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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
27
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

8.18 s

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

16.27 s

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

3.15 s

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.

8.47 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.

19.07 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
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 99 requests
FIX
2.3 MB transferred, 99 requests
Info::
Page weighs 6.8 MB (2.3 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
Fonts are 215 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 215 KB
Info::
99 HTTP requests
Info::
Estimated 0.49 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
99 requests
0.49 g CO2 per page load
JavaScript 1.3 MiB 55%
Images 583.7 KiB 24%
Fonts 215.3 KiB 9%
Other 140.1 KiB 6%
CSS 87.7 KiB 4%
Other 24.6 KiB 1%
HTML 21.8 KiB 1%
Other 6.2 KiB 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

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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6941ms total JS execution
FIX
6941ms total JS execution
Warning::
https://sgtm.rhs.org.uk/gtm.js?id=GTM-KLMZK7V&gtm_...: 989ms CPU time
Warning::
Unattributable: 828ms CPU time
Warning::
https://cdn.optimizely.com/js/22397541806.js: 796ms CPU time
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 616ms CPU time
Warning::
https://sgtm.rhs.org.uk/gtag/js?id=G-X9Q3NCQ40M&cx...: 593ms CPU time
Warning::
Third-party scripts: 6941ms (100% of total)

Main Thread Breakdown

Script Evaluation 67% Other 12% Script Parsing & Compilation 9% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://sgtm.rhs.org.uk/gtm.js?id=GTM-KLMZK7V&gtm_auth=kQdgmT7CzoPxddBc8XfCqg&gtm_preview=env-1&gtm_cookies_win=x989ms884ms74ms3rd
Unattributable828ms106ms0ms3rd
https://cdn.optimizely.com/js/22397541806.js796ms669ms83ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202504.1.0/otTCF.js616ms567ms9ms3rd
https://sgtm.rhs.org.uk/gtag/js?id=G-X9Q3NCQ40M&cx=c&gtm=4e64k0&sign=d928352167507012e7c731483f357fd33e8100f10c9a7b0cd52ffab8ec568965_20260422593ms442ms105ms3rd
https://c.amazon-adsystem.com/aax2/apstag.js409ms352ms47ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202504.1.0/otBannerSdk.js406ms241ms64ms3rd
https://static.srcspot.com/libs/isa.js397ms361ms17ms3rd
https://www.rhs.org.uk/371ms36ms7ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js348ms255ms80ms3rd

Showing top 10 of 19 scripts

F
JS Bundles
Action
40 scripts, 522 KB unused
FIX
40 scripts, 522 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 131 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sgtm.rhs.org.uk/gtag/js?id=G-X9Q3NCQ40M&cx...: 64 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 56 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sgtm.rhs.org.uk/gtm.js?id=GTM-KLMZK7V&gtm_...: 53 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rhs.org.uk/assets/csjs/thirdparty/yext...: 50 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 522 KB
522 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB131 KB (70%)✓3rd
https://sgtm.rhs.org.uk/gtag/js?id=G-X9Q3NCQ40M&cx=c&gtm=4e64k0&sign=d928352167507012e7c731483f357fd33e8100f10c9a7b0cd52ffab8ec568965_20260422165 KB64 KB (39%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202504.1.0/otBannerSdk.js118 KB56 KB (47%)✓3rd
https://sgtm.rhs.org.uk/gtm.js?id=GTM-KLMZK7V&gtm_auth=kQdgmT7CzoPxddBc8XfCqg&gtm_preview=env-1&gtm_cookies_win=x151 KB53 KB (35%)✓3rd
https://www.rhs.org.uk/assets/csjs/thirdparty/yext/answers.min.js?v=7304380 KB50 KB (63%)✓3rd
https://cdn.optimizely.com/js/22397541806.js141 KB39 KB (28%)✓3rd
https://c.amazon-adsystem.com/aax2/apstag.js91 KB36 KB (40%)✓3rd
https://static.srcspot.com/libs/isa.js51 KB25 KB (50%)✓3rd
https://cdn1.anonymised.io/light/auth.js?v=1.8.5428 KB23 KB (86%)✓3rd
https://tag.durationmedia.net/sites/11017/dm.js34 KB21 KB (63%)✓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

