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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
63
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.

1.39 s

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

2.34 s

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

418 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.005

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.80 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.

4.75 s

Page Load Progression

556 ms
1.1 s
1.7 s
2.2 s
2.8 s
3.3 s
3.9 s
4.4 s
Checks
15
6 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.6 MB transferred, 104 requests
FIX
2.6 MB transferred, 104 requests
Warning::
Page weighs 7.0 MB (2.6 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
Warning::
104 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.53 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
104 requests
0.53 g CO2 per page load
JavaScript 1.3 MiB 50%
Images 797.4 KiB 31%
Fonts 215.3 KiB 8%
Other 140.1 KiB 5%
CSS 87.7 KiB 3%
Other 24.6 KiB 1%
HTML 21.6 KiB 1%
Other 7.9 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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 (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
40 scripts, 521 KB unused
FIX
40 scripts, 521 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 130 KB unused (69%)
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: 521 KB
521 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964188 KB130 KB (69%)✓3rd
https://sgtm.rhs.org.uk/gtag/js?id=G-X9Q3NCQ40M&cx=c&gtm=4e64k0&sign=19eeaa803968de4e95ebf6f694872224b710f7d9aa8c1615862362e804f76ef3_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 KB37 KB (41%)✓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
104 resources · 2.6 MB · 521 KB savings available
FIX
104 resources · 2.6 MB · 521 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~521 KB of savings available
Warning::
103 third-party resources (100% of weight)
104 resources · 2.6 MiB · 103 third-party 1.6 MiB over 1MB target
JavaScript 55% · 1.4 MiB
Image 31% · 799.0 KiB
Font 8% · 215.3 KiB
CSS 4% · 92.2 KiB
Other 2% · 43.7 KiB
Document 1% · 21.6 KiB

~520.9 KiB of savings available

Remove unused JavaScript: 520.9 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
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 797 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1600ms total JS execution
REVIEW
1600ms total JS execution
Warning::
https://www.rhs.org.uk/: 255ms CPU time
Info::
https://sgtm.rhs.org.uk/gtm.js?id=GTM-KLMZK7V&gtm_...: 222ms CPU time
Info::
Unattributable: 214ms CPU time
Info::
https://cdn.optimizely.com/js/22397541806.js: 194ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 134ms CPU time
Warning::
Third-party scripts: 1600ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Other 15% Script Parsing & Compilation 9% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.rhs.org.uk/255ms14ms2ms3rd
https://sgtm.rhs.org.uk/gtm.js?id=GTM-KLMZK7V&gtm_auth=kQdgmT7CzoPxddBc8XfCqg&gtm_preview=env-1&gtm_cookies_win=x222ms197ms19ms3rd
Unattributable214ms26ms0ms3rd
https://cdn.optimizely.com/js/22397541806.js194ms159ms21ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202504.1.0/otTCF.js134ms121ms2ms3rd
https://c.amazon-adsystem.com/aax2/apstag.js131ms115ms12ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964127ms92ms24ms3rd
https://sgtm.rhs.org.uk/gtag/js?id=G-X9Q3NCQ40M&cx=c&gtm=4e64k0&sign=19eeaa803968de4e95ebf6f694872224b710f7d9aa8c1615862362e804f76ef3_20260422113ms95ms17ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202504.1.0/otBannerSdk.js102ms60ms17ms3rd
https://static.srcspot.com/libs/isa.js57ms49ms4ms3rd

Showing top 10 of 11 scripts

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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.4 s LCP 2.3 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 — 63 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 — 68 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 — 70 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 — 67 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 — 68 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 — 68 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 — 34 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 — 27 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 — 37 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 — 25 ms — font-display: swap
gt-super-text-black.woff2 woff2 swap
Size 61 KB
Load time 63 ms
Start 240 ms
Risk FOUT — text flashes from fallback to web font
freigsanproboo-webfont.... woff2 swap
Size 27 KB
Load time 68 ms
Start 240 ms
Risk FOUT — text flashes from fallback to web font
rhs-icons.woff2 woff2 swap
Size 20 KB
Load time 70 ms
Start 240 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 3 KB
Load time 67 ms
Start 241 ms
Risk FOUT — text flashes from fallback to web font
fa-light-300.woff2 woff2 swap
Size 7 KB
Load time 68 ms
Start 241 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 8 KB
Load time 68 ms
Start 242 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 9 KB
Load time 34 ms
Start 242 ms
Risk FOUT — text flashes from fallback to web font
freigsanprosem-webfont.... woff2 swap
Size 29 KB
Load time 27 ms
Start 677 ms
Risk FOUT — text flashes from fallback to web font
freigsanprolig-webfont.... woff2 swap
Size 25 KB
Load time 37 ms
Start 678 ms
Risk FOUT — text flashes from fallback to web font
freigsanproligita-webfo... woff2 swap
Size 26 KB
Load time 25 ms
Start 885 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
104 requests over 6281ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 1.4 s LCP 2.3 shttps://rhs.org.uk// https://rhs.org.uk/ — 301 — 194 B — 11 ms — h3https://www.rhs.org.uk/www.rhs.org.uk/ https://www.rhs.org.uk/ — 200 — 18.9 KiB — 295 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 — 16 ms — h3https://static.srcspot.com/libs/isa.jsstatic.srcspot.com/libs/isa.js https://static.srcspot.com/libs/isa.js — 200 — 50.9 KiB — 44 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 — 51 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 — 51 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 — 33 ms — h2https://cdn.optimizely.com/js/22397541806.jscdn.optimizely.com/js/22397541806.j... https://cdn.optimizely.com/js/22397541806.js — 200 — 141.2 KiB — 59 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 — 51 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 — 44 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 — 51 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 — 59 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 — 30 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 — 63 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 — 68 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 — 70 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 — 67 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 — 68 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 — 68 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 — 34 ms — h3https://www.rhs.org.uk/WebResource.axd?d=pynGkmcFUV13He1Qd6_TZIVQ8PcboCeHzUupuwCs7ifCVGyNxMVOYf_wQd4jdSG4yMBmk2SUDc8fSl9ojJny9g2&t=638901572248157332www.rhs.org.uk/WebResource.axd?d=py... https://www.rhs.org.uk/WebResource.axd?d=pynGkmcFUV13He1Qd6_TZIVQ8PcboCeHzUupuwCs7ifCVGyNxMVOYf_wQd4jdSG4yMBmk2SUDc8fSl9ojJny9g2&t=638901572248157332 — 200 — 4.9 KiB — 213 ms — h3https://www.rhs.org.uk/ScriptResource.axd?d=x6wALODbMJK5e0eRC_p1LRGkrcPBcw5ce5OX7pd8u_5JrQQ3mzQmuUNxkbII6OOZRWZpsQSSZU2_N-HqtmdJge2UlBsCAC-y7YqaEaGcdFdA94ND6_dLmizVU_ICPWRr0&t=7c776dc1www.rhs.org.uk/ScriptResource.axd?d... https://www.rhs.org.uk/ScriptResource.axd?d=x6wALODbMJK5e0eRC_p1LRGkrcPBcw5ce5OX7pd8u_5JrQQ3mzQmuUNxkbII6OOZRWZpsQSSZU2_N-HqtmdJge2UlBsCAC-y7YqaEaGcdFdA94ND6_dLmizVU_ICPWRr0&t=7c776dc1 — 200 — 27.5 KiB — 215 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
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sgtm.rhs.org.uk
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Costly
Execution 222ms
Transfer 151 KB
Unused 35%
Monthly Cost £2/mo
Unattributable
Other
Costly
Execution 214ms
Transfer 0 KB
Monthly Cost £2/mo
Optimizely
A/B Testing
Optional
Execution 194ms
Transfer 141 KB
Unused 28%
Monthly Cost £2/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 134ms
Transfer 18 KB
Monthly Cost £1/mo
c.amazon-adsystem.com
Other
Optional
Execution 131ms
Transfer 91 KB
Unused 41%
Monthly Cost £1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 127ms
Transfer 188 KB
Unused 69%
Monthly Cost £1/mo
sgtm.rhs.org.uk
Other
Optional
Execution 113ms
Transfer 165 KB
Unused 39%
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 102ms
Transfer 118 KB
Unused 47%
Monthly Cost £1/mo
static.srcspot.com
Other
Optional
Execution 57ms
Transfer 51 KB
Unused 50%
Monthly Cost £1/mo
w.usabilla.com
Other
Optional
Execution 51ms
Transfer 16 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.rhs.org.uk adds 255ms and costs ~£3/month
  • sgtm.rhs.org.uk adds 222ms and costs ~£2/month
  • Unattributable adds 214ms 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

www.rhs.org.uk takes 255ms 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 222ms 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 214ms 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

69% 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

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

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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