https://racing-hub.pages.dev
Performance
· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
92
GRADE
A
FIX
0
REVIEW
4
PASS
15
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
96
100
92
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
741 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
758 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.
0.106
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
741 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.
758 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 sChecks
2215 PASS 4 REVIEW
CPage Weight BudgetAction2.0 MB transferred, 63 requestsREVIEW
Page Weight Budget
Action2.0 MB transferred, 63 requests
2.0 MB transferred, 63 requests
Info::
Page weighs 3.9 MB (2.0 MB transferred)
Info::
63 HTTP requests
Info::
Estimated 0.41 g CO2 per page load
2.0 MB transferred
63 requests
0.41 g CO2 per page load
Other 1.6 MiB 82%
Fonts 172.3 KiB 9%
JavaScript 121.3 KiB 6%
CSS 48.1 KiB 2%
Other 6.9 KiB 0%
HTML 3.0 KiB 0%
Images 0 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit
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.
CPage Weight InventoryAction63 resources · 2.0 MB · 0 KB savings availableREVIEW
Page Weight Inventory
Action63 resources · 2.0 MB · 0 KB savings available
63 resources · 2.0 MB · 0 KB savings available
Warning::
Page weight 2.0 MB exceeds 1 MB target by 984 KB
Got: 2.0 MB Expected: ≤ 1 MB
Info::
31 third-party resources (13% of weight)
Info::
1 resources over 200KB
63 resources · 2.0 MiB · 31 third-party 983.9 KiB over 1MB target
Image 82% · 1.6 MiB
Font 9% · 172.3 KiB
JavaScript 6% · 121.3 KiB
CSS 2% · 48.1 KiB
Other 0% · 6.9 KiB
Document 0% · 3.0 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 63 resources | 2.0 MiB | ||||||
BHTTP Cachingpublic, max-age=0, must-revalidateREVIEW
HTTP Caching
public, max-age=0, must-revalidate
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
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+Third-Party Impact13% third-party, 0 ms blockingPASS
Third-Party Impact
13% third-party, 0 ms blocking
13% third-party, 0 ms blocking
Info::
Third-party code accounts for 13% of page weight (252.6 KiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
87%
First-party Third-party
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+Image Optimization1 images, 0 KB saveablePASS
Image Optimization
1 images, 0 KB saveable
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+JS Execution Cost209ms total JS executionPASS
JS Execution Cost
209ms total JS execution
209ms total JS execution
Info::
Unattributable: 117ms CPU time
Info::
https://racing-hub.pages.dev/: 92ms CPU time
Main Thread Breakdown
Other 52% Style & Layout 24% Script Evaluation 15% Rendering 5% Parse HTML & CSS 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 117ms | 2ms | 0ms | 1st |
| https://racing-hub.pages.dev/ | 92ms | 1ms | 0ms | 1st |
A+Font Loading2 fonts (172 KB)PASS
Font Loading
2 fonts (172 KB)
2 fonts (172 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
172 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
fa-solid-900.woff2 woff2 swap
Size 147 KB
Load time 64 ms
Start 180 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
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 31 ms
Start 642 ms
Risk FOUT — text flashes from fallback to web font
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 ~74 KB and ~148 ms
A+JS Bundles17 scripts, 0 KB unusedPASS
JS Bundles
17 scripts, 0 KB unused
17 scripts, 0 KB unused
0 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.jsdelivr.net/npm/@supabase/supabase-js@2.115.0/dist/umd/supabase.min.js | 54 KB | — | ✓ | 3rd |
| https://racing-hub.pages.dev/js/app.js | 4 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/store.js | 4 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/i18n.js | 12 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/modules/newsModule.js | 5 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/modules/statsModule.js | 9 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/modules/pronosticsModule.js | 4 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/modules/quizModule.js | 3 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/modules/gamificationModule.js | 5 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/modules/collectionModule.js | 1 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+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
HTTP/3 advertised via Alt-Svc
Info::
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 CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
Document response uses brotli
Info::
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 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=0 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, must-revalidate
AServer Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Warning::
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.
Info::
`ETag` present -- conditional GET supported
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
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
No text asset hosts to measure
Info::
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 Waterfall63 requests over 672msINFO
Network Waterfall
63 requests over 672ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization26 images, 0 KB total, 0 KB wastedINFO
Image Optimization
26 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
26
Total Size
0 KB
Oversized
1
26 missing dimensions 26 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.