https://though-threatened-trains-station.trycloudflare.com
Performance
· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
84
GRADE
B
FIX
3
REVIEW
5
PASS
11
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
73
97
96
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
938 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.02 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.
0.126
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.33 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.
4.04 s
Page Load Progression
445 ms 889 ms
1.3 s
1.8 s 2.2 s
2.7 s
3.1 s
3.6 sChecks
2211 PASS 5 REVIEW 3 FIX
FPage Weight BudgetAction4.0 MB transferred, 38 requestsFIX
Page Weight Budget
Action4.0 MB transferred, 38 requests
4.0 MB transferred, 38 requests
Critical::
Page weighs 4.2 MB (4.0 MB transferred)
Warning::
Images are 3.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.7 MB
Info::
38 HTTP requests
Info::
Estimated 0.83 g CO2 per page load
4.0 MB transferred
38 requests
0.83 g CO2 per page load
Images 3.7 MiB 93%
Fonts 183.8 KiB 5%
HTML 40.6 KiB 1%
Other 29.6 KiB 1%
CSS 20.1 KiB 0%
JavaScript 8.0 KiB 0%
Other 3.3 KiB 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
DThird-Party ImpactAction98% third-party, 0 ms blockingFIX
Third-Party Impact
Action98% third-party, 0 ms blocking
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (3.9 MiB of 4.0 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
DPage Weight InventoryAction38 resources · 4.0 MB · 0 KB savings availableFIX
Page Weight Inventory
Action38 resources · 4.0 MB · 0 KB savings available
38 resources · 4.0 MB · 0 KB savings available
Warning::
Page weight 4.0 MB exceeds 1 MB target by 3.0 MB
Got: 4.0 MB Expected: ≤ 1 MB
Warning::
33 third-party resources (98% of weight)
38 resources · 4.0 MiB · 33 third-party 3.0 MiB over 1MB target
Image 94% · 3.7 MiB
Font 5% · 183.8 KiB
Document 1% · 40.6 KiB
CSS 0% · 20.1 KiB
JavaScript 0% · 8.0 KiB
Other 0% · 3.3 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 38 resources | 4.0 MiB | ||||||
BImage Optimization27 images, 0 KB saveableREVIEW
Image Optimization
27 images, 0 KB saveable
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 3.7 MB
0 oversized -0 KB
26 legacy format
0 missing dimensions CLS risk
BJS Execution Cost756ms total JS executionREVIEW
JS Execution Cost
756ms total JS execution
756ms total JS execution
Warning::
https://though-threatened-trains-station.trycloudf...: 634ms CPU time
Info::
Unattributable: 122ms CPU time
Main Thread Breakdown
Other 61% Style & Layout 20% Rendering 14%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://though-threatened-trains-station.trycloudflare.com/ | 634ms | 12ms | 1ms | 1st |
| Unattributable | 122ms | 2ms | 0ms | 1st |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
HTTP/3 not advertised
Info::
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.
BCompression AlgorithmMain response uses gzip; brotli would be ~20% smallerREVIEW
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
Main response uses gzip; brotli would be ~20% smaller
Info::
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.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
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 CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font Loading3 fonts (184 KB)PASS
Font Loading
3 fonts (184 KB)
3 fonts (184 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
184 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
V8mDoQDjQSkFtoMM3T6r8E7... woff2 swap
Size 22 KB
Load time 53 ms
Start 851 ms
Risk FOUT — text flashes from fallback to web font
JTUSjIg69CK48gW7PXoo9Wl... woff2 swap
Size 8 KB
Load time 36 ms
Start 851 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 154 KB
Load time 77 ms
Start 854 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 Bundles2 scripts, 0 KB unusedPASS
JS Bundles
2 scripts, 0 KB unused
2 scripts, 0 KB unused
0 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdnjs.cloudflare.com/ajax/libs/dompurify/3.1.6/purify.min.js | 8 KB | — | ✓ | 3rd |
| https://though-threatened-trains-station.trycloudflare.com/env-config.js | 0 KB | — | ✓ | 1st |
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML max-age=10 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=10 (≤ 5min) is appropriate
Main HTML max-age=10 (≤ 5min) is appropriate
Info::
Main HTML max-age=10 (≤ 5min) is appropriate
Got: public, max-age=10, must-revalidate
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Info::
`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).
Info::
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 HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
AHTTP Cachingmax-age=10 (10 seconds)PASS
HTTP Caching
max-age=10 (10 seconds)
max-age=10 (10 seconds)
Info::
Cache-Control header is set
Got: public, max-age=10, must-revalidate
Info::
Effective TTL: 10 seconds (max-age=10)
Info::
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 Waterfall38 requests over 1209msINFO
Network Waterfall
38 requests over 1209ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-07-01 — 2026-07-28)
LCP (p75)
3127 ms
64% good
INP (p75)
203 ms
75% good
CLS (p75)
0.230
73% good
FCP (p75)
2058 ms
TTFB (p75)
1667 ms
Image Optimization34 images, 0 KB total, 0 KB wastedINFO
Image Optimization
34 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
34
Total Size
0 KB
Oversized
25
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.