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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

Redirect Checker

Trace the full redirect chain for any URL

Real-user INP and Core Web Vitals from Google's Chrome UX Report.

RESTful API for programmatic website audits

Embed an auto-updating health score badge on your site

Performance

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

SCORE

85

GRADE

B

FIX

1

REVIEW

2

PASS

10

INFO

2

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

98

Performance

100

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.

837 ms

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

966 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.

0.036

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

837 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.

967 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

15

10 PASS 2 REVIEW 1 FIX

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 (865.6 KiB of 865.9 KiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

C

Image Optimization

Action

24 images, 0 KB saveable

REVIEW

24 images, 0 KB saveable

https://www.uio.no/forskning/forskningsnytt/artikl... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/om/aktuelt/universitetsplassen/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/bilder/circleu-theguild-logo.pn... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/forskning/forskningsnytt/apollo... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/om/aktuelt/universitetsplassen/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/om/aktuelt/arrangementer/andre/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/om/aktuelt/universitetsplassen/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/om/aktuelt/universitetsplassen/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/forskning/forskningsnytt/artikl... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.uio.no/om/aktuelt/universitetsplassen/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

24 images 597 KB

0 oversized -0 KB

24 legacy format

10 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

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

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

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

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

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

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

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

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

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

C

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A

Page Weight Budget

866 KB transferred, 51 requests

PASS

866 KB transferred, 51 requests

Page weighs 2.3 MB (866 KB transferred)

51 HTTP requests

Estimated 0.18 g CO2 per page load

866 KB transferred

51 requests

0.18 g CO2 per page load

Images 597.2 KiB 69%

JavaScript 154.8 KiB 18%

CSS 100.1 KiB 12%

HTML 8.5 KiB 1%

Other 2.8 KiB 0%

Other 1.6 KiB 0%

Other 1020 B 0%

0 2.4 MB 4.9 MB

Under budget

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+

JS Execution Cost

400ms total JS execution

PASS

400ms total JS execution

Unattributable: 149ms CPU time

https://www.uio.no/vrtx/dist/resources/uio2/js/jqu...: 128ms CPU time

https://www.uio.no/: 123ms CPU time

Third-party scripts: 400ms (100% of total)

Main Thread Breakdown

Other 36% Style & Layout 28% Script Evaluation 22% Parse HTML & CSS 8% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	149ms	5ms	0ms	3rd
https://www.uio.no/vrtx/dist/resources/uio2/js/jquery.min.js?x-h=1774601544824	128ms	68ms	4ms	3rd
https://www.uio.no/	123ms	6ms	1ms	3rd

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A

JS Bundles

22 scripts, 45 KB unused

PASS

22 scripts, 45 KB unused

https://www.uio.no/vrtx/dist/resources/uio2/js/uio...: 45 KB unused (76%)

Consider code splitting or tree shaking to reduce unused code.

https://vrtx.uio.no/js/analytics/v2/uioGa.js: unminified — 3 KB could be saved

Total unused JavaScript: 45 KB

45 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.uio.no/vrtx/dist/resources/uio2/js/uio2.js	59 KB	45 KB (76%)	✓	3rd
https://www.uio.no/vrtx/dist/resources/uio2/js/canvas.js	0 KB	—	✓	3rd
https://www.uio.no/vrtx/dist/resources/uio2/js/puzzel-chatbot.js	1 KB	—	✓	3rd
https://vrtx.uio.no/js/analytics/v2/uioGa.js	7 KB	—	✗	3rd
https://www.uio.no/vrtx/__vrtx/app-services/external-network.js	0 KB	—	✓	3rd
https://vrtx.uio.no/js/analytics/v2/www.uio.no/customTracker.js	1 KB	—	✓	3rd
https://www.uio.no/vrtx/__vrtx/app-services/internal-network.js	0 KB	—	✓	3rd
https://vrtx.uio.no/js/analytics/v3/analytics.js	25 KB	—	✓	3rd
https://www.uio.no/vrtx/dist/resources/uio2/js/big-project.js	1 KB	—	✓	3rd
https://www.uio.no/vrtx/dist/resources/uio2/js/studies.js	4 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

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

Page Weight Inventory

51 resources · 866 KB · 45 KB savings available

PASS

51 resources · 866 KB · 45 KB savings available

Within 1MB page-weight target

Got: 866 KB

50 third-party resources (100% of weight)

51 resources · 865.9 KiB · 50 third-party Within 1MB page-weight target

Image 69% · 598.5 KiB

JavaScript 18% · 155.8 KiB

CSS 12% · 100.1 KiB

Document 1% · 11.5 KiB

~44.7 KiB of savings available

Remove unused JavaScript: 44.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

51 resources			865.9 KiB

A

HTTP Caching

max-age=86400 (1 day)

PASS

max-age=86400 (1 day)

Cache-Control header is set

Got: max-age=86400, stale-while-revalidate=21600, stale-if-error=31536000

Effective TTL: 1 day (max-age=86400)

No ETag or Last-Modified header

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

Cache-Control

max-age=86400, stale-while-revalidate=21600, stale-if-error=31536000

Directive	Value	Meaning
max-age	86400	Cache for 1 day
stale-while-revalidate	21600	Serve stale for 6 hours while fetching fresh
stale-if-error	31536000

Effective TTL: 86400 seconds

Network Waterfall

51 requests over 665ms

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 400ms · 42KB · kr49/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	149ms	0 KB	—	kr18/mo	Optional
www.uio.no www.uio.no	Other	128ms	34 KB	—	kr16/mo	Optional
www.uio.no www.uio.no	Other	123ms	8 KB	—	kr15/mo	Optional

Unattributable

Other

Optional

Execution 149ms

Transfer 0 KB

Monthly Cost kr18/mo

www.uio.no

Other

Optional

Execution 128ms

Transfer 34 KB

Monthly Cost kr16/mo

www.uio.no

Other

Optional

Execution 123ms

Transfer 8 KB

Monthly Cost kr15/mo

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

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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