https://siffredirocco.com
Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
96
GRADE
A
FIX
0
REVIEW
3
PASS
20
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.
955 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.15 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
39 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.
987 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.
2.17 s
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
2620 PASS 3 REVIEW
BJS Execution Cost760ms total JS executionREVIEW
JS Execution Cost
760ms total JS execution
760ms total JS execution
Warning::
https://siffredirocco.com/: 497ms CPU time
Warning::
Unattributable: 263ms CPU time
Main Thread Breakdown
Other 47% Style & Layout 22% Script Evaluation 11% Parse HTML & CSS 10% Rendering 9%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://siffredirocco.com/ | 497ms | 12ms | 1ms | 1st |
| Unattributable | 263ms | 27ms | 0ms | 1st |
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
A+Page Weight Budget548 KB transferred, 24 requestsPASS
Page Weight Budget
548 KB transferred, 24 requests
548 KB transferred, 24 requests
Info::
Page weighs 709 KB (548 KB transferred)
Info::
24 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
548 KB transferred
24 requests
0.11 g CO2 per page load
Images 462.6 KiB 84%
Fonts 30.6 KiB 6%
JavaScript 29.8 KiB 5%
CSS 12.7 KiB 2%
HTML 8.4 KiB 2%
Other 3.5 KiB 1%
Other 489 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 Optimization15 images, 0 KB saveablePASS
Image Optimization
15 images, 0 KB saveable
15 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.
15 images 463 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+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 70 ms
Start 116 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 | 1 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
AResource Hints3 hints, 0 missing preconnectsPASS
Resource Hints
3 hints, 0 missing preconnects
3 hints, 0 missing preconnects
Warning::
1 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://siffredirocco.com/wp-content/themes/video-elements/fonts/nunito-sans-latin.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Info::
Page uses 3 resource hint(s)
Current Resource Hints
preconnect 2
preload 1
dns-prefetch—
prefetch—
3 resource hints configured
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://siffredirocco.com/wp-content/themes/video-elements/fonts/nunito-sans-latin.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Why this matters
Performance issues directly impact user engagement and conversion rates.
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 Inventory24 resources · 548 KB · 0 KB savings availablePASS
Page Weight Inventory
24 resources · 548 KB · 0 KB savings available
24 resources · 548 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 548 KB
24 resources · 547.9 KiB · 0 third-party Within 1MB page-weight target
Image 85% · 466.0 KiB
Font 6% · 30.6 KiB
JavaScript 5% · 29.8 KiB
CSS 2% · 12.7 KiB
Document 2% · 8.8 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 24 resources | 547.9 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
JavaScript Blocking
No render-blocking JS or document.write usage detected
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
CSS Performance Depth
No CSS performance depth issues detected
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
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 Waterfall24 requests over 788msINFO
Network Waterfall
24 requests over 788ms
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.