Skip to content
https://pictures.loowis.co.uk

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
4
REVIEW
4
PASS
15
INFO
3

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

Mobile Desktop
71
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.
100
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.

2.47 s

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

10.75 s

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.

3.56 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.

10.75 s

Page Load Progression

376 ms
752 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Checks
26
15 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
24.5 MB transferred, 28 requests
FIX
24.5 MB transferred, 28 requests
Critical::
Page weighs 24.8 MB (24.5 MB transferred)
Warning::
Images are 24.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 24.2 MB
Info::
28 HTTP requests
Info::
Estimated 5.1 g CO2 per page load
24.5 MB / 2.4 MB budget
24.5 MB transferred
28 requests
5.1 g CO2 per page load
Images 24.2 MiB 99%
JavaScript 141.6 KiB 1%
Fonts 91.5 KiB 0%
CSS 12.0 KiB 0%
HTML 4.8 KiB 0%
Other 1.1 KiB 0%
Other 472 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
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (24.2 MiB of 24.5 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
Page Weight Inventory
Action
28 resources · 24.5 MB · 48 KB savings available
FIX
28 resources · 24.5 MB · 48 KB savings available
Warning::
Page weight 24.5 MB exceeds 1 MB target by 23.5 MB
Got: 24.5 MB Expected: ≤ 1 MB
Warning::
12 third-party resources (99% of weight)
Info::
11 resources over 200KB
28 resources · 24.5 MiB · 12 third-party 23.5 MiB over 1MB target
Image 99% · 24.2 MiB
JavaScript 1% · 141.6 KiB
Font 0% · 91.5 KiB
CSS 0% · 12.0 KiB
Document 0% · 4.8 KiB
Other 0% · 472 B

~48.0 KiB of savings available

Remove unused JavaScript: 48.0 KiB
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.

B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 24.2 MB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
816ms total JS execution
REVIEW
816ms total JS execution
Warning::
Unattributable: 461ms CPU time
Info::
https://pictures.loowis.co.uk/: 178ms CPU time
Info::
https://pictures.loowis.co.uk/assets/main-OiV9TYi3...: 177ms CPU time
Warning::
Third-party scripts: 461ms (56% of total)

Main Thread Breakdown

Other 63% Script Evaluation 21% Style & Layout 10% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable461ms14ms0ms3rd
https://pictures.loowis.co.uk/178ms5ms4ms1st
https://pictures.loowis.co.uk/assets/main-OiV9TYi3.js177ms137ms2ms1st
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
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.
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
3 fonts (92 KB)
PASS
3 fonts (92 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

92 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.5 s LCP 10.7 shttps://pictures.loowis.co.uk/assets/JosefinSans-Regular-RCRYFJDO-B30Hk5dU.ttfJosefinSans-Regular-RCR... https://pictures.loowis.co.uk/assets/JosefinSans-Regular-RCRYFJDO-B30Hk5dU.ttf — 30.6 KiB — 136 ms — font-display: swaphttps://pictures.loowis.co.uk/fonts/josefin/JosefinSans-Bold.ttfJosefinSans-Bold.ttf https://pictures.loowis.co.uk/fonts/josefin/JosefinSans-Bold.ttf — 29.6 KiB — 126 ms — font-display: swaphttps://pictures.loowis.co.uk/assets/JosefinSans-BoldItalic-34LMGPR4-DWQIWmZs.ttfJosefinSans-BoldItalic-... https://pictures.loowis.co.uk/assets/JosefinSans-BoldItalic-34LMGPR4-DWQIWmZs.ttf — 31.4 KiB — 136 ms — font-display: swap
JosefinSans-Regular-RCR... ttf swap
Size 31 KB
Load time 136 ms
Start 358 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
JosefinSans-Bold.ttf ttf swap
Size 30 KB
Load time 126 ms
Start 358 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
JosefinSans-BoldItalic-... ttf swap
Size 31 KB
Load time 136 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~27 KB and ~54 ms

A+
JS Bundles
5 scripts, 48 KB unused
PASS
5 scripts, 48 KB unused
Warning::
https://pictures.loowis.co.uk/assets/main-OiV9TYi3...: 48 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 48 KB
48 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://pictures.loowis.co.uk/assets/main-OiV9TYi3.js108 KB48 KB (44%)✓1st
https://pictures.loowis.co.uk/assets/index-BNEWwMGt.js1 KB—✓1st
https://pictures.loowis.co.uk/assets/Layout-lIz149sC.js20 KB—✓1st
https://pictures.loowis.co.uk/assets/ImageModal-Bgdk64Ob.js2 KB—✓1st
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd

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

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
11 hints, 0 missing preconnects
PASS
11 hints, 0 missing preconnects
Info::
Page uses 11 resource hint(s)

Current Resource Hints

preconnect
—
preload
+1
11
dns-prefetch
—
prefetch
—

11 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+
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+
Server-Timing Observability
3 Server-Timing entries advertised
PASS
3 Server-Timing entries advertised
Info::
Server-Timing header advertises 3 timing entries
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
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
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
6 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
28 requests over 3860ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.5 s LCP 10.7 shttps://pictures.loowis.co.uk// https://pictures.loowis.co.uk/ — 200 — 4.8 KiB — 196 ms — h2https://images.loowis.co.uk/6bbba91a-5a19-4a45-8e75-70b2a40d64e2images.loowis.co.uk/6bbba91a-5a19-4... https://images.loowis.co.uk/6bbba91a-5a19-4a45-8e75-70b2a40d64e2 — 200 — 4.8 MiB — 2.8 s — h2https://images.loowis.co.uk/481ad75b-7f7e-46a9-8f68-32383b02f37bimages.loowis.co.uk/481ad75b-7f7e-4... https://images.loowis.co.uk/481ad75b-7f7e-46a9-8f68-32383b02f37b — 200 — 2.3 MiB — 2.8 s — h2https://pictures.loowis.co.uk/assets/main-OiV9TYi3.js/assets/main-OiV9TYi3.js https://pictures.loowis.co.uk/assets/main-OiV9TYi3.js — 200 — 108.3 KiB — 135 ms — h2https://pictures.loowis.co.uk/assets/index-BNEWwMGt.js/assets/index-BNEWwMGt.js https://pictures.loowis.co.uk/assets/index-BNEWwMGt.js — 200 — 879 B — 80 ms — h2https://pictures.loowis.co.uk/assets/Layout-lIz149sC.js/assets/Layout-lIz149sC.js https://pictures.loowis.co.uk/assets/Layout-lIz149sC.js — 200 — 20.1 KiB — 139 ms — h2https://pictures.loowis.co.uk/assets/ImageModal-Bgdk64Ob.js/assets/ImageModal-Bgdk64Ob.js https://pictures.loowis.co.uk/assets/ImageModal-Bgdk64Ob.js — 200 — 1.6 KiB — 69 ms — h2https://pictures.loowis.co.uk/assets/globals-CF7pGsgk.css/assets/globals-CF7pGsgk.css https://pictures.loowis.co.uk/assets/globals-CF7pGsgk.css — 200 — 982 B — 111 ms — h2https://pictures.loowis.co.uk/assets/index-DThzd8SH.css/assets/index-DThzd8SH.css https://pictures.loowis.co.uk/assets/index-DThzd8SH.css — 200 — 1.5 KiB — 64 ms — h2https://pictures.loowis.co.uk/assets/leaflet-CIGW-MKW.css/assets/leaflet-CIGW-MKW.css https://pictures.loowis.co.uk/assets/leaflet-CIGW-MKW.css — 200 — 6.8 KiB — 131 ms — h2https://pictures.loowis.co.uk/assets/main-CbBAMDfs.css/assets/main-CbBAMDfs.css https://pictures.loowis.co.uk/assets/main-CbBAMDfs.css — 200 — 677 B — 57 ms — h2https://pictures.loowis.co.uk/assets/index-_IEdDtTo.css/assets/index-_IEdDtTo.css https://pictures.loowis.co.uk/assets/index-_IEdDtTo.css — 200 — 825 B — 72 ms — h2https://pictures.loowis.co.uk/assets/ImageModal-Bjg7brg-.css/assets/ImageModal-Bjg7brg-.css https://pictures.loowis.co.uk/assets/ImageModal-Bjg7brg-.css — 200 — 1.2 KiB — 52 ms — h2https://images.loowis.co.uk/38f8fc5a-9cd6-4fd6-841a-48a7b0be971bimages.loowis.co.uk/38f8fc5a-9cd6-4... https://images.loowis.co.uk/38f8fc5a-9cd6-4fd6-841a-48a7b0be971b — 200 — 1.3 MiB — 1.5 s — h2https://images.loowis.co.uk/cfc1d58e-c42e-437a-9035-1d6ab1ebf271images.loowis.co.uk/cfc1d58e-c42e-4... https://images.loowis.co.uk/cfc1d58e-c42e-437a-9035-1d6ab1ebf271 — 200 — 5.3 MiB — 3.0 s — h2https://images.loowis.co.uk/7fbb3e73-b88d-4eab-99c4-fb415a14521cimages.loowis.co.uk/7fbb3e73-b88d-4... https://images.loowis.co.uk/7fbb3e73-b88d-4eab-99c4-fb415a14521c — 200 — 5.3 MiB — 2.9 s — h2https://images.loowis.co.uk/2d6f96db-6923-4e2f-9d00-3b5ab9fca450images.loowis.co.uk/2d6f96db-6923-4... https://images.loowis.co.uk/2d6f96db-6923-4e2f-9d00-3b5ab9fca450 — 200 — 1.1 MiB — 2.8 s — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 104 ms — h2https://images.loowis.co.uk/01293f70-d6a7-4cc9-a504-5ccb3c6dd5f4images.loowis.co.uk/01293f70-d6a7-4... https://images.loowis.co.uk/01293f70-d6a7-4cc9-a504-5ccb3c6dd5f4 — 200 — 812.4 KiB — 2.4 s — h2https://images.loowis.co.uk/6835d423-d0fa-4b88-87ef-6cf68cab7490images.loowis.co.uk/6835d423-d0fa-4... https://images.loowis.co.uk/6835d423-d0fa-4b88-87ef-6cf68cab7490 — 200 — 755.1 KiB — 1.3 s — h2https://images.loowis.co.uk/a827d3e5-ab97-4c4a-939a-592ae993e625images.loowis.co.uk/a827d3e5-ab97-4... https://images.loowis.co.uk/a827d3e5-ab97-4c4a-939a-592ae993e625 — 200 — 665.3 KiB — 3.5 s — h2https://images.loowis.co.uk/dcdad097-d42a-4487-b794-0d00efa46d82images.loowis.co.uk/dcdad097-d42a-4... https://images.loowis.co.uk/dcdad097-d42a-4487-b794-0d00efa46d82 — 200 — 580.3 KiB — 906 ms — h2https://images.loowis.co.uk/ddca0ca9-3aa7-4bf2-8361-2b13c9748602images.loowis.co.uk/ddca0ca9-3aa7-4... https://images.loowis.co.uk/ddca0ca9-3aa7-4bf2-8361-2b13c9748602 — 200 — 1.4 MiB — 2.1 s — h2https://pictures.loowis.co.uk/assets/JosefinSans-Regular-RCRYFJDO-B30Hk5dU.ttf/assets/JosefinSans-Regular-RCRYFJD... https://pictures.loowis.co.uk/assets/JosefinSans-Regular-RCRYFJDO-B30Hk5dU.ttf — 200 — 30.6 KiB — 136 ms — h3https://pictures.loowis.co.uk/fonts/josefin/JosefinSans-Bold.ttf/fonts/josefin/JosefinSans-Bold.ttf https://pictures.loowis.co.uk/fonts/josefin/JosefinSans-Bold.ttf — 200 — 29.6 KiB — 126 ms — h3https://pictures.loowis.co.uk/assets/JosefinSans-BoldItalic-34LMGPR4-DWQIWmZs.ttf/assets/JosefinSans-BoldItalic-34LM... https://pictures.loowis.co.uk/assets/JosefinSans-BoldItalic-34LMGPR4-DWQIWmZs.ttf — 200 — 31.4 KiB — 136 ms — h3https://pictures.loowis.co.uk/cdn-cgi/rum?/cdn-cgi/rum? https://pictures.loowis.co.uk/cdn-cgi/rum? — 204 — 472 B — 35 ms — h3https://pictures.loowis.co.uk/favicon/favicon.png/favicon/favicon.png https://pictures.loowis.co.uk/favicon/favicon.png — 200 — 1.1 KiB — 44 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
56% of JavaScript execution is third-party
First-party Third-party 461ms · 0KB · £5/mo
Unattributable
Other
Costly
Execution 461ms
Transfer 0 KB
Monthly Cost £5/mo

These scripts may cost more than they're worth

  • Unattributable adds 461ms and costs ~£5/month

56% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 461ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

Image Optimization
22 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

22

Total Size

0 KB

Oversized

10

22 missing alt text 21 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback