Performance

· 22 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

SEO

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

998 ms

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

1.89 s

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

336 ms

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

0.004

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

2.60 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.

3.78 s

Page Load Progression

469 ms

938 ms

1.4 s

1.9 s

2.3 s

2.8 s

3.3 s

3.8 s

Checks

7 PASS 6 REVIEW 6 FIX

Page Weight Budget

Action

11.7 MB transferred, 182 requests

FIX

11.7 MB transferred, 182 requests

Page weighs 17.5 MB (11.7 MB transferred)

Images are 1.5 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.5 MB

JavaScript is 1.1 MB — consider code splitting or lazy loading

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

Got: 1.1 MB

182 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 2.5 g CO2 per page load

11.7 MB transferred

182 requests

2.5 g CO2 per page load

Other 5.7 MiB 49%

Other 2.9 MiB 25%

Images 1.5 MiB 13%

JavaScript 1.1 MiB 9%

Fonts 199.5 KiB 2%

HTML 115.8 KiB 1%

CSS 111.7 KiB 1%

Other 33.8 KiB 0%

Other 23.6 KiB 0%

Other 2.1 KiB 0%

0 2.4 MB 4.9 MB

Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (11.7 MiB of 11.7 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

4050ms total JS execution

FIX

4050ms total JS execution

https://www.dr.dk/hydra/resources/_next/static/chu...: 1287ms CPU time

https://www.dr.dk/: 1176ms CPU time

Unattributable: 426ms CPU time

https://consent.cookiebot.com/uc.js?cbid=258095c6-...: 277ms CPU time

https://www.dr.dk/hydra/resources/_next/static/chu...: 208ms CPU time

Third-party scripts: 3624ms (89% of total)

Main Thread Breakdown

Script Evaluation 42% Other 23% Style & Layout 19% Rendering 8% Parse HTML & CSS 4% Script Parsing & Compilation 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.dr.dk/hydra/resources/_next/static/chunks/main-app-cf938d03eb22c849.js	1287ms	1019ms	15ms	3rd
https://www.dr.dk/	1176ms	17ms	14ms	3rd
Unattributable	426ms	23ms	0ms	1st
https://consent.cookiebot.com/uc.js?cbid=258095c6-67bb-4e09-8c33-4eda8f42c049&implementation=gtm&advertiserConsentMode=disabled	277ms	31ms	4ms	3rd
https://www.dr.dk/hydra/resources/_next/static/chunks/common-0fc2ed1f59e8ec66.js	208ms	96ms	39ms	3rd
https://www.dr.dk/tms/gtmp/tag.js?id=GTM-KCBPQTH&gtm_auth=Q9NGHPUfzKNV8SwAChk3Ng&gtm_preview=env-1&gtm_cookies_win=x	161ms	139ms	14ms	3rd
https://www.dr.dk/hydra/resources/_next/static/chunks/webpack-68b1f677c1fa5258.js	133ms	133ms	0ms	3rd
https://www.dr.dk/statisk/cep-banners/assets/templateSchema-CDtT7Dg8.js	122ms	67ms	24ms	3rd
https://consent.cookiebot.com/258095c6-67bb-4e09-8c33-4eda8f42c049/cc.js?renew=false&referer=www.dr.dk&dnt=false&init=false	103ms	44ms	10ms	3rd
https://www.dr.dk/statisk/dr-cookiedialog/bundle.js	98ms	84ms	14ms	3rd

Showing top 10 of 11 scripts

JS Bundles

Action

33 scripts, 555 KB unused

FIX

33 scripts, 555 KB unused

https://www.dr.dk/hydra/resources/_next/static/chu...: 168 KB unused (49%)

Consider code splitting or tree shaking to reduce unused code.

https://www.dr.dk/tms/gtmp/tag.js?id=GTM-KCBPQTH&g...: 59 KB unused (45%)

Consider code splitting or tree shaking to reduce unused code.

https://www.dr.dk/statisk/dr-cookiedialog/bundle.j...: 55 KB unused (41%)

Consider code splitting or tree shaking to reduce unused code.

https://www.dr.dk/statisk/cep-banners/assets/templ...: 45 KB unused (59%)

Consider code splitting or tree shaking to reduce unused code.

https://www.dr.dk/statisk/cep-banners/assets/templ...: 45 KB unused (59%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 555 KB

555 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.dr.dk/hydra/resources/_next/static/chunks/common-0fc2ed1f59e8ec66.js	343 KB	168 KB (49%)	✓	3rd
https://www.dr.dk/tms/gtmp/tag.js?id=GTM-KCBPQTH&gtm_auth=Q9NGHPUfzKNV8SwAChk3Ng&gtm_preview=env-1&gtm_cookies_win=x	131 KB	59 KB (45%)	✓	3rd
https://www.dr.dk/statisk/dr-cookiedialog/bundle.js	132 KB	55 KB (41%)	✓	3rd
https://www.dr.dk/statisk/cep-banners/assets/templateSchema-CDtT7Dg8.js	76 KB	45 KB (59%)	✓	3rd
https://www.dr.dk/statisk/cep-banners/assets/templateSchema-CDtT7Dg8.js	0 KB	45 KB (59%)	✓	3rd
https://www.dr.dk/statisk/cep-banners/assets/templateSchema-CDtT7Dg8.js	0 KB	45 KB (59%)	✓	3rd
https://www.dr.dk/statisk/cep-banners/assets/templateSchema-CDtT7Dg8.js	0 KB	45 KB (59%)	✓	3rd
https://consent.cookiebot.com/258095c6-67bb-4e09-8c33-4eda8f42c049/cc.js?renew=false&referer=www.dr.dk&dnt=false&init=false	101 KB	36 KB (36%)	✓	3rd
https://www.dr.dk/hydra/resources/_next/static/chunks/main-app-cf938d03eb22c849.js	98 KB	36 KB (37%)	✓	3rd
https://consent.cookiebot.com/uc.js?cbid=258095c6-67bb-4e09-8c33-4eda8f42c049&implementation=gtm&advertiserConsentMode=disabled	36 KB	23 KB (64%)	✓	3rd

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

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

Page Weight Inventory

Action

182 resources · 11.7 MB · 555 KB savings available

FIX

182 resources · 11.7 MB · 555 KB savings available

Page weight 11.7 MB exceeds 1 MB target by 10.7 MB

Got: 11.7 MB Expected: ≤ 1 MB

~555 KB of savings available

181 third-party resources (100% of weight)

10 resources over 200KB

182 resources · 11.7 MiB · 181 third-party 10.7 MiB over 1MB target

Media 74% · 8.7 MiB

Image 13% · 1.5 MiB

JavaScript 9% · 1.1 MiB

Font 2% · 199.5 KiB

Document 1% · 119.0 KiB

CSS 1% · 111.7 KiB

Other 0% · 33.2 KiB

~555.2 KiB of savings available

Remove unused JavaScript: 555.2 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

182 resources			11.7 MiB

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Image Optimization

43 images, 0 KB saveable

REVIEW

43 images, 0 KB saveable

https://www.dr.dk/statisk/dr-cookiedialog/images/c... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

43 images 1.5 MB

0 oversized -0 KB

19 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

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.

Compression Algorithm

Action

Main response served uncompressed

REVIEW

Main response served uncompressed

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.

Main HTML Cache-Control

No Cache-Control header on main HTML response

REVIEW

No Cache-Control header on main HTML response

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.

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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

13 fonts (199 KB)

PASS

13 fonts (199 KB)

13 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

199 KB total

Render-blocking

of 13

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

DRPublikUIVF-b49db5333d... woff2 swap

Size 136 KB

Load time 94 ms

Start 205 ms