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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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https://rewordsai.app

Performance

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

SCORE

91

GRADE

A

FIX

2

REVIEW

3

PASS

14

INFO

4

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

88

Performance

96

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.

1.45 s

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

1.68 s

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

2 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.

1.45 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.

2.28 s

Page Load Progression

688 ms

1.4 s

2.1 s

2.8 s

3.4 s

4.1 s

4.8 s

5.5 s

Checks

23

14 PASS 3 REVIEW 2 FIX

D

JS Execution Cost

Action

2377ms total JS execution

FIX

2377ms total JS execution

https://rewordsai.app/assets/framework-DJH1pfSr.js: 990ms CPU time

https://umami.bestvid.net/recorder.js: 589ms CPU time

https://rewordsai.app/assets/workspace-CfrZjWAS.js: 260ms CPU time

https://rewordsai.app/: 245ms CPU time

Unattributable: 146ms CPU time

Third-party scripts: 736ms (31% of total)

Main Thread Breakdown

Script Evaluation 61% Style & Layout 16% Other 15% Rendering 5%

Script	Total	Scripting	Parse/Compile	Party
https://rewordsai.app/assets/framework-DJH1pfSr.js	990ms	725ms	0ms	1st
https://umami.bestvid.net/recorder.js	589ms	551ms	4ms	3rd
https://rewordsai.app/assets/workspace-CfrZjWAS.js	260ms	35ms	0ms	1st
https://rewordsai.app/	245ms	12ms	7ms	1st
Unattributable	146ms	13ms	0ms	1st
https://scripts.clarity.ms/0.8.69/clarity.js	89ms	82ms	1ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-XZK9WYVKKD	58ms	49ms	9ms	3rd

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-store, must-revalidate

No ETag or Last-Modified header

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

Cache-Control

no-store, must-revalidate

Directive	Value	Meaning
no-store	—	Never cache this response
must-revalidate	—	Must recheck with server after expiry

B

Third-Party Impact

41% third-party, 0 ms blocking

REVIEW

41% third-party, 0 ms blocking

Third-party code accounts for 41% of page weight (359.3 KiB of 868.7 KiB)

Third-party blocking time is low (0 ms)

59%

41%

First-party Third-party

C

JS Bundles

Action

72 scripts, 181 KB unused

REVIEW

72 scripts, 181 KB unused

https://accounts.google.com/gsi/client: 72 KB unused (75%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=G-XZK9...: 71 KB unused (43%)

Consider code splitting or tree shaking to reduce unused code.

https://umami.bestvid.net/recorder.js: 38 KB unused (67%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 181 KB

181 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://accounts.google.com/gsi/client	97 KB	72 KB (75%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=G-XZK9WYVKKD	166 KB	71 KB (43%)	✓	3rd
https://umami.bestvid.net/recorder.js	58 KB	38 KB (67%)	✓	3rd
https://rewordsai.app/assets/global-error-CVl8f3Cz.js	1 KB	—	✓	1st
https://rewordsai.app/assets/framework-DJH1pfSr.js	60 KB	—	✓	1st
https://rewordsai.app/assets/rolldown-runtime-QTnfLwEv.js	1 KB	—	✓	1st
https://rewordsai.app/assets/url-utils-BQKFb685.js	1 KB	—	✓	1st
https://rewordsai.app/assets/error-BfKPhPMG.js	1 KB	—	✓	1st
https://rewordsai.app/assets/navigation-S2zqLEkv.js	2 KB	—	✓	1st
https://rewordsai.app/assets/react-DlbkFqaW.js	13 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

B

Server-Timing Observability

No Server-Timing header found

REVIEW

No Server-Timing header found

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.

A

Page Weight Budget

869 KB transferred, 112 requests

PASS

869 KB transferred, 112 requests

Page weighs 2.3 MB (869 KB transferred)

JavaScript is 593 KB — consider code splitting or lazy loading

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

Got: 593 KB

112 HTTP requests — consider bundling or reducing

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

Estimated 0.18 g CO2 per page load

869 KB transferred

112 requests

0.18 g CO2 per page load

JavaScript 592.7 KiB 68%

Images 168.3 KiB 19%

HTML 43.3 KiB 5%

CSS 31.0 KiB 4%

Other 24.6 KiB 3%

Other 6.8 KiB 1%

Other 1.1 KiB 0%

Other 905 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

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

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

7 images, 0 KB saveable

PASS

7 images, 0 KB saveable

All images are well-optimized

7 images 168 KB

0 oversized -0 KB

0 legacy format

0 missing dimensions CLS risk

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+

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/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

HTTP/3 (QUIC) is supported

First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.

A+

Compression Algorithm

Main response uses brotli

PASS

Main response uses brotli

Main HTML response uses brotli (Content-Encoding: br)

Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Main HTML Cache-Control

Main HTML uses no-store -- correct for sensitive/dynamic content

PASS

Main HTML uses no-store -- correct for sensitive/dynamic content

Main HTML uses no-store -- correct for sensitive/dynamic content

Got: no-store, must-revalidate

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: RSC, Accept, Next-Router-State-Tree, Next-Router-Prefetch, Next-Router-Segment-P...

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

No `ETag` or `Last-Modified` -- conditional GET not supported

Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.

A

Page Weight Inventory

112 resources · 869 KB · 181 KB savings available

PASS

112 resources · 869 KB · 181 KB savings available

Within 1MB page-weight target

Got: 869 KB

~181 KB of savings available

32 third-party resources (41% of weight)

112 resources · 868.7 KiB · 32 third-party Within 1MB page-weight target

JavaScript 68% · 592.7 KiB

Image 22% · 192.9 KiB

Document 5% · 43.3 KiB

CSS 4% · 31.0 KiB

Other 1% · 8.8 KiB

~181.0 KiB of savings available

Remove unused JavaScript: 181.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

112 resources			868.7 KiB

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

112 requests over 4939ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

31% of JavaScript execution is third-party

First-party Third-party 736ms · 249KB · €4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
umami.bestvid.net umami.bestvid.net	Other	589ms	58 KB	67%	€3/mo	Costly
Microsoft Clarity scripts.clarity.ms	Session Replay	89ms	25 KB	—	€0/mo	Optional
Google Tag Manager www.googletagmanager.com	Tag Manager	58ms	166 KB	43%	€0/mo	Optional

umami.bestvid.net

Other

Costly

Execution 589ms

Transfer 58 KB

Unused 67%

Monthly Cost €3/mo

Microsoft Clarity

Session Replay

Optional

Execution 89ms

Transfer 25 KB

Monthly Cost €0/mo

Google Tag Manager

Tag Manager

Optional

Execution 58ms

Transfer 166 KB

Unused 43%

Monthly Cost €0/mo

These scripts may cost more than they're worth

umami.bestvid.net adds 589ms and costs ~€3/month

umami.bestvid.net takes 589ms 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

67% of umami.bestvid.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

How third-party costs are calculated

Real-User Performance (CrUX)

Field metrics from the Chrome User Experience Report

INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-07-27 — 2026-08-23)

LCP (p75)

2708 ms

70% good

INP (p75)

223 ms

71% good

CLS (p75)

0.080

76% good

FCP (p75)

2542 ms

TTFB (p75)

0 ms

Image Optimization

12 images, 50 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

12

Total Size

50 KB

1 missing lazy loading

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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