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https://metoffice.gov.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

1.96 s

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

4.16 s

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

456 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.

4.20 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.

13.14 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
17
7 PASS 4 REVIEW 4 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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2808ms total JS execution
FIX
2808ms total JS execution
Warning::
https://www.metoffice.gov.uk/webfiles/176467346927...: 573ms CPU time
Warning::
Unattributable: 528ms CPU time
Warning::
https://www.metoffice.gov.uk/: 474ms CPU time
Warning::
https://players.brightcove.net/2310970326001/Yk2si...: 323ms CPU time
Warning::
https://www.metoffice.gov.uk/public/gdpr-consent/c...: 257ms CPU time
Warning::
Third-party scripts: 2808ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 25% Style & Layout 10% Script Parsing & Compilation 8% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.metoffice.gov.uk/webfiles/1764673469274/js/minified/homepage.min.js573ms512ms2ms3rd
Unattributable528ms9ms0ms3rd
https://www.metoffice.gov.uk/474ms11ms4ms3rd
https://players.brightcove.net/2310970326001/Yk2siaFBf_default/index.min.js323ms162ms136ms3rd
https://www.metoffice.gov.uk/public/gdpr-consent/cookieControl-config.js?1764673469274257ms130ms1ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.11.min.js191ms156ms34ms3rd
https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js180ms144ms2ms3rd
https://imasdk.googleapis.com/js/sdkloader/ima3_debug.js124ms84ms38ms3rd
https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.7.1/leaflet.js97ms26ms9ms3rd
https://pagead2.googlesyndication.com/omsdk/releases/live/omweb-v1.js62ms57ms3ms3rd
D
JS Bundles
Action
49 scripts, 363 KB unused
FIX
49 scripts, 363 KB unused
Warning::
https://players.brightcove.net/2310970326001/Yk2si...: 188 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://imasdk.googleapis.com/js/sdkloader/ima3_de...: 102 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 52 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.7...: 22 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 363 KB
363 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://players.brightcove.net/2310970326001/Yk2siaFBf_default/index.min.js326 KB188 KB (58%)✓3rd
https://imasdk.googleapis.com/js/sdkloader/ima3_debug.js160 KB102 KB (64%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.11.min.js123 KB52 KB (42%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.7.1/leaflet.js35 KB22 KB (62%)✓3rd
https://www.metoffice.gov.uk/webfiles/1764673469274/js/mapping/map/map.js2 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js6 KB—✓3rd
https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/geohash-location.js1 KB—✓3rd
https://www.metoffice.gov.uk/webfiles/1764673469274/js/minified/global.min.js9 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/iamdustan-smoothscroll/0.4.0/smoothscroll.min.js2 KB—✓3rd
https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/run-scripts-requiring-consent.js2 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

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

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

D
Page Weight Inventory
Action
111 resources · 1.9 MB · 363 KB savings available
FIX
111 resources · 1.9 MB · 363 KB savings available
Warning::
Page weight 960 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~363 KB of savings available
Warning::
110 third-party resources (100% of weight)
Info::
2 resources over 200KB
111 resources · 1.9 MiB · 110 third-party 959.5 KiB over 1MB target
JavaScript 39% · 765.1 KiB
Image 19% · 377.1 KiB
Document 16% · 315.7 KiB
Font 15% · 303.1 KiB
Other 10% · 192.7 KiB
CSS 2% · 29.8 KiB

~363.3 KiB of savings available

Remove unused JavaScript: 363.3 KiB
C
Page Weight Budget
Action
1.9 MB transferred, 111 requests
REVIEW
1.9 MB transferred, 111 requests
Info::
Page weighs 5.9 MB (1.9 MB transferred)
Warning::
JavaScript is 765 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 765 KB
Info::
Fonts are 303 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 303 KB
Warning::
111 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.41 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
111 requests
0.41 g CO2 per page load
JavaScript 765.1 KiB 39%
Images 374.8 KiB 19%
HTML 315.7 KiB 16%
Fonts 303.1 KiB 15%
Other 192.1 KiB 10%
CSS 29.8 KiB 2%
Other 2.4 KiB 0%
Other 430 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

B
Image Optimization
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://www.metoffice.gov.uk/webfiles/176467346927... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 375 KB
0 oversized -0 KB
30 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

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

Green Hosting

No green hosting detected

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

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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
5 fonts (303 KB)
PASS
5 fonts (303 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

303 KB total

Render-blocking

0

of 5

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 4.0 s FCP 2.0 s LCP 4.2 shttps://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Regular.woffFSEmericWeb-Regular.woff https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Regular.woff — 73.9 KiB — 35 ms — font-display: swaphttps://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Italic.woffFSEmericWeb-Italic.woff https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Italic.woff — 74.9 KiB — 41 ms — font-display: swaphttps://www.metoffice.gov.uk/static/fonts/FSEmericWeb-SemiBold.woffFSEmericWeb-SemiBold.woff https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-SemiBold.woff — 74.7 KiB — 46 ms — font-display: swaphttps://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Light.woffFSEmericWeb-Light.woff https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Light.woff — 74.4 KiB — 51 ms — font-display: swapdata:application/font-woff;charset=utf-8;base64,d09GRgABAAAAABTsAAsAAAAAIpAAAQAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64,d09GRgABAAAAABTsAAsAAAAAIpAAAQAAAAAAAAAAAAAAAAAAAAA… — 5.2 KiB — 35 ms — font-display: swap
FSEmericWeb-Regular.woff woff swap
Size 74 KB
Load time 35 ms
Start 95 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
FSEmericWeb-Italic.woff woff swap
Size 75 KB
Load time 41 ms
Start 96 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
FSEmericWeb-SemiBold.woff woff swap
Size 75 KB
Load time 46 ms
Start 96 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
FSEmericWeb-Light.woff woff swap
Size 74 KB
Load time 51 ms
Start 96 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
font-woff;charset=utf-8... woff swap
Size 5 KB
Load time 35 ms
Start 464 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 ~91 KB and ~182 ms

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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
1
preload
+3
13
dns-prefetch
—
prefetch
—

