Performance

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

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.

1.75 s

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

2.45 s

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

162 ms

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

0.001

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

1.75 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.

4.13 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

19 PASS 4 REVIEW

Third-Party Impact

43% third-party, 0 ms blocking

REVIEW

43% third-party, 0 ms blocking

Third-party code accounts for 43% of page weight (190.3 KiB of 446.2 KiB)

Third-party blocking time is low (0 ms)

57%

43%

First-party Third-party

JS Execution Cost

Action

1061ms total JS execution

REVIEW

1061ms total JS execution

https://www.googletagmanager.com/gtag/js?id=G-4R8T...: 274ms CPU time

https://markdownonline.app/_next/static/chunks/926...: 270ms CPU time

https://markdownonline.app/: 220ms CPU time

Unattributable: 189ms CPU time

https://markdownonline.app/_next/static/chunks/tur...: 109ms CPU time

Third-party scripts: 274ms (26% of total)

Main Thread Breakdown

Script Evaluation 58% Other 18% Style & Layout 10% Script Parsing & Compilation 9%

Script	Total	Scripting	Parse/Compile	Party
https://www.googletagmanager.com/gtag/js?id=G-4R8T9CBRZG	274ms	232ms	40ms	3rd
https://markdownonline.app/_next/static/chunks/92650cc2b74bcf81.js	270ms	231ms	15ms	1st
https://markdownonline.app/	220ms	41ms	12ms	1st
Unattributable	189ms	15ms	0ms	1st
https://markdownonline.app/_next/static/chunks/turbopack-e9512ac46f6b2315.js	109ms	108ms	1ms	1st

JS Bundles

14 scripts, 100 KB unused

REVIEW

14 scripts, 100 KB unused

https://www.googletagmanager.com/gtag/js?id=G-4R8T...: 75 KB unused (42%)

Consider code splitting or tree shaking to reduce unused code.

https://markdownonline.app/_next/static/chunks/926...: 25 KB unused (36%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 100 KB

100 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-4R8T9CBRZG	178 KB	75 KB (42%)	✓	3rd
https://markdownonline.app/_next/static/chunks/92650cc2b74bcf81.js	70 KB	25 KB (36%)	✓	1st
https://markdownonline.app/_next/static/chunks/turbopack-e9512ac46f6b2315.js	4 KB	—	✓	1st
https://markdownonline.app/_next/static/chunks/12daa96885968840.js	8 KB	—	✓	1st
https://static.cloudflareinsights.com/beacon.min.js/vce701823e78c4301a35b7e07294d87301792088814092	10 KB	—	✓	3rd
https://markdownonline.app/_next/static/chunks/d9c1ecc287c11b17.js	32 KB	—	✓	1st
https://markdownonline.app/_next/static/chunks/f63eeadce761d030.js	8 KB	—	✓	1st
https://markdownonline.app/_next/static/chunks/540a1fd86c02a577.js	2 KB	—	✓	1st
https://markdownonline.app/_next/static/chunks/ff1a16fafef87110.js	1 KB	—	✓	1st
https://markdownonline.app/_next/static/chunks/694836347d1e5ef3.js	8 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

HTTP Caching

public, max-age=0, must-revalidate

REVIEW

public, max-age=0, must-revalidate

Cache-Control header is set

Got: public, max-age=0, must-revalidate

No ETag or Last-Modified header

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

Cache-Control

public, max-age=0, must-revalidate

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

A+

Page Weight Budget

446 KB transferred, 32 requests

PASS

446 KB transferred, 32 requests

Page weighs 1.3 MB (446 KB transferred)

32 HTTP requests

Estimated 0.09 g CO2 per page load

446 KB transferred

32 requests

0.09 g CO2 per page load

JavaScript 397.6 KiB 89%

Other 23.9 KiB 5%

HTML 15.5 KiB 3%

CSS 5.6 KiB 1%

Images 1.9 KiB 0%

Other 1.3 KiB 0%

Other 504 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 properly compressed.

A+

Image Optimization

1 images, 0 KB saveable

PASS

1 images, 0 KB saveable

All images are well-optimized

1 images 2 KB

0 oversized -0 KB

1 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

2 hints, 0 missing preconnects

PASS

2 hints, 0 missing preconnects

Page uses 2 resource hint(s)

Current Resource Hints

preconnect

—

preload

dns-prefetch

—

prefetch

—

2 resource hints configured

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+

Document Compression

Document response uses brotli

PASS

Document 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 max-age=0 (≤ 5min) is appropriate

PASS

Main HTML max-age=0 (≤ 5min) is appropriate

Got: public, max-age=0, must-revalidate

A+

Server-Timing Observability

3 Server-Timing entries advertised

PASS

3 Server-Timing entries advertised

Server-Timing header advertises 3 timing entries

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

Compressed response missing `Vary` header

The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.

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.

Page Weight Inventory

32 resources · 446 KB · 100 KB savings available

PASS

32 resources · 446 KB · 100 KB savings available

Within 1MB page-weight target

Got: 446 KB

~100 KB of savings available

4 third-party resources (43% of weight)

32 resources · 446.2 KiB · 4 third-party Within 1MB page-weight target

JavaScript 89% · 397.6 KiB

Document 9% · 38.8 KiB

CSS 1% · 5.6 KiB

Image 1% · 3.2 KiB

Other 0% · 1.0 KiB

~99.7 KiB of savings available

Remove unused JavaScript: 99.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

32 resources			446.2 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

1 render-blocking <script src> tag(s) without async/defer

Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

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

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

No third-party or subdomain host served enough text assets to measure

Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.

Network Waterfall

32 requests over 538ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

26% of JavaScript execution is third-party

First-party Third-party 274ms · 178KB · €5/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	274ms	178 KB	42%	€5/mo	Costly

Google Tag Manager

Tag Manager

Costly

Execution 274ms

Transfer 178 KB

Unused 42%

Monthly Cost €5/mo

These scripts may cost more than they're worth

Google Tag Manager adds 274ms and costs ~€5/month

Google Tag Manager takes 274ms 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

Image Optimization

1 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

1 missing dimensions 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.