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Contrast Checker

Check WCAG color contrast ratios between any two colors

Inspect HTTP response headers for any URL

Analyze SSL/TLS certificate details and chain

Look up DNS records for any domain

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Trace the full redirect chain for any URL

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Embed an auto-updating health score badge on your site

Performance

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

SCORE

76

GRADE

C

FIX

2

REVIEW

4

PASS

7

INFO

2

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

96

Performance

97

Accessibility

96

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.

708 ms

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

1.05 s

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

116 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.

978 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.

2.46 s

Page Load Progression

442 ms

883 ms

1.3 s

1.8 s

2.2 s

2.6 s

3.1 s

3.5 s

Checks

15

7 PASS 4 REVIEW 2 FIX

F

JS Bundles

Action

22 scripts, 569 KB unused

FIX

22 scripts, 569 KB unused

https://player-v2.yle.fi/143.8548a9a1553a1277bd33....: 251 KB unused (82%)

Consider code splitting or tree shaking to reduce unused code.

https://analytics-sdk.yle.fi/yle-analytics.min.js: 107 KB unused (77%)

Consider code splitting or tree shaking to reduce unused code.

https://yle.fi/ukko/assets/build/936.6d2bbdb591d6e...: 87 KB unused (43%)

Consider code splitting or tree shaking to reduce unused code.

https://player-v2.yle.fi/761.77dd3ec144e0d2e580a9....: 53 KB unused (65%)

Consider code splitting or tree shaking to reduce unused code.

https://yle.fi/ukko/assets/build/32.99c1de605179bf...: 36 KB unused (88%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 569 KB

569 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://player-v2.yle.fi/143.8548a9a1553a1277bd33.js	306 KB	251 KB (82%)	✓	3rd
https://analytics-sdk.yle.fi/yle-analytics.min.js	139 KB	107 KB (77%)	✓	3rd
https://yle.fi/ukko/assets/build/936.6d2bbdb591d6ec74301c.js	205 KB	87 KB (43%)	✓	1st
https://player-v2.yle.fi/761.77dd3ec144e0d2e580a9.js	82 KB	53 KB (65%)	✓	3rd
https://yle.fi/ukko/assets/build/32.99c1de605179bf9a3116.js	42 KB	36 KB (88%)	✓	1st
https://player-v2.yle.fi/embed.js	77 KB	34 KB (45%)	✓	3rd
https://yle.fi/ukko/assets/build/381.c51f0c03abe5bcd2240a.js	9 KB	—	✓	1st
https://yle.fi/ukko/assets/build/sp-3c733c89e9dc72c7431d.js	25 KB	—	✓	1st
https://yle.fi/ukko/assets/build/835.479a5a58c58e5f307f56.js	4 KB	—	✓	1st
https://yle.fi/ukko/assets/build/348.b2b9507e159c7c4c56f9.js	28 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

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

48 resources · 1.4 MB · 569 KB savings available

FIX

48 resources · 1.4 MB · 569 KB savings available

Page weight 408 KB over 1MB target

Got: 1.4 MB Expected: ≤ 1 MB

~569 KB of savings available

28 third-party resources (59% of weight)

2 resources over 200KB

48 resources · 1.4 MiB · 28 third-party 407.9 KiB over 1MB target

JavaScript 79% · 1.1 MiB

Font 8% · 114.0 KiB

Document 6% · 89.5 KiB

Image 6% · 80.2 KiB

CSS 0% · 6.1 KiB

Other 0% · 4.0 KiB

~569.5 KiB of savings available

Remove unused JavaScript: 569.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

48 resources			1.4 MiB

B

Page Weight Budget

1.4 MB transferred, 48 requests

REVIEW

1.4 MB transferred, 48 requests

Page weighs 4.4 MB (1.4 MB transferred)

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

48 HTTP requests

Estimated 0.29 g CO2 per page load

1.4 MB transferred

48 requests

0.29 g CO2 per page load

JavaScript 1.1 MiB 79%

Fonts 114.0 KiB 8%

HTML 89.5 KiB 6%

Images 77.7 KiB 5%

CSS 6.1 KiB 0%

Other 3.3 KiB 0%

Other 2.5 KiB 0%

Other 533 B 0%

Other 195 B 0%

Other 0 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

B

Third-Party Impact

59% third-party, 0 ms blocking

REVIEW

59% third-party, 0 ms blocking

Third-party code accounts for 59% of page weight (838.5 KiB of 1.4 MiB)

