Performance

· 22 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

100

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.

278 ms

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

596 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.

0.000

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

291 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.

596 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

12 PASS 4 REVIEW 3 FIX

Page Weight Budget

Action

2.3 MB transferred, 26 requests

FIX

2.3 MB transferred, 26 requests

Page weighs 2.4 MB (2.3 MB transferred)

Images are 2.2 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 2.2 MB

26 HTTP requests

Estimated 0.47 g CO2 per page load

2.3 MB transferred

26 requests

0.47 g CO2 per page load

Images 2.2 MiB 98%

HTML 12.4 KiB 1%

JavaScript 11.9 KiB 1%

CSS 7.6 KiB 0%

Other 2.9 KiB 0%

0 2.4 MB 4.9 MB

Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Third-Party Impact

Action

99% third-party, 0 ms blocking

FIX

99% third-party, 0 ms blocking

Third-party code accounts for 99% of page weight (2.2 MiB of 2.3 MiB)

Third-party blocking time is low (0 ms)

99%

First-party Third-party

Page Weight Inventory

Action

26 resources · 2.3 MB · 0 KB savings available

FIX

26 resources · 2.3 MB · 0 KB savings available

Page weight 2.3 MB exceeds 1 MB target by 1.3 MB

Got: 2.3 MB Expected: ≤ 1 MB

16 third-party resources (99% of weight)

1 resources over 200KB

26 resources · 2.3 MiB · 16 third-party 1.3 MiB over 1MB target

Image 99% · 2.2 MiB

Document 1% · 12.4 KiB

JavaScript 1% · 11.9 KiB

CSS 0% · 7.6 KiB

Other 0% · 814 B

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

26 resources			2.3 MiB

Image Optimization

12 images, 0 KB saveable

REVIEW

12 images, 0 KB saveable

All images are well-optimized

12 images 2.2 MB

0 oversized -0 KB

11 legacy format

0 missing dimensions CLS risk

Document Compression

Document response uses gzip; brotli would be ~20% smaller

REVIEW

Document response uses gzip; brotli would be ~20% smaller

Main HTML response uses gzip (brotli would be ~20% smaller)

All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.

Server-Timing Observability

No Server-Timing header found

REVIEW

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.

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 properly compressed.

A+

JS Execution Cost

87ms total JS execution

PASS

87ms total JS execution

https://towardsliberty.com/: 87ms CPU time

Main Thread Breakdown

Other 48% Style & Layout 34% Rendering 9% Script Evaluation 5% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://towardsliberty.com/	87ms	4ms	0ms	1st

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

4 scripts, 0 KB unused

PASS

4 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://towardsliberty.com/_astro/ZapModal.astro_astro_type_script_index_0_lang.B1aIAS2o.js	2 KB	—	✓	1st
https://towardsliberty.com/_astro/Base.astro_astro_type_script_index_0_lang.B86LJwd1.js	0 KB	—	✓	1st
https://towardsliberty.com/_astro/Base.astro_astro_type_script_index_1_lang.A5eoScdu.js	0 KB	—	✓	1st
https://towardsliberty.com/_astro/client.ax_QIWSw.js	10 KB	—	✓	1st

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+

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=300 (≤ 5min) is appropriate

PASS

Main HTML max-age=300 (≤ 5min) is appropriate

Got: public, max-age=300

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: Accept, Accept-Encoding

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).

Both `ETag` and `Last-Modified` present -- efficient revalidation supported

The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).

A+

HTTP Caching

max-age=300 (5 minutes)

PASS

max-age=300 (5 minutes)

Cache-Control header is set

Got: public, max-age=300

Effective TTL: 5 minutes (max-age=300)

ETag present — enables conditional (304) responses

Last-Modified header present

Cache-Control

public, max-age=300

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	300	Cache for 5 minutes

Effective TTL: 300 seconds

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

26 requests over 669ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

26 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

Oversized

26 missing dimensions 23 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.