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

F
Page Weight Inventory
Action
99 resources · 2.3 MB · 522 KB savings available
FIX
99 resources · 2.3 MB · 522 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~522 KB of savings available
Warning::
98 third-party resources (100% of weight)
99 resources · 2.3 MiB · 98 third-party 1.3 MiB over 1MB target
JavaScript 60% · 1.4 MiB
Image 24% · 585.4 KiB
Font 9% · 215.3 KiB
CSS 4% · 92.1 KiB
Other 2% · 41.9 KiB
Document 1% · 21.8 KiB

~521.6 KiB of savings available

Remove unused JavaScript: 521.6 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
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Info::
All images are well-optimized
19 images 584 KB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
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
10 fonts (215 KB)
PASS
10 fonts (215 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

215 KB total

Render-blocking

0

of 10

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 12.0 s 14.0 s 16.0 s FCP 8.2 s LCP 16.3 shttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/gt-super-text-black.woff2gt-super-text-black.woff2 https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/gt-super-text-black.woff2 — 61.3 KiB — 54 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanproboo-webfont.woff2freigsanproboo-webfont.... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanproboo-webfont.woff2 — 26.6 KiB — 70 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/rhs-icons.woff2rhs-icons.woff2 https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/rhs-icons.woff2 — 20.5 KiB — 73 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-brands-400.woff2 — 3.1 KiB — 61 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-light-300.woff2fa-light-300.woff2 https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-light-300.woff2 — 7.1 KiB — 65 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-regular-400.woff2 — 8.0 KiB — 65 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-solid-900.woff2 — 8.7 KiB — 65 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanprosem-webfont.woff2freigsanprosem-webfont.... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanprosem-webfont.woff2 — 28.7 KiB — 32 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanprolig-webfont.woff2freigsanprolig-webfont.... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanprolig-webfont.woff2 — 25.0 KiB — 27 ms — font-display: swaphttps://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanproligita-webfont.woff2freigsanproligita-webfo... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanproligita-webfont.woff2 — 26.3 KiB — 34 ms — font-display: swap
gt-super-text-black.woff2 woff2 swap
Size 61 KB
Load time 54 ms
Start 269 ms
Risk FOUT — text flashes from fallback to web font
freigsanproboo-webfont.... woff2 swap
Size 27 KB
Load time 70 ms
Start 270 ms
Risk FOUT — text flashes from fallback to web font
rhs-icons.woff2 woff2 swap
Size 20 KB
Load time 73 ms
Start 270 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 3 KB
Load time 61 ms
Start 271 ms
Risk FOUT — text flashes from fallback to web font
fa-light-300.woff2 woff2 swap
Size 7 KB
Load time 65 ms
Start 271 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 8 KB
Load time 65 ms
Start 275 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 9 KB
Load time 65 ms
Start 275 ms
Risk FOUT — text flashes from fallback to web font
freigsanprosem-webfont.... woff2 swap
Size 29 KB
Load time 32 ms
Start 857 ms
Risk FOUT — text flashes from fallback to web font
freigsanprolig-webfont.... woff2 swap
Size 25 KB
Load time 27 ms
Start 857 ms
Risk FOUT — text flashes from fallback to web font
freigsanproligita-webfo... woff2 swap
Size 26 KB
Load time 34 ms
Start 857 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
7
dns-prefetch
—
prefetch
—

7 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
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
99 requests over 4817ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 8.2 s LCP 16.3 shttps://rhs.org.uk// https://rhs.org.uk/ — 301 — 194 B — 21 ms — h3https://www.rhs.org.uk/www.rhs.org.uk/ https://www.rhs.org.uk/ — 200 — 19.1 KiB — 274 ms — h3https://www.rhs.org.uk/cdn-cgi/speculationwww.rhs.org.uk/cdn-cgi/speculation https://www.rhs.org.uk/cdn-cgi/speculation — 200 — 306 B — 5 ms — h3https://static.srcspot.com/libs/isa.jsstatic.srcspot.com/libs/isa.js https://static.srcspot.com/libs/isa.js — 200 — 50.9 KiB — 354 ms — h2https://www.rhs.org.uk/wwwroot/js/bundles/adsConfig.min.js?v=73043www.rhs.org.uk/wwwroot/js/bundles/a... https://www.rhs.org.uk/wwwroot/js/bundles/adsConfig.min.js?v=73043 — 200 — 742 B — 35 ms — h3https://www.rhs.org.uk/wwwroot/js/bundles/apstagHandler.min.js?v=73043www.rhs.org.uk/wwwroot/js/bundles/a... https://www.rhs.org.uk/wwwroot/js/bundles/apstagHandler.min.js?v=73043 — 200 — 865 B — 39 ms — h3https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.jscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 48 ms — h2https://cdn.optimizely.com/js/22397541806.jscdn.optimizely.com/js/22397541806.j... https://cdn.optimizely.com/js/22397541806.js — 200 — 141.2 KiB — 127 ms — h2https://www.rhs.org.uk/wwwroot/js/bundles/head.min.js?v=73043www.rhs.org.uk/wwwroot/js/bundles/h... https://www.rhs.org.uk/wwwroot/js/bundles/head.min.js?v=73043 — 200 — 30.9 KiB — 55 ms — h3https://www.rhs.org.uk/wwwroot/js/bundles/main.min.js?v=73043www.rhs.org.uk/wwwroot/js/bundles/m... https://www.rhs.org.uk/wwwroot/js/bundles/main.min.js?v=73043 — 200 — 14.0 KiB — 57 ms — h3https://www.rhs.org.uk/wwwroot/js/bundles/search.min.js?v=73043www.rhs.org.uk/wwwroot/js/bundles/s... https://www.rhs.org.uk/wwwroot/js/bundles/search.min.js?v=73043 — 200 — 20.6 KiB — 40 ms — h3https://www.rhs.org.uk/wwwroot/css/bundles/styles.min.css?v=73043www.rhs.org.uk/wwwroot/css/bundles/... https://www.rhs.org.uk/wwwroot/css/bundles/styles.min.css?v=73043 — 200 — 83.3 KiB — 74 ms — h3https://www.rhs.org.uk/wwwroot/css/bundles/search.min.css?v=73043www.rhs.org.uk/wwwroot/css/bundles/... https://www.rhs.org.uk/wwwroot/css/bundles/search.min.css?v=73043 — 200 — 3.4 KiB — 33 ms — h3https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/gt-super-text-black.woff2www.rhs.org.uk/assets/styles/f2/web... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/gt-super-text-black.woff2 — 200 — 61.3 KiB — 54 ms — h3https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanproboo-webfont.woff2www.rhs.org.uk/assets/styles/f2/web... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/freigsanproboo-webfont.woff2 — 200 — 26.6 KiB — 70 ms — h3https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/rhs-icons.woff2www.rhs.org.uk/assets/styles/f2/web... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/rhs-icons.woff2 — 200 — 20.5 KiB — 73 ms — h3https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-brands-400.woff2www.rhs.org.uk/assets/styles/f2/web... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-brands-400.woff2 — 200 — 3.1 KiB — 61 ms — h3https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-light-300.woff2www.rhs.org.uk/assets/styles/f2/web... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-light-300.woff2 — 200 — 7.1 KiB — 65 ms — h3https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-regular-400.woff2www.rhs.org.uk/assets/styles/f2/web... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-regular-400.woff2 — 200 — 8.0 KiB — 65 ms — h3https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-solid-900.woff2www.rhs.org.uk/assets/styles/f2/web... https://www.rhs.org.uk/assets/styles/f2/web/assets/fonts/fa-solid-900.woff2 — 200 — 8.7 KiB — 65 ms — 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1.1 KiB — 25 ms — h3https://be.durationmedia.net/scriptloaded?siteId=11017be.durationmedia.net/scriptloaded?s... https://be.durationmedia.net/scriptloaded?siteId=11017 — 200 — 672 B — 1.1 s — http/1.1https://www.rhs.org.uk/favicon.icowww.rhs.org.uk/favicon.ico https://www.rhs.org.uk/favicon.ico — 200 — 0 B — 2 ms — h3
