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Step-by-step guides for moving between web technologies

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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

75

GRADE

C

FIX

4

REVIEW

2

PASS

7

INFO

2

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

55

Performance

89

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.

811 ms

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

2.73 s

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

275 ms

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

0.300

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

1.92 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.

2.73 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

D

Third-Party Impact

Action

96% third-party, 0 ms blocking

FIX

96% third-party, 0 ms blocking

Third-party code accounts for 96% of page weight (1.6 MiB of 1.7 MiB)

Third-party blocking time is low (0 ms)

96%

First-party Third-party

D

JS Bundles

Action

57 scripts, 479 KB unused

FIX

57 scripts, 479 KB unused

https://abs.twimg.com/responsive-web/client-web/ma...: 147 KB unused (51%)

Consider code splitting or tree shaking to reduce unused code.

https://abs.twimg.com/responsive-web/client-web/ve...: 102 KB unused (30%)

Consider code splitting or tree shaking to reduce unused code.

https://abs.twimg.com/responsive-web/client-web/mo...: 75 KB unused (99%)

Consider code splitting or tree shaking to reduce unused code.

https://accounts.google.com/gsi/client: 68 KB unused (72%)

Consider code splitting or tree shaking to reduce unused code.

https://abs.twimg.com/responsive-web/client-web/i1...: 42 KB unused (23%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 479 KB

479 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://abs.twimg.com/responsive-web/client-web/main.52d81e4a.js	287 KB	147 KB (51%)	✓	3rd
https://abs.twimg.com/responsive-web/client-web/vendor.7ef16aaa.js	346 KB	102 KB (30%)	✓	3rd
https://abs.twimg.com/responsive-web/client-web/modules.audio.184d9faa.js	76 KB	75 KB (99%)	✓	3rd
https://accounts.google.com/gsi/client	96 KB	68 KB (72%)	✓	3rd
https://abs.twimg.com/responsive-web/client-web/i18n/en.f19ad19a.js	180 KB	42 KB (23%)	✓	3rd
https://abs.twimg.com/responsive-web/client-web/loader.AppModules.219d882a.js	33 KB	25 KB (75%)	✓	3rd
https://abs.twimg.com/responsive-web/client-web/shared~bundle.AudioSpaceDetail~bundle.AudioSpaceDiscovery~bundle.AudioSpacebarScreen~bundle.Birdwatch~bundle..2150637a.js	23 KB	20 KB (90%)	✓	3rd
https://abs.twimg.com/responsive-web/client-web/icons.29.93c0a75a.js	7 KB	—	✓	3rd
https://abs.twimg.com/responsive-web/client-web/icons.10.f9bc985a.js	5 KB	—	✓	3rd
https://abs.twimg.com/responsive-web/client-web/bundle.LoggedOutHome.888e533a.js	7 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

76 resources · 1.7 MB · 479 KB savings available

FIX

76 resources · 1.7 MB · 479 KB savings available

Page weight 738 KB over 1MB target

Got: 1.7 MB Expected: ≤ 1 MB

~479 KB of savings available

74 third-party resources (96% of weight)

2 resources over 200KB

76 resources · 1.7 MiB · 74 third-party 737.7 KiB over 1MB target

JavaScript 85% · 1.5 MiB

Font 10% · 171.5 KiB

Document 4% · 65.5 KiB

Other 1% · 17.9 KiB

Image 0% · 5.6 KiB

CSS 0% · 642 B

~479.5 KiB of savings available

Remove unused JavaScript: 479.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

76 resources			1.7 MiB

D

HTTP Caching

Action

no-store (uncacheable)

FIX

no-store (uncacheable)

Cache-Control: no-store prevents all caching

Intentional for dynamic content, but increases server load for every page view.

Got: no-cache, no-store, must-revalidate, pre-check=0, post-check=0

Last-Modified header present

Cache-Control

no-cache, no-store, must-revalidate, pre-check=0, post-check=0

Directive	Value	Meaning
no-cache	—	Cache but always revalidate first
no-store	—	Never cache this response
must-revalidate	—	Must recheck with server after expiry
pre-check	0
post-check	0

C

Page Weight Budget

Action

1.7 MB transferred, 76 requests

REVIEW

1.7 MB transferred, 76 requests

Page weighs 5.5 MB (1.7 MB transferred)

JavaScript is 1.5 MB — consider code splitting or lazy loading

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

Got: 1.5 MB

76 HTTP requests

Estimated 0.36 g CO2 per page load

1.7 MB transferred

76 requests

0.36 g CO2 per page load

JavaScript 1.5 MiB 85%

Fonts 171.5 KiB 10%

HTML 65.5 KiB 4%

Other 10.1 KiB 1%

Other 7.9 KiB 0%

Other 4.8 KiB 0%

Images 752 B 0%

CSS 642 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Approaching limit

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

C

JS Execution Cost

Action

1129ms total JS execution

REVIEW

1129ms total JS execution

https://abs.twimg.com/responsive-web/client-web/ma...: 704ms CPU time

https://abs.twimg.com/responsive-web/client-web/ve...: 338ms CPU time

Unattributable: 87ms CPU time

Third-party scripts: 1129ms (100% of total)

Main Thread Breakdown

Script Evaluation 78% Script Parsing & Compilation 9% Other 8%

Script	Total	Scripting	Parse/Compile	Party
https://abs.twimg.com/responsive-web/client-web/main.52d81e4a.js	704ms	649ms	20ms	3rd
https://abs.twimg.com/responsive-web/client-web/vendor.7ef16aaa.js	338ms	274ms	29ms	3rd
Unattributable	87ms	9ms	0ms	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+

Image Optimization

3 images, 0 KB saveable

PASS

3 images, 0 KB saveable

All images are well-optimized

3 images 1 KB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

4 fonts (172 KB)

PASS

4 fonts (172 KB)

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

Web fonts

4

172 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

Chirp-Regular.80fda27a.... woff2 swap

Size 44 KB

Load time 153 ms

Start 189 ms

Risk FOUT — text flashes from fallback to web font

Chirp-Bold.ebb56aba.woff2 woff2 swap

Size 44 KB

Load time 151 ms

Start 189 ms

Risk FOUT — text flashes from fallback to web font

Chirp-Medium.f8e2739a.w... woff2 swap

Size 44 KB

Load time 150 ms

Start 189 ms

Risk FOUT — text flashes from fallback to web font

chirp-extended-heavy-we... woff2 swap

Size 39 KB

Load time 37 ms

Start 1.6 s

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+

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

76 requests over 1939ms

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 1129ms · 633KB · €12/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
abs.twimg.com abs.twimg.com	Other	704ms	287 KB	51%	€8/mo	Costly
abs.twimg.com abs.twimg.com	Other	338ms	346 KB	30%	€4/mo	Costly
Unattributable Unattributable	Other	87ms	0 KB	—	€1/mo	Optional

abs.twimg.com

Other

Costly

Execution 704ms

Transfer 287 KB

Unused 51%

Monthly Cost €8/mo

abs.twimg.com

Other

Costly

Execution 338ms

Transfer 346 KB

Unused 30%

Monthly Cost €4/mo

Unattributable

Other

Optional

Execution 87ms

Transfer 0 KB

Monthly Cost €1/mo

These scripts may cost more than they're worth

abs.twimg.com adds 704ms and costs ~€8/month
abs.twimg.com adds 338ms and costs ~€4/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

abs.twimg.com takes 704ms 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

51% of abs.twimg.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

abs.twimg.com takes 338ms 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

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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