https://emanuelpina.pt
Performance
· 21 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
94
GRADE
A
FIX
2
REVIEW
3
PASS
14
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
100
88
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
439 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
639 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.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
439 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.
639 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
2114 PASS 3 REVIEW 2 FIX
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 (238.8 KiB of 243.1 KiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
DHTTP CachingActionNo cache headersFIX
HTTP Caching
ActionNo cache headers
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
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.
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
Main HTML Cache-Control
No Cache-Control header on main HTML response
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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+Page Weight Budget243 KB transferred, 8 requestsPASS
Page Weight Budget
243 KB transferred, 8 requests
243 KB transferred, 8 requests
Info::
Page weighs 258 KB (243 KB transferred)
Info::
8 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
243 KB transferred
8 requests
0.05 g CO2 per page load
Images 189.9 KiB 78%
Fonts 41.1 KiB 17%
CSS 6.4 KiB 3%
HTML 4.3 KiB 2%
Other 1.4 KiB 1%
0 2.4 MB 4.9 MB
Under budget
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 Optimization2 images, 0 KB saveablePASS
Image Optimization
2 images, 0 KB saveable
2 images, 0 KB saveable
Warning::
https://cdn.emanuelpina.pt/media/pages/notes/2025-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 190 KB
0 oversized -0 KB
0 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 CostNo JS execution dataPASS
JS Execution Cost
No JS execution data
No JS execution data
Info::
No significant JS execution detected
Main Thread Breakdown
Style & Layout 51% Other 38% Rendering 5% Script Evaluation 4%
A+Font Loading3 fonts (41 KB)PASS
Font Loading
3 fonts (41 KB)
3 fonts (41 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
41 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
AtkinsonHyperlegibleNex... woff2 swap
Size 13 KB
Load time 118 ms
Start 313 ms
Risk FOUT — text flashes from fallback to web font
AtkinsonHyperlegibleNex... woff2 swap
Size 13 KB
Load time 125 ms
Start 314 ms
Risk FOUT — text flashes from fallback to web font
AtkinsonHyperlegibleNex... woff2 swap
Size 15 KB
Load time 109 ms
Start 314 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 BundlesNo JavaScriptPASS
JS Bundles
No JavaScript
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
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+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+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::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
APage Weight Inventory8 resources · 243 KB · 0 KB savings availablePASS
Page Weight Inventory
8 resources · 243 KB · 0 KB savings available
8 resources · 243 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 243 KB
Warning::
7 third-party resources (98% of weight)
8 resources · 243.1 KiB · 7 third-party Within 1MB page-weight target
Image 79% · 191.3 KiB
Font 17% · 41.1 KiB
CSS 3% · 6.4 KiB
Document 2% · 4.3 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 8 resources | 243.1 KiB | ||||||
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: Hetzner Online GmbH
Network Waterfall8 requests over 480msINFO
Network Waterfall
8 requests over 480ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization2 images, 0 KB total, 0 KB wastedINFO
Image Optimization
2 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
2
Total Size
0 KB
2 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.