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 6941ms · 1178KB · £72/mo
sgtm.rhs.org.uk
Other
Costly
Execution 989ms
Transfer 151 KB
Unused 35%
Monthly Cost £10/mo
Unattributable
Other
Costly
Execution 828ms
Transfer 0 KB
Monthly Cost £9/mo
Optimizely
A/B Testing
Costly
Execution 796ms
Transfer 141 KB
Unused 28%
Monthly Cost £8/mo
cdn-ukwest.onetrust.com
Other
Costly
Execution 616ms
Transfer 18 KB
Monthly Cost £6/mo
sgtm.rhs.org.uk
Other
Costly
Execution 593ms
Transfer 165 KB
Unused 39%
Monthly Cost £6/mo
c.amazon-adsystem.com
Other
Costly
Execution 409ms
Transfer 91 KB
Unused 40%
Monthly Cost £4/mo
cdn-ukwest.onetrust.com
Other
Costly
Execution 406ms
Transfer 118 KB
Unused 47%
Monthly Cost £4/mo
static.srcspot.com
Other
Costly
Execution 397ms
Transfer 51 KB
Unused 50%
Monthly Cost £4/mo
www.rhs.org.uk
Other
Costly
Execution 371ms
Transfer 19 KB
Monthly Cost £4/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 348ms
Transfer 188 KB
Unused 70%
Monthly Cost £4/mo
www.rhs.org.uk
Other
Costly
Execution 234ms
Transfer 3 KB
Monthly Cost £2/mo
w.usabilla.com
Other
Optional
Execution 187ms
Transfer 15 KB
Monthly Cost £2/mo
www.rhs.org.uk
Other
Optional
Execution 155ms
Transfer 4 KB
Monthly Cost £2/mo
www.rhs.org.uk
Other
Optional
Execution 153ms
Transfer 80 KB
Unused 63%
Monthly Cost £2/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 145ms
Transfer 9 KB
Monthly Cost £2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 99ms
Transfer 34 KB
Monthly Cost £1/mo
cdn1.anonymised.io
Other
Optional
Execution 81ms
Transfer 26 KB
Monthly Cost £1/mo
www.rhs.org.uk
Other
Optional
Execution 75ms
Transfer 31 KB
Monthly Cost £1/mo
tag.durationmedia.net
Other
Optional
Execution 60ms
Transfer 34 KB
Unused 63%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • sgtm.rhs.org.uk adds 989ms and costs ~£10/month
  • Unattributable adds 828ms and costs ~£9/month
  • Optimizely adds 796ms and costs ~£8/month
  • cdn-ukwest.onetrust.com adds 616ms and costs ~£6/month
  • sgtm.rhs.org.uk adds 593ms and costs ~£6/month
  • c.amazon-adsystem.com adds 409ms and costs ~£4/month
  • cdn-ukwest.onetrust.com adds 406ms and costs ~£4/month
  • static.srcspot.com adds 397ms and costs ~£4/month
  • www.rhs.org.uk adds 371ms and costs ~£4/month
  • securepubads.g.doubleclick.net adds 348ms and costs ~£4/month
  • www.rhs.org.uk adds 234ms and costs ~£2/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

sgtm.rhs.org.uk takes 989ms 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 828ms 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

Optimizely takes 796ms 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

cdn-ukwest.onetrust.com takes 616ms 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

sgtm.rhs.org.uk takes 593ms 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

c.amazon-adsystem.com takes 409ms 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

cdn-ukwest.onetrust.com takes 406ms 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

static.srcspot.com takes 397ms 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

50% of static.srcspot.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

www.rhs.org.uk takes 371ms 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

securepubads.g.doubleclick.net takes 348ms 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

70% of securepubads.g.doubleclick.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.rhs.org.uk takes 234ms 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

63% of www.rhs.org.uk'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

63% of tag.durationmedia.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

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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