https://siffredirocco.com
Performance
· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
96
GRADE
A
FIX
0
REVIEW
2
PASS
17
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
99
87
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
419 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
855 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.
611 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.
859 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
2217 PASS 2 REVIEW
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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
APage Weight Budget789 KB transferred, 64 requestsPASS
Page Weight Budget
789 KB transferred, 64 requests
789 KB transferred, 64 requests
Info::
Page weighs 929 KB (789 KB transferred)
Info::
64 HTTP requests
Info::
Estimated 0.16 g CO2 per page load
789 KB transferred
64 requests
0.16 g CO2 per page load
Images 702.6 KiB 89%
Fonts 30.7 KiB 4%
JavaScript 30.3 KiB 4%
CSS 12.9 KiB 2%
HTML 8.4 KiB 1%
Other 3.5 KiB 0%
Other 486 B 0%
0 2.4 MB 4.9 MB
Under budget
A+Third-Party ImpactNo third-party resourcesPASS
Third-Party Impact
No third-party resources
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-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.
AImage Optimization55 images, 0 KB saveablePASS
Image Optimization
55 images, 0 KB saveable
55 images, 0 KB saveable
Warning::
https://siffredirocco.com/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
55 images 703 KB
0 oversized -0 KB
1 legacy format
1 missing dimensions CLS risk
Set explicit width and height to prevent CLS.
Why this matters
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
A+JS Execution Cost289ms total JS executionPASS
JS Execution Cost
289ms total JS execution
289ms total JS execution
Info::
https://siffredirocco.com/: 135ms CPU time
Info::
Unattributable: 100ms CPU time
Info::
https://siffredirocco.com/wp-content/themes/video-...: 53ms CPU time
Main Thread Breakdown
Other 50% Style & Layout 23% Rendering 12% Script Evaluation 8% Parse HTML & CSS 6%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://siffredirocco.com/ | 135ms | 7ms | 0ms | 1st |
| Unattributable | 100ms | 4ms | 0ms | 1st |
| https://siffredirocco.com/wp-content/themes/video-elements/series-nav.js?ver=1783755392 | 53ms | 1ms | 0ms | 1st |
A+Font Loading1 fonts (31 KB)PASS
Font Loading
1 fonts (31 KB)
1 fonts (31 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
1
31 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
nunito-sans-latin.woff2 woff2 swap
Size 31 KB
Load time 144 ms
Start 93 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)
A+JS Bundles4 scripts, 0 KB unusedPASS
JS Bundles
4 scripts, 0 KB unused
4 scripts, 0 KB unused
0 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://siffredirocco.com/wp-content/themes/video-elements/grid.js?ver=1783755392 | 2 KB | — | ✓ | 1st |
| https://siffredirocco.com/wp-content/themes/video-elements/series-nav.js?ver=1783755392 | 2 KB | — | ✓ | 1st |
| https://siffredirocco.com/wp-content/themes/video-elements/touch-preview.js?ver=1783755392 | 3 KB | — | ✓ | 1st |
| https://siffredirocco.com/piwik.php | 24 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+Compression AlgorithmMain response uses brotliPASS
Compression Algorithm
Main response uses brotli
Main 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=60 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=60 (≤ 5min) is appropriate
Main HTML max-age=60 (≤ 5min) is appropriate
Info::
Main HTML max-age=60 (≤ 5min) is appropriate
Got: max-age=60
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::
`Last-Modified` present -- timestamp-based conditional GET supported
Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.
A+Page Weight Inventory64 resources · 789 KB · 0 KB savings availablePASS
Page Weight Inventory
64 resources · 789 KB · 0 KB savings available
64 resources · 789 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 789 KB
64 resources · 788.9 KiB · 0 third-party Within 1MB page-weight target
Image 90% · 706.1 KiB
Font 4% · 30.7 KiB
JavaScript 4% · 30.3 KiB
CSS 2% · 12.9 KiB
Document 1% · 8.9 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 64 resources | 788.9 KiB | ||||||
A+HTTP Cachingmax-age=60 (1 minute)PASS
HTTP Caching
max-age=60 (1 minute)
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: max-age=60
Info::
Effective TTL: 1 minute (max-age=60)
Info::
Last-Modified header present
Cache-Control
max-age=60
| Directive | Value | Meaning |
|---|---|---|
| max-age | 60 | Cache for 1 minute |
Effective TTL: 60 seconds
Network Waterfall64 requests over 894msINFO
Network Waterfall
64 requests over 894ms
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 (2026-06-12 — 2026-07-09)
LCP (p75)
1206 ms
94% good
INP (p75)
105 ms
94% good
CLS (p75)
0.000
100% good
FCP (p75)
1152 ms
TTFB (p75)
684 ms
This origin passes Core Web Vitals assessment
Image Optimization74 images, 834 KB total, 147 KB wastedINFO
Image Optimization
74 images, 834 KB total, 147 KB wasted
Image Optimization Audit
Total Images
74
Total Size
834 KB
Oversized
7
Wasted
147 KB
26 missing dimensions 25 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.