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Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
2
REVIEW
6
PASS
15
INFO
2

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

Mobile Desktop
86
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
54
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.

2.36 s

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

3.71 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

122 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.

2.36 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.

3.71 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 s
Checks
25
15 PASS 6 REVIEW 2 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 17 requests
FIX
2.9 MB transferred, 17 requests
Warning::
Page weighs 3.6 MB (2.9 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 MB
Info::
17 HTTP requests
Info::
Estimated 0.60 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
17 requests
0.60 g CO2 per page load
Images 2.7 MiB 92%
JavaScript 131.2 KiB 4%
Fonts 74.0 KiB 3%
CSS 19.1 KiB 1%
HTML 1.4 KiB 0%
Other 532 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

D
JS Execution Cost
Action
2323ms total JS execution
FIX
2323ms total JS execution
Warning::
https://develop-corporate-site.quiet-sunset-55b2.w...: 1543ms CPU time
Warning::
https://develop-corporate-site.quiet-sunset-55b2.w...: 438ms CPU time
Warning::
Unattributable: 342ms CPU time

Main Thread Breakdown

Other 47% Style & Layout 29% Rendering 13% Script Evaluation 11%
ScriptTotalScriptingParse/CompileParty
https://develop-corporate-site.quiet-sunset-55b2.workers.dev/1543ms6ms1ms1st
https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/index-BAvvfShy.js438ms217ms2ms1st
Unattributable342ms37ms0ms1st
B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://develop-corporate-site.quiet-sunset-55b2.w... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 2.7 MB
0 oversized -0 KB
2 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

B
JS Bundles
1 scripts, 56 KB unused
REVIEW
1 scripts, 56 KB unused
Warning::
https://develop-corporate-site.quiet-sunset-55b2.w...: 56 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 56 KB
56 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/index-BAvvfShy.js131 KB56 KB (43%)✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
Server-Timing Observability
No Server-Timing header found
REVIEW
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.
C
Page Weight Inventory
Action
17 resources · 2.9 MB · 56 KB savings available
REVIEW
17 resources · 2.9 MB · 56 KB savings available
Warning::
Page weight 2.9 MB exceeds 1 MB target by 1.9 MB
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~56 KB of savings available
Info::
4 third-party resources (3% of weight)
Info::
5 resources over 200KB
17 resources · 2.9 MiB · 4 third-party 1.9 MiB over 1MB target
Image 92% · 2.7 MiB
JavaScript 4% · 131.2 KiB
Font 3% · 74.0 KiB
CSS 1% · 19.1 KiB
Document 0% · 1.4 KiB

~55.9 KiB of savings available

Remove unused JavaScript: 55.9 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
3% third-party, 0 ms blocking
PASS
3% third-party, 0 ms blocking
Info::
Third-party code accounts for 3% of page weight (76.1 KiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
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+
Font Loading
2 fonts (74 KB)
PASS
2 fonts (74 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

74 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 2.4 s LCP 3.7 shttps://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2LDIoaomQNQcsA88c7O9yZ4K... https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2 — 26.7 KiB — 30 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 42 ms — font-display: swap
LDIoaomQNQcsA88c7O9yZ4K... woff2 swap
Size 27 KB
Load time 30 ms
Start 467 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 42 ms
Start 467 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+
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
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 Algorithm
Main response uses brotli
PASS
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 Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, must-revalidate
A
Server Response Intelligence
2 server-response signal(s) detected
PASS
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::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
JavaScript Blocking
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall
17 requests over 698ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.4 s LCP 3.7 shttps://develop-corporate-site.quiet-sunset-55b2.workers.dev// https://develop-corporate-site.quiet-sunset-55b2.workers.dev/ — 200 — 1.4 KiB — 217 ms — h2https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Inter:wght@400;500;600;700&family=Caveat:wght@500;600;700&display=swapfonts.googleapis.com/css2?family=Pl... https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Inter:wght@400;500;600;700&family=Caveat:wght@500;600;700&display=swap — 200 — 1.5 KiB — 103 ms — h2https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/index-BAvvfShy.js/assets/index-BAvvfShy.js https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/index-BAvvfShy.js — 200 — 131.2 KiB — 95 ms — h2https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/index-oGcq4DrJ.css/assets/index-oGcq4DrJ.css https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/index-oGcq4DrJ.css — 200 — 16.9 KiB — 62 ms — h2https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&display=swapfonts.googleapis.com/css2?family=Fr... https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&display=swap — 200 — 642 B — 38 ms — h2https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/Logo%20O2-BsqWkVek.svg/assets/Logo%20O2-BsqWkVek.svg https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/Logo%20O2-BsqWkVek.svg — 200 — 33.7 KiB — 112 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/hero-CfUJRTCv.avif/assets/hero-CfUJRTCv.avif https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/hero-CfUJRTCv.avif — 200 — 95.5 KiB — 111 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/Icon.svg/Icon.svg https://develop-corporate-site.quiet-sunset-55b2.workers.dev/Icon.svg — 200 — 53.1 KiB — 236 ms — h3https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2fonts.gstatic.com/s/plusjakartasans... https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2 — 200 — 26.7 KiB — 30 ms — h3https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2fonts.gstatic.com/s/inter/v20/UcC73... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 200 — 47.3 KiB — 42 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about1-BqEMGjpT.avif/assets/about1-BqEMGjpT.avif https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about1-BqEMGjpT.avif — 200 — 214.2 KiB — 170 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about2-B6JOYGIv.avif/assets/about2-B6JOYGIv.avif https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about2-B6JOYGIv.avif — 200 — 222.5 KiB — 167 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about3-DR1brHAw.avif/assets/about3-DR1brHAw.avif https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about3-DR1brHAw.avif — 200 — 259.0 KiB — 158 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about4-CGir62MO.avif/assets/about4-CGir62MO.avif https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about4-CGir62MO.avif — 200 — 176.5 KiB — 161 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about5-doEdEExF.avif/assets/about5-doEdEExF.avif https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/about5-doEdEExF.avif — 200 — 215.6 KiB — 166 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/tech1-BDswpTUj.avif/assets/tech1-BDswpTUj.avif https://develop-corporate-site.quiet-sunset-55b2.workers.dev/assets/tech1-BDswpTUj.avif — 200 — 1.4 MiB — 220 ms — h3https://develop-corporate-site.quiet-sunset-55b2.workers.dev/Icon.svg/Icon.svg https://develop-corporate-site.quiet-sunset-55b2.workers.dev/Icon.svg — 200 — 532 B — 201 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
18 images, 233 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

18

Total Size

233 KB

18 missing dimensions 2 missing lazy loading
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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