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https://kew.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
79
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.
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.

1.30 s

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

2.96 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.

1.51 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.

2.97 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
15
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 57 requests
FIX
2.1 MB transferred, 57 requests
Info::
Page weighs 3.6 MB (2.1 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Info::
57 HTTP requests
Info::
Estimated 0.44 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
57 requests
0.44 g CO2 per page load
Images 1.6 MiB 76%
JavaScript 377.8 KiB 18%
CSS 37.3 KiB 2%
Fonts 36.7 KiB 2%
Other 32.0 KiB 1%
HTML 25.8 KiB 1%
Other 3.8 KiB 0%
Other 3.0 KiB 0%
Other 522 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
57 resources · 2.1 MB · 103 KB savings available
FIX
57 resources · 2.1 MB · 103 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~103 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
1 resources over 200KB
57 resources · 2.1 MiB · 56 third-party 1.1 MiB over 1MB target
Image 76% · 1.6 MiB
JavaScript 18% · 381.6 KiB
CSS 2% · 37.3 KiB
Font 2% · 36.7 KiB
Other 2% · 32.4 KiB
Document 1% · 26.3 KiB

~102.8 KiB of savings available

Remove unused JavaScript: 102.8 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.

C
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
https://www.kew.org/sites/default/files/styles/sho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.kew.org/sites/default/files/styles/sho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.kew.org/sites/default/files/styles/sho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.kew.org/sites/default/files/styles/sho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 1.6 MB
0 oversized -0 KB
7 legacy format
4 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

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

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

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

B
JS Bundles
20 scripts, 103 KB unused
REVIEW
20 scripts, 103 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WHZ...: 72 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSd...: 31 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 103 KB
103 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-WHZGP8177 KB72 KB (41%)✓3rd
https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSdk.lib.4c6726a9.js56 KB31 KB (56%)✓3rd
https://www.kew.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.127 KB—✓3rd
https://www.kew.org/themes/custom/kew_gardens/js/src/site-nav.js?tdky8u2 KB—✓3rd
https://www.kew.org/modules/contrib/google_tag/js/gtm.js?tdky8u1 KB—✓3rd
https://web.cmp.usercentrics.eu/tcf/stub.js2 KB—✓3rd
https://www.kew.org/sites/default/files/js/js_wIeOFjg-CzyadXkR9T7fRkwfrJTVOTKXAm8Pug2_tKg.js?scope=footer&delta=1&language=en&theme=kew_gardens&include=eJxlzUsOwzAIBNALOcmRLBIjTII_MnbT3r6OukJdgDRPg6BSSNB3oI3mcmTzCie8LSZ34e0JWsCsG0nZQZZTjSbgbEAR2hEtccclw8uicMDmlFOdD2upo_pdynE9_T9zg32F3rHN08gUZU5Xn0oYgqv2j6DpZLxV8AlemfKov84XySBmuA20 KB—✓3rd
https://dev.visualwebsiteoptimizer.com/j.php?a=1061784&u=https%3A%2F%2Fwww.kew.org%2F&vn=2.1&x=true4 KB—✓3rd
https://www.kew.org/themes/custom/kew_gardens/js/src/main.js?tdky8u1 KB—✓3rd
https://www.kew.org/themes/custom/kew_gardens/js/src/search.js?tdky8u1 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

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

Green Hosting

No green hosting detected

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+
JS Execution Cost
235ms total JS execution
PASS
235ms total