https://Mattsairporttransfers.co.uk
Performance
· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
87
GRADE
B
FIX
3
REVIEW
7
PASS
13
INFO
1
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
84
83
96
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.58 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.81 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
43 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.024
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.81 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.
6.41 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
2413 PASS 7 REVIEW 3 FIX
DThird-Party ImpactAction73% third-party, 0 ms blockingFIX
Third-Party Impact
Action73% third-party, 0 ms blocking
73% third-party, 0 ms blocking
Warning::
Third-party code accounts for 73% of page weight (1.2 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
27%
73%
First-party Third-party
DPage Weight InventoryAction37 resources · 1.6 MB · 72 KB savings availableFIX
Page Weight Inventory
Action37 resources · 1.6 MB · 72 KB savings available
37 resources · 1.6 MB · 72 KB savings available
Warning::
Page weight 1.6 MB exceeds 1 MB target by 614 KB
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~72 KB of savings available
Warning::
15 third-party resources (73% of weight)
37 resources · 1.6 MiB · 15 third-party 613.5 KiB over 1MB target
Font 45% · 740.3 KiB
Image 27% · 447.7 KiB
JavaScript 16% · 260.9 KiB
Document 10% · 158.6 KiB
CSS 2% · 29.3 KiB
Other 0% · 711 B
~72.5 KiB of savings available
Remove unused JavaScript: 72.5 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 37 resources | 1.6 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
HTTP Caching
Actionno-store (uncacheable)
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control
private, no-cache, no-store, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
CPage Weight BudgetAction1.6 MB transferred, 37 requestsREVIEW
Page Weight Budget
Action1.6 MB transferred, 37 requests
1.6 MB transferred, 37 requests
Info::
Page weighs 4.1 MB (1.6 MB transferred)
Info::
Fonts are 740 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 740 KB
Info::
37 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB transferred
37 requests
0.34 g CO2 per page load
Fonts 740.3 KiB 45%
Images 447.7 KiB 27%
JavaScript 259.9 KiB 16%
HTML 158.6 KiB 10%
CSS 29.3 KiB 2%
Other 1.1 KiB 0%
Other 711 B 0%
0 2.4 MB 4.9 MB
Approaching limit
Subset fonts to include only used characters, or switch to system font stacks.
Why this matters
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
CJS Execution CostAction1860ms total JS executionREVIEW
JS Execution Cost
Action1860ms total JS execution
1860ms total JS execution
Warning::
https://mattsairporttransfers.co.uk/: 943ms CPU time
Warning::
Unattributable: 542ms CPU time
Info::
https://mattsairporttransfers.co.uk/_next/static/c...: 180ms CPU time
Info::
https://mattsairporttransfers.co.uk/_next/static/c...: 115ms CPU time
Info::
https://mattsairporttransfers.co.uk/_next/static/c...: 79ms CPU time
Main Thread Breakdown
Other 32% Style & Layout 28% Script Evaluation 21% Parse HTML & CSS 10% Script Parsing & Compilation 4% Rendering 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://mattsairporttransfers.co.uk/ | 943ms | 25ms | 6ms | 1st |
| Unattributable | 542ms | 8ms | 0ms | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/framework-2c79e2a64abdb08b.js | 180ms | 156ms | 14ms | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/pages/index-4a13b777d403dbef.js | 115ms | 114ms | 0ms | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/main-7998c38af135e423.js | 79ms | 71ms | 7ms | 1st |
BJS Bundles15 scripts, 72 KB unusedREVIEW
JS Bundles
15 scripts, 72 KB unused
15 scripts, 72 KB unused
Warning::
https://mattsairporttransfers.co.uk/_next/static/c...: 46 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://mattsairporttransfers.co.uk/_next/static/c...: 26 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 72 KB
72 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://mattsairporttransfers.co.uk/_next/static/chunks/615-a28485c2e6e4db2e.js | 112 KB | 46 KB (45%) | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/701-ed4ab836780e8e70.js | 40 KB | 26 KB (66%) | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/pages/_app-d5d938091ecd5244.js | 22 KB | — | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/webpack-59c5c889f52620d6.js | 1 KB | — | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/252f366e-84f2b16f845a93e1.js | 1 KB | — | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/0c428ae2-7a9e6eb2f5992c81.js | 2 KB | — | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/1bfc9850-47474312fed2ba24.js | 3 KB | — | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/95b64a6e-36a16ced23fc6065.js | 1 KB | — | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/main-7998c38af135e423.js | 31 KB | — | ✓ | 1st |
| https://mattsairporttransfers.co.uk/_next/static/chunks/framework-2c79e2a64abdb08b.js | 45 KB | — | ✓ | 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
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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
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.
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+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 Optimization3 images, 0 KB saveablePASS
Image Optimization
3 images, 0 KB saveable
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 448 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+Font Loading11 fonts (740 KB)PASS
Font Loading
11 fonts (740 KB)
11 fonts (740 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
11
740 KB total
Render-blocking
0
of 11
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
font unknown swap
Size 75 KB
Load time 174 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 49 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDz8Z1x... woff2 swap
Size 8 KB
Load time 66 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 75 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
UcCo3FwrK3iLTcviYwYZ8UA... woff2 swap
Size 71 KB
Load time 161 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 83 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
font unknown swap
Size 166 KB
Load time 160 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pxiByp8kv8JHgFVrLDD4Z1x... woff2 swap
Size 8 KB
Load time 82 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
font unknown swap
Size 157 KB
Load time 156 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
font woff swap
Size 166 KB
Load time 159 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
font unknown swap
Size 67 KB
Load time 93 ms
Start 2.0 s
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)
Fixing the unchecked items could save ~433 KB and ~866 ms
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+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 uses no-store -- correct for sensitive/dynamic contentPASS
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-cache, no-store, max-age=0, must-revalidate
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::
`ETag` present -- conditional GET supported
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
Network Waterfall37 requests over 2525msINFO
Network Waterfall
37 requests over 2525ms
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.