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Contrast Checker

Check WCAG color contrast ratios between any two colors

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https://expressen.se

Performance

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

SCORE

69

GRADE

D

FIX

4

REVIEW

2

PASS

7

INFO

2

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

91

Performance

84

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.

1.11 s

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

1.36 s

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

46 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.

1.94 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.

2.77 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

15

7 PASS 2 REVIEW 4 FIX

F

Page Weight Budget

Action

3.7 MB transferred, 166 requests

FIX

3.7 MB transferred, 166 requests

Page weighs 13.6 MB (3.7 MB transferred)

JavaScript is 1.2 MB — consider code splitting or lazy loading

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

Got: 1.2 MB

166 HTTP requests — consider bundling or reducing

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

Estimated 0.77 g CO2 per page load

3.7 MB transferred

166 requests

0.77 g CO2 per page load

JavaScript 1.2 MiB 34%

Other 1.1 MiB 31%

Images 890.6 KiB 24%

Other 158.7 KiB 4%

HTML 104.2 KiB 3%

Fonts 95.5 KiB 3%

CSS 62.1 KiB 2%

Other 24.8 KiB 1%

Other 8.7 KiB 0%

0 2.4 MB 4.9 MB

Over 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

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

D

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 (3.7 MiB of 3.7 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

F

JS Bundles

Action

59 scripts, 638 KB unused

FIX

59 scripts, 638 KB unused

https://static.bonniernews.se/video-player/assets/...: 176 KB unused (61%)

Consider code splitting or tree shaking to reduce unused code.

https://securepubads.g.doubleclick.net/pagead/mana...: 141 KB unused (75%)

Consider code splitting or tree shaking to reduce unused code.

https://imasdk.googleapis.com/js/sdkloader/ima3.js: 110 KB unused (76%)

Consider code splitting or tree shaking to reduce unused code.

https://micro.rubiconproject.com/prebid/dynamic/12...: 83 KB unused (56%)

Consider code splitting or tree shaking to reduce unused code.

https://tracking.expressen.se/gtm.js?id=GTM-MQ5CW3...: 62 KB unused (49%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 638 KB

638 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://static.bonniernews.se/video-player/assets/js/main.min_1d01c7b4f9e2fcca6d8679dd54e11e8a.js	289 KB	176 KB (61%)	✓	3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31098007	188 KB	141 KB (75%)	✓	3rd
https://imasdk.googleapis.com/js/sdkloader/ima3.js	146 KB	110 KB (76%)	✓	3rd
https://micro.rubiconproject.com/prebid/dynamic/12954.js	149 KB	83 KB (56%)	✓	3rd
https://tracking.expressen.se/gtm.js?id=GTM-MQ5CW3S&l=dl1756283352564	127 KB	62 KB (49%)	✓	3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js	102 KB	44 KB (44%)	✓	3rd
https://assets.bonad.io/bundles/bad.js	25 KB	22 KB (87%)	✓	3rd
blob:https://www.expressen.se/0bb1a06b-84de-4847-a4ff-2e444f2c5f20	-0 KB	—	✓	3rd
blob:https://www.expressen.se/1632b326-7948-4fde-bae5-94ac46263f71	-0 KB	—	✓	3rd
https://static.bonniernews.se/bundles/expressen/scripts/main.desktop_74bfc5ebaf8d450ea453f1c63da796a6.js	22 KB	—	✓	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

F

Page Weight Inventory

Action

166 resources · 3.7 MB · 638 KB savings available

FIX

166 resources · 3.7 MB · 638 KB savings available

Page weight 2.7 MB over 1MB target

Got: 3.7 MB Expected: ≤ 1 MB

~638 KB of savings available

165 third-party resources (100% of weight)

1 resources over 200KB

166 resources · 3.7 MiB · 165 third-party 2.7 MiB over 1MB target

JavaScript 34% · 1.2 MiB

Media 30% · 1.1 MiB

Image 24% · 892.3 KiB

Other 5% · 200.0 KiB

Document 3% · 104.4 KiB

Font 3% · 95.5 KiB

CSS 2% · 62.1 KiB

~638.4 KiB of savings available

Remove unused JavaScript: 638.4 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

166 resources			3.7 MiB

B

Image Optimization

56 images, 0 KB saveable

REVIEW

56 images, 0 KB saveable

All images are well-optimized

56 images 891 KB

0 oversized -0 KB

46 legacy format

0 missing dimensions CLS risk

C

JS Execution Cost

Action

1734ms total JS execution

REVIEW

1734ms total JS execution

https://static.bonniernews.se/video-player/assets/...: 624ms CPU time

Unattributable: 426ms CPU time

https://www.expressen.se/: 304ms CPU time

https://static.bonniernews.se/bundles/expressen/sc...: 80ms CPU time

https://sdk.privacy-center.org/sdk/22ecd6bfac93de6...: 77ms CPU time

Third-party scripts: 1734ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 27% Style & Layout 17% Script Parsing & Compilation 5% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://static.bonniernews.se/video-player/assets/js/main.min_1d01c7b4f9e2fcca6d8679dd54e11e8a.js	624ms	463ms	23ms	3rd
Unattributable	426ms	52ms	0ms	3rd
https://www.expressen.se/	304ms	19ms	2ms	3rd
https://static.bonniernews.se/bundles/expressen/scripts/main.desktop_74bfc5ebaf8d450ea453f1c63da796a6.js	80ms	15ms	2ms	3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js	77ms	59ms	10ms	3rd
https://tracking.expressen.se/gtm.js?id=GTM-MQ5CW3S&l=dl1756283352564	62ms	46ms	14ms	3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31098007	57ms	37ms	11ms	3rd
https://micro.rubiconproject.com/prebid/dynamic/12954.js	54ms	42ms	11ms	3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-sv-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js	50ms	19ms	5ms	3rd

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

4 fonts (96 KB)

PASS

4 fonts (96 KB)

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

Web fonts

4

96 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

siri-black-condensed.woff2 woff2 swap

Size 24 KB

Load time 106 ms

Start 240 ms

Risk FOUT — text flashes from fallback to web font

inter-variable-subset.w... woff2 swap

Size 43 KB

Load time 104 ms

Start 241 ms

Risk FOUT — text flashes from fallback to web font

siri-headline-medium-co... woff2 swap

Size 23 KB

Load time 26 ms

Start 399 ms

Risk FOUT — text flashes from fallback to web font

font-woff;charset=utf-8... woff swap

Size 5 KB

Load time 113 ms

Start 1.2 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

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)

Fixing the unchecked items could save ~2 KB and ~4 ms

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

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

A

HTTP Caching

max-age=10 (10 seconds)

PASS

max-age=10 (10 seconds)

Cache-Control header is set

Got: max-age=10

Effective TTL: 10 seconds (max-age=10)

No ETag or Last-Modified header

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

Cache-Control

max-age=10

Directive	Value	Meaning
max-age	10	Cache for 10 seconds

Effective TTL: 10 seconds

Network Waterfall

166 requests over 1982ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

100% of JavaScript execution is third-party

First-party Third-party 1734ms · 1030KB · kr105/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
static.bonniernews.se static.bonniernews.se	Other	624ms	289 KB	61%	kr38/mo	Costly
Unattributable Unattributable	Other	426ms	0 KB	—	kr26/mo	Costly
www.expressen.se www.expressen.se	Other	304ms	100 KB	—	kr18/mo	Costly
static.bonniernews.se static.bonniernews.se	Other	80ms	22 KB	—	kr5/mo	Optional
sdk.privacy-center.org sdk.privacy-center.org	Other	77ms	102 KB	44%	kr5/mo	Optional
tracking.expressen.se tracking.expressen.se	Other	62ms	127 KB	49%	kr4/mo	Optional
securepubads.g.doubleclick.net securepubads.g.doubleclick.net	Other	57ms	188 KB	75%	kr3/mo	Optional
micro.rubiconproject.com micro.rubiconproject.com	Other	54ms	149 KB	56%	kr3/mo	Optional
sdk.privacy-center.org sdk.privacy-center.org	Other	50ms	53 KB	—	kr3/mo	Optional

static.bonniernews.se

Other

Costly

Execution 624ms

Transfer 289 KB

Unused 61%

Monthly Cost kr38/mo

Unattributable

Other

Costly

Execution 426ms

Transfer 0 KB

Monthly Cost kr26/mo

www.expressen.se

Other

Costly

Execution 304ms

Transfer 100 KB

Monthly Cost kr18/mo

static.bonniernews.se

Other

Optional

Execution 80ms

Transfer 22 KB

Monthly Cost kr5/mo

sdk.privacy-center.org

Other

Optional

Execution 77ms

Transfer 102 KB

Unused 44%

Monthly Cost kr5/mo

tracking.expressen.se

Other

Optional

Execution 62ms

Transfer 127 KB

Unused 49%

Monthly Cost kr4/mo

securepubads.g.doubleclick.net

Other

Optional

Execution 57ms

Transfer 188 KB

Unused 75%

Monthly Cost kr3/mo

micro.rubiconproject.com

Other

Optional

Execution 54ms

Transfer 149 KB

Unused 56%

Monthly Cost kr3/mo

sdk.privacy-center.org

Other

Optional

Execution 50ms

Transfer 53 KB

Monthly Cost kr3/mo

These scripts may cost more than they're worth

static.bonniernews.se adds 624ms and costs ~kr38/month
Unattributable adds 426ms and costs ~kr26/month
www.expressen.se adds 304ms and costs ~kr18/month

100% 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

static.bonniernews.se takes 624ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

61% of static.bonniernews.se'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

Unattributable takes 426ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.expressen.se takes 304ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

75% of securepubads.g.doubleclick.net'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

56% of micro.rubiconproject.com'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

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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