https://though-threatened-trains-station.trycloudflare.com

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

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.

958 ms

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

3.17 s

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.

0.550

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

1.13 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.

3.20 s

Page Load Progression

427 ms

854 ms

1.3 s

1.7 s

2.1 s

2.6 s

3.0 s

3.4 s

Checks

11 PASS 5 REVIEW 3 FIX

Page Weight Budget

Action

3.8 MB transferred, 37 requests

FIX

3.8 MB transferred, 37 requests

Page weighs 4.0 MB (3.8 MB transferred)

Images are 3.5 MB — compress or use modern formats

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

Got: 3.5 MB

37 HTTP requests

Estimated 0.80 g CO2 per page load

3.8 MB transferred

37 requests

0.80 g CO2 per page load

Images 3.5 MiB 93%

Fonts 183.8 KiB 5%

HTML 41.6 KiB 1%

Other 29.6 KiB 1%

CSS 20.2 KiB 1%

Other 2.8 KiB 0%

JavaScript 177 B 0%

0 2.4 MB 4.9 MB

Over budget

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

98% third-party, 0 ms blocking

FIX

98% third-party, 0 ms blocking

Third-party code accounts for 98% of page weight (3.7 MiB of 3.8 MiB)

Third-party blocking time is low (0 ms)

98%

First-party Third-party

Page Weight Inventory

Action

37 resources · 3.8 MB · 0 KB savings available

FIX

37 resources · 3.8 MB · 0 KB savings available

Page weight 3.8 MB exceeds 1 MB target by 2.8 MB

Got: 3.8 MB Expected: ≤ 1 MB

32 third-party resources (98% of weight)

37 resources · 3.8 MiB · 32 third-party 2.8 MiB over 1MB target

Image 94% · 3.6 MiB

Font 5% · 183.8 KiB

Document 1% · 41.6 KiB

CSS 1% · 20.2 KiB

Other 0% · 2.8 KiB

JavaScript 0% · 177 B

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

37 resources			3.8 MiB

Image Optimization

27 images, 0 KB saveable

REVIEW

27 images, 0 KB saveable

All images are well-optimized

27 images 3.5 MB

0 oversized -0 KB

26 legacy format

0 missing dimensions CLS risk

JS Execution Cost

Action

1071ms total JS execution

REVIEW

1071ms total JS execution

https://though-threatened-trains-station.trycloudf...: 892ms CPU time

Unattributable: 179ms CPU time

Main Thread Breakdown

Other 69% Style & Layout 18% Rendering 8%

Script	Total	Scripting	Parse/Compile	Party
https://though-threatened-trains-station.trycloudflare.com/	892ms	25ms	2ms	1st
Unattributable	179ms	3ms	0ms	1st

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

HTTP/3 (QUIC) is not advertised

HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.

Compression Algorithm

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

REVIEW

Main 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.

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

3 fonts (184 KB)

PASS

3 fonts (184 KB)

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

Web fonts

184 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

JTUSjIg69CK48gW7PXoo9Wl... woff2 swap

Size 8 KB

Load time 11 ms

Start 345 ms

Risk FOUT — text flashes from fallback to web font

V8mDoQDjQSkFtoMM3T6r8E7... woff2 swap

Size 22 KB

Load time 17 ms

Start 345 ms

Risk FOUT — text flashes from fallback to web font

fa-solid-900.woff2 woff2 swap

Size 154 KB

Load time 60 ms

Start 345 ms

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

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)

Fixing the unchecked items could save ~77 KB and ~154 ms

A+

JS Bundles

1 scripts, 0 KB unused

PASS

1 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://though-threatened-trains-station.trycloudflare.com/env-config.js	0 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+

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=10 (≤ 5min) is appropriate

PASS

Main HTML max-age=10 (≤ 5min) is appropriate

Got: public, max-age=10, must-revalidate

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: 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).

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+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

HTTP Caching

max-age=10 (10 seconds)

PASS

max-age=10 (10 seconds)

Cache-Control header is set

Got: public, max-age=10, must-revalidate

Effective TTL: 10 seconds (max-age=10)

No ETag or Last-Modified header

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

Cache-Control

public, max-age=10, must-revalidate

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	10	Cache for 10 seconds
must-revalidate	—	Must recheck with server after expiry

Effective TTL: 10 seconds

Network Waterfall

37 requests over 988ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

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 (2026-06-29 — 2026-07-26)

LCP (p75)

3092 ms

65% good

INP (p75)

197 ms

75% good

CLS (p75)

0.230

73% good

FCP (p75)

2009 ms

TTFB (p75)

1606 ms

Image Optimization

34 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

Oversized

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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Performance

Page Load Progression

Font loading timeline

Optimization checklist

Green Hosting

Chrome User Experience (CrUX)

Image Optimization Audit