Cost
Action
2167ms total JS execution
FIX
2167ms total JS execution
Warning::
https://fortryd.dccenergi.dk/_next/static/chunks/2...: 605ms CPU time
Warning::
https://fortryd.dccenergi.dk/_next/static/chunks/2...: 460ms CPU time
Warning::
https://fortryd.dccenergi.dk/: 287ms CPU time
Warning::
Unattributable: 283ms CPU time
Info::
https://fortryd.dccenergi.dk/_next/static/chunks/3...: 201ms CPU time
Info::
Third-party scripts: 331ms (15% of total)

Main Thread Breakdown

Script Evaluation 59% Other 14% Script Parsing & Compilation 12% Style & Layout 9% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://fortryd.dccenergi.dk/_next/static/chunks/2bd1ef7c9fecba73.js605ms388ms29ms1st
https://fortryd.dccenergi.dk/_next/static/chunks/29b38998e6b762ae.js460ms325ms134ms1st
https://fortryd.dccenergi.dk/287ms6ms9ms1st
Unattributable283ms123ms0ms1st
https://fortryd.dccenergi.dk/_next/static/chunks/35aebc9d2d05aded.js201ms184ms14ms1st
https://www.googletagmanager.com/gtag/js?id=G-S08ZJFR64S&cx=c&gtm=4e67a1194ms150ms40ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KLJL8Z2W137ms106ms28ms3rd
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 730.0 KiB 93%
Fonts 29.2 KiB 4%
HTML 11.7 KiB 1%
CSS 10.6 KiB 1%
Other 970 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+
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 983 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 — 29.2 KiB — 128 ms — font-display: swap
8a4bb24664ac8500-s.p.12... woff2 swap
Size 29 KB
Load time 128 ms
Start 159 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+
JS Bundles
12 scripts, 0 KB unused
PASS
12 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
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/2bd1ef7c9fecba73.js69 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
https://fortryd.dccenergi.dk/_next/static/chunks/c3c6d293ae5c5fa9.js3 KB—✓1st
https://fortryd.dccenergi.dk/_next/static/chunks/29b38998e6b762ae.js318 KB—✓1st
https://fortryd.dccenergi.dk/_next/static/chunks/54ac4a9b070a751c.js4 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Warning::
1 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /_next/static/media/8a4bb24664ac8500-s.p.12264977.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
2
dns-prefetch
—
prefetch
—

2 resource hints configured

Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /_next/static/media/8a4bb24664ac8500-s.p.12264977.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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 · 0 KB savings available
PASS
17 resources · 783 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 783 KB
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% · 730.0 KiB
Font 4% · 29.2 KiB
Document 1% · 11.7 KiB
CSS 1% · 10.6 KiB
Image 0% · 970 B
Other 0% · 553 B
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
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
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
Info::
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
17 requests over 1272ms
INFO
0 ms 500 ms 1.0 s FCP 983 mshttps://fortryd.dccenergi.dk// https://fortryd.dccenergi.dk/ — 200 — 11.7 KiB — 152 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 — 29.2 KiB — 128 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 — 86 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 — 174 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 — 87 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/2bd1ef7c9fecba73.js/_next/static/chunks/2bd1ef7c9fecba... https://fortryd.dccenergi.dk/_next/static/chunks/2bd1ef7c9fecba73.js — 200 — 68.6 KiB — 169 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/35aebc9d2d05aded.js/_next/static/chunks/35aebc9d2d05ad... https://fortryd.dccenergi.dk/_next/static/chunks/35aebc9d2d05aded.js — 200 — 31.7 KiB — 188 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 — 108 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/ff27e7a1436a2d08.js/_next/static/chunks/ff27e7a1436a2d... https://fortryd.dccenergi.dk/_next/static/chunks/ff27e7a1436a2d08.js — 200 — 692 B — 178 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/e4fc6660cfa2921d.js/_next/static/chunks/e4fc6660cfa292... https://fortryd.dccenergi.dk/_next/static/chunks/e4fc6660cfa2921d.js — 200 — 8.3 KiB — 100 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/c3c6d293ae5c5fa9.js/_next/static/chunks/c3c6d293ae5c5f... https://fortryd.dccenergi.dk/_next/static/chunks/c3c6d293ae5c5fa9.js — 200 — 2.7 KiB — 171 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/29b38998e6b762ae.js/_next/static/chunks/29b38998e6b762... https://fortryd.dccenergi.dk/_next/static/chunks/29b38998e6b762ae.js — 200 — 317.8 KiB — 278 ms — h2https://fortryd.dccenergi.dk/_next/static/chunks/54ac4a9b070a751c.js/_next/static/chunks/54ac4a9b070a75... https://fortryd.dccenergi.dk/_next/static/chunks/54ac4a9b070a751c.js — 200 — 3.8 KiB — 88 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 — 264 ms — h2https://fortryd.dccenergi.dk/favicon.ico/favicon.ico https://fortryd.dccenergi.dk/favicon.ico — 200 — 970 B — 39 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 — 157 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-S08ZJFR64S&gtm=45je67a1v9255309182z89255280845za20gzb9255280845zd9255280845&_p=1784035574904&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=251835199.1784035575&frm=0&pscdl=noapi&rcb=17&sr=412x823&uaa=&uab=64&uafvl=Not%253BA%253DBrand%3B8.0.0.0%7CChromium%3B150.0.7871.114&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938469~118395333~118826209~118897920~118897930~119027224&sid=1784035575&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=1159region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-S08ZJFR64S&gtm=45je67a1v9255309182z89255280845za20gzb9255280845zd9255280845&_p=1784035574904&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=251835199.1784035575&frm=0&pscdl=noapi&rcb=17&sr=412x823&uaa=&uab=64&uafvl=Not%253BA%253DBrand%3B8.0.0.0%7CChromium%3B150.0.7871.114&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938469~118395333~118826209~118897920~118897930~119027224&sid=1784035575&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=1159 — 204 — 553 B — 112 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
15% of JavaScript execution is third-party
First-party Third-party 331ms · 277KB · kr26/mo
Google Tag Manager
Tag Manager
Optional
Execution 194ms
Transfer 159 KB
Monthly Cost kr15/mo
Google Tag Manager
Tag Manager
Optional
Execution 137ms
Transfer 118 KB
Monthly Cost kr11/mo

How third-party costs are calculated

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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