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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
2
REVIEW
1
PASS
10
INFO
1

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
99
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
70
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

778 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

778 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.

778 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.

778 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 s
Checks
14
10 PASS 1 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (84.7 KiB of 84.8 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
85 KB transferred, 14 requests
PASS
85 KB transferred, 14 requests
Info::
Page weighs 287 KB (85 KB transferred)
Info::
14 HTTP requests
Info::
Estimated 0.02 g CO2 per page load
85 KB / 2.4 MB budget
85 KB transferred
14 requests
0.02 g CO2 per page load
Fonts 72.3 KiB 85%
Other 4.0 KiB 5%
Images 2.6 KiB 3%
CSS 2.4 KiB 3%
JavaScript 2.3 KiB 3%
HTML 1.1 KiB 1%
0 2.4 MB 4.9 MB
Under budget
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Warning::
https://www.uc.pt/.bunny-shield/assets/challenge.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
1 images 3 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 Cost
No JS execution data
PASS
No JS execution data
Info::
No significant JS execution detected

Main Thread Breakdown

Other 66% Style & Layout 19% Script Evaluation 10%
A+
Font Loading
3 fonts (72 KB)
PASS
3 fonts (72 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

72 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 778 ms LCP 778 mshttps://fonts.bunny.net/inter/files/inter-latin-400-normal.woff2inter-latin-400-normal.... https://fonts.bunny.net/inter/files/inter-latin-400-normal.woff2 — 23.8 KiB — 8 ms — font-display: swaphttps://fonts.bunny.net/inter/files/inter-latin-700-normal.woff2inter-latin-700-normal.... https://fonts.bunny.net/inter/files/inter-latin-700-normal.woff2 — 24.5 KiB — 23 ms — font-display: swaphttps://fonts.bunny.net/inter/files/inter-latin-300-normal.woff2inter-latin-300-normal.... https://fonts.bunny.net/inter/files/inter-latin-300-normal.woff2 — 24.1 KiB — 34 ms — font-display: swap
inter-latin-400-normal.... woff2 swap
Size 24 KB
Load time 8 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-700-normal.... woff2 swap
Size 24 KB
Load time 23 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-300-normal.... woff2 swap
Size 24 KB
Load time 34 ms
Start 236 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 Bundles
5 scripts, 0 KB unused
PASS
5 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.uc.pt/.bunny-shield/assets/shield-challenge.js2 KB—✓3rd
https://www.uc.pt/.bunny-shield/assets/shield-worker.js0 KB—✓3rd
https://www.uc.pt/.bunny-shield/assets/shield-worker.js0 KB—✓3rd
https://www.uc.pt/.bunny-shield/assets/shield-worker.js0 KB—✓3rd
https://www.uc.pt/.bunny-shield/assets/shield-worker.js0 KB—✓3rd
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
14 resources · 85 KB · 0 KB savings available
PASS
14 resources · 85 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 85 KB
Warning::
13 third-party resources (100% of weight)
14 resources · 84.8 KiB · 13 third-party Within 1MB page-weight target
Font 85% · 72.3 KiB
Image 8% · 6.5 KiB
CSS 3% · 2.4 KiB
JavaScript 3% · 2.3 KiB
Document 1% · 1.1 KiB
Network Waterfall
14 requests over 325ms
INFO
0 ms 200 ms 400 ms 600 ms 800 ms FCP 778 ms LCP 778 mshttps://uc.pt// https://uc.pt/ — 301 — 75 B — 54 ms — h2https://www.uc.pt/www.uc.pt/ https://www.uc.pt/ — 200 — 1.1 KiB — 102 ms — h2https://fonts.bunny.net/css?family=Inter:300,400,500,700fonts.bunny.net/css?family=Inter:30... https://fonts.bunny.net/css?family=Inter:300,400,500,700 — 200 — 1.5 KiB — 53 ms — h2https://www.uc.pt/.bunny-shield/assets/challenge-styles.csswww.uc.pt/.bunny-shield/assets/chal... https://www.uc.pt/.bunny-shield/assets/challenge-styles.css — 200 — 1015 B — 35 ms — h2https://www.uc.pt/.bunny-shield/assets/shield-challenge.jswww.uc.pt/.bunny-shield/assets/shie... https://www.uc.pt/.bunny-shield/assets/shield-challenge.js — 200 — 2.1 KiB — 36 ms — h2https://www.uc.pt/.bunny-shield/assets/challenge.svgwww.uc.pt/.bunny-shield/assets/chal... https://www.uc.pt/.bunny-shield/assets/challenge.svg — 200 — 2.6 KiB — 36 ms — h2https://www.uc.pt/.bunny-shield/assets/shield-worker.jswww.uc.pt/.bunny-shield/assets/shie... https://www.uc.pt/.bunny-shield/assets/shield-worker.js — 200 — 215 B — 70 ms — h2https://www.uc.pt/.bunny-shield/assets/shield-worker.jswww.uc.pt/.bunny-shield/assets/shie... https://www.uc.pt/.bunny-shield/assets/shield-worker.js — 200 — 0 B — 76 ms — h2https://www.uc.pt/.bunny-shield/assets/shield-worker.jswww.uc.pt/.bunny-shield/assets/shie... https://www.uc.pt/.bunny-shield/assets/shield-worker.js — 200 — 0 B — 84 ms — h2https://www.uc.pt/.bunny-shield/assets/shield-worker.jswww.uc.pt/.bunny-shield/assets/shie... https://www.uc.pt/.bunny-shield/assets/shield-worker.js — 200 — 0 B — 86 ms — h2https://fonts.bunny.net/inter/files/inter-latin-400-normal.woff2fonts.bunny.net/inter/files/inter-l... https://fonts.bunny.net/inter/files/inter-latin-400-normal.woff2 — 200 — 23.8 KiB — 8 ms — h2https://fonts.bunny.net/inter/files/inter-latin-700-normal.woff2fonts.bunny.net/inter/files/inter-l... https://fonts.bunny.net/inter/files/inter-latin-700-normal.woff2 — 200 — 24.5 KiB — 23 ms — h2https://fonts.bunny.net/inter/files/inter-latin-300-normal.woff2fonts.bunny.net/inter/files/inter-l... https://fonts.bunny.net/inter/files/inter-latin-300-normal.woff2 — 200 — 24.1 KiB — 34 ms — h2https://www.uc.pt/favicon.icowww.uc.pt/favicon.ico https://www.uc.pt/favicon.ico — 200 — 3.9 KiB — 36 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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