Third-party blocking time is low (0 ms)

41%

59%

First-party Third-party

C

JS Execution Cost

Action

1598ms total JS execution

REVIEW

1598ms total JS execution

https://yle.fi/: 713ms CPU time

https://yle.fi/ukko/assets/build/936.6d2bbdb591d6e...: 364ms CPU time

Unattributable: 157ms CPU time

https://yle.fi/ukko/assets/build/apm-rum-e95ed5cfe...: 93ms CPU time

https://player-v2.yle.fi/143.8548a9a1553a1277bd33....: 91ms CPU time

Third-party scripts: 355ms (22% of total)

Main Thread Breakdown

Script Evaluation 31% Other 29% Style & Layout 24% Rendering 9% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://yle.fi/	713ms	7ms	11ms	1st
https://yle.fi/ukko/assets/build/936.6d2bbdb591d6ec74301c.js	364ms	221ms	1ms	1st
Unattributable	157ms	16ms	0ms	3rd
https://yle.fi/ukko/assets/build/apm-rum-e95ed5cfe04f57d5e490.js	93ms	91ms	0ms	1st
https://player-v2.yle.fi/143.8548a9a1553a1277bd33.js	91ms	64ms	27ms	3rd
https://yle.fi/ukko/assets/build/sp-3c733c89e9dc72c7431d.js	73ms	12ms	2ms	1st
https://player-v2.yle.fi/embed.js	57ms	50ms	5ms	3rd
https://analytics-sdk.yle.fi/yle-analytics.min.js	51ms	37ms	13ms	3rd

C

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 compressed

All text resources are properly compressed.

A

Image Optimization

8 images, 0 KB saveable

PASS

8 images, 0 KB saveable

All images are well-optimized

8 images 78 KB

0 oversized -0 KB

3 legacy format

0 missing dimensions CLS risk

A+

Font Loading

2 fonts (114 KB)

PASS

2 fonts (114 KB)

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

Web fonts

2

114 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

YleNextVar.woff2 woff2 swap

Size 67 KB

Load time 61 ms

Start 56 ms

Risk FOUT — text flashes from fallback to web font

YleNextVar-Italic.woff2 woff2 swap

Size 47 KB

Load time 61 ms

Start 56 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

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+

HTTP Caching

max-age=30 (30 seconds)

PASS

max-age=30 (30 seconds)

Cache-Control header is set

Got: public, max-age=30

Effective TTL: 30 seconds (max-age=30)

ETag present — enables conditional (304) responses

Cache-Control

public, max-age=30

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	30	Cache for 30 seconds

Effective TTL: 30 seconds

Network Waterfall

48 requests over 1220ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

22% of JavaScript execution is third-party

First-party Third-party 355ms · 523KB · €4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	157ms	0 KB	—	€2/mo	Optional
player-v2.yle.fi player-v2.yle.fi	Other	91ms	306 KB	82%	€1/mo	Optional
player-v2.yle.fi player-v2.yle.fi	Other	57ms	77 KB	45%	€1/mo	Optional
analytics-sdk.yle.fi analytics-sdk.yle.fi	Other	51ms	139 KB	77%	€1/mo	Optional

Unattributable

Other

Optional

Execution 157ms

Transfer 0 KB

Monthly Cost €2/mo

player-v2.yle.fi

Other

Optional

Execution 91ms

Transfer 306 KB

Unused 82%

Monthly Cost €1/mo

player-v2.yle.fi

Other

Optional

Execution 57ms

Transfer 77 KB

Unused 45%

Monthly Cost €1/mo

analytics-sdk.yle.fi

Other

Optional

Execution 51ms

Transfer 139 KB

Unused 77%

Monthly Cost €1/mo

82% of player-v2.yle.fi'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

77% of analytics-sdk.yle.fi'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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