14 resource hints configured

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
Network Waterfall
111 requests over 1091ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.0 s LCP 4.2 shttps://metoffice.gov.uk// https://metoffice.gov.uk/ — 301 — 123 B — 64 ms — h2https://www.metoffice.gov.uk/www.metoffice.gov.uk/ https://www.metoffice.gov.uk/ — 200 — 15.3 KiB — 20 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/set-body-class.jswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/set-body-class.js — 200 — 600 B — 31 ms — h2https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Regular.woffwww.metoffice.gov.uk/static/fonts/F... https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Regular.woff — 200 — 73.9 KiB — 35 ms — h2https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Italic.woffwww.metoffice.gov.uk/static/fonts/F... https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Italic.woff — 200 — 74.9 KiB — 41 ms — h2https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-SemiBold.woffwww.metoffice.gov.uk/static/fonts/F... https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-SemiBold.woff — 200 — 74.7 KiB — 46 ms — h2https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Light.woffwww.metoffice.gov.uk/static/fonts/F... https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Light.woff — 200 — 74.4 KiB — 51 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/footer.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/footer.css — 200 — 3.3 KiB — 20 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/base.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/base.css — 200 — 11.7 KiB — 31 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/run-ab-test.jswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/run-ab-test.js — 200 — 1.2 KiB — 41 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/breadcrumb.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/breadcrumb.css — 200 — 653 B — 22 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/feedback-banner.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/feedback-banner.css — 200 — 547 B — 22 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/mapping/control/controls/titleControl/titleControl.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/mapping/control/controls/titleControl/titleControl.css — 200 — 714 B — 23 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/flood-warnings.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/flood-warnings.css — 200 — 830 B — 41 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/recent-locations-update.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/recent-locations-update.css — 200 — 1.7 KiB — 24 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/location-search-update.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/location-search-update.css — 200 — 1.6 KiB — 24 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/homepage.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/homepage.css — 200 — 1.9 KiB — 25 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/forecast-video.csswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/css/compiled/components/forecast-video.css — 200 — 1.8 KiB — 27 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/minified/homepage.min.jswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/minified/homepage.min.js — 200 — 3.7 KiB — 41 ms — h2https://www.metoffice.gov.uk/public/hero-images/2026/spring/640x491.jpgwww.metoffice.gov.uk/public/hero-im... https://www.metoffice.gov.uk/public/hero-images/2026/spring/640x491.jpg — 200 — 92.0 KiB — 31 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/util/iabtcf-es/stub.jswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/util/iabtcf-es/stub.js — 200 — 855 B — 41 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/images/logos/mo-green-white.svgwww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/images/logos/mo-green-white.svg — 200 — 1.2 KiB — 45 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/images/icons/common/chevron-right-grey.svgwww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/images/icons/common/chevron-right-grey.svg — 200 — 473 B — 15 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/components/location-search.jswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/components/location-search.js — 200 — 11.3 KiB — 46 ms — h2https://www.metoffice.gov.uk/static/js/external/latlon-geohash/latlon-geohash@2.0.0.jswww.metoffice.gov.uk/static/js/exte... https://www.metoffice.gov.uk/static/js/external/latlon-geohash/latlon-geohash@2.0.0.js — 200 — 1.3 KiB — 42 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/geohash-location.jswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/geohash-location.js — 200 — 828 B — 43 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/images/icons/common/chevron-right-green.svgwww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/images/icons/common/chevron-right-green.svg — 200 — 481 B — 19 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/images/icons/common/chevron-right-white.svgwww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/images/icons/common/chevron-right-white.svg — 200 — 477 B — 8 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/minified/global.min.jswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/minified/global.min.js — 200 — 9.2 KiB — 11 ms — h2https://cdnjs.cloudflare.com/ajax/libs/iamdustan-smoothscroll/0.4.0/smoothscroll.min.jscdnjs.cloudflare.com/ajax/libs/iamd... https://cdnjs.cloudflare.com/ajax/libs/iamdustan-smoothscroll/0.4.0/smoothscroll.min.js — 200 — 1.8 KiB — 86 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.0 s LCP 4.2 shttps://metoffice.gov.uk// https://metoffice.gov.uk/ — 301 — 123 B — 64 ms — h2https://www.metoffice.gov.uk/www.metoffice.gov.uk/ https://www.metoffice.gov.uk/ — 200 — 15.3 KiB — 20 ms — h2https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/set-body-class.jswww.metoffice.gov.uk/webfiles/17646... https://www.metoffice.gov.uk/webfiles/1764673469274/js/common/set-body-class.js — 200 — 600 B — 31 ms — h2https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Regular.woffwww.metoffice.gov.uk/static/fonts/F... https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Regular.woff — 200 — 73.9 KiB — 35 ms — h2https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Italic.woffwww.metoffice.gov.uk/static/fonts/F... https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-Italic.woff — 200 — 74.9 KiB — 41 ms — h2https://www.metoffice.gov.uk/static/fonts/FSEmericWeb-SemiBold.woffwww.metoffice.gov.uk/static/fonts/F... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 2808ms · 687KB · £29/mo
www.metoffice.gov.uk
Other
Costly
Execution 573ms
Transfer 4 KB
Monthly Cost £6/mo
Unattributable
Other
Costly
Execution 528ms
Transfer 0 KB
Monthly Cost £5/mo
www.metoffice.gov.uk
Other
Costly
Execution 474ms
Transfer 15 KB
Monthly Cost £5/mo
players.brightcove.net
Other
Costly
Execution 323ms
Transfer 326 KB
Unused 58%
Monthly Cost £3/mo
www.metoffice.gov.uk
Other
Costly
Execution 257ms
Transfer 2 KB
Monthly Cost £3/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 191ms
Transfer 123 KB
Unused 42%
Monthly Cost £2/mo
cdnjs
CDN
Optional
Execution 180ms
Transfer 6 KB
Monthly Cost £2/mo
imasdk.googleapis.com
Other
Optional
Execution 124ms
Transfer 160 KB
Unused 64%
Monthly Cost £1/mo
cdnjs
CDN
Optional
Execution 97ms
Transfer 35 KB
Unused 62%
Monthly Cost £1/mo
pagead2.googlesyndication.com
Other
Optional
Execution 62ms
Transfer 15 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.metoffice.gov.uk adds 573ms and costs ~£6/month
  • Unattributable adds 528ms and costs ~£5/month
  • www.metoffice.gov.uk adds 474ms and costs ~£5/month
  • players.brightcove.net adds 323ms and costs ~£3/month
  • www.metoffice.gov.uk adds 257ms and costs ~£3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.metoffice.gov.uk takes 573ms 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

Unattributable takes 528ms 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

www.metoffice.gov.uk takes 474ms 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

players.brightcove.net takes 323ms 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

58% of players.brightcove.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

www.metoffice.gov.uk takes 257ms 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

64% of imasdk.googleapis.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

62% of cdnjs's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

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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