Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.28 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.90 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
19 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.288
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.16 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.
10.92 s
Page Load Progression
CPage Weight BudgetAction1.6 MB transferred, 52 requestsREVIEW
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
CJS Execution CostAction1486ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 739ms | 8ms | 0ms | 1st |
| https://racing-hub.pages.dev/ | 537ms | 5ms | 1ms | 1st |
| https://racing-hub.pages.dev/js/modules/newsModule.js | 122ms | 95ms | 0ms | 1st |
| https://racing-hub.pages.dev/js/app.js | 89ms | 66ms | 0ms | 1st |
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
CPage Weight InventoryAction52 resources · 1.6 MB · 43 KB savings availableREVIEW
~43.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 52 resources | 1.6 MiB | ||||||
BHTTP Cachingno-cacheREVIEW
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
A+Third-Party Impact9% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization2 images, 0 KB saveablePASS
A+Font Loading4 fonts (227 KB)PASS
Web fonts
4
227 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~74 KB and ~148 ms
A+JS Bundles21 scripts, 43 KB unusedPASS
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 | 55 KB | 43 KB (80%) | ✓ | 3rd |
| https://racing-hub.pages.dev/js/modules/matchCenterModule.js | 1 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/store.js | 4 KB | — | ✓ | 1st |
| https://racing-hub.pages.dev/js/i18n.js | 22 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/app.js | 6 KB | — | ✓ | 1st |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
AResource Hints6 hints, 0 missing preconnectsPASS
Current Resource Hints
6 resource hints configured
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://cdn.jsdelivr.net, https://vpvydrbedxgzmfhweyko.supabase.co. Remove the redundant dns-prefetch entries.
Performance issues directly impact user engagement and conversion rates.
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://cdn.jsdelivr.net (preconnect+dns-prefetch), https://vpvydrbedxgzmfhweyko.supabase.co (preconnect+dns-prefetch).
Performance issues directly impact user engagement and conversion rates.
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+Document CompressionDocument response uses brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML uses no-cache -- safe revalidate-on-request policyPASS
AServer Response Intelligence2 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Asset CompressionNo text asset hosts to measureINFO
Network Waterfall52 requests over 934msINFO
Image Optimization37 images, 1137 KB total, 1135 KB wastedINFO
Image Optimization Audit
Total Images
37
Total Size
1137 KB
Oversized
1
Wasted
1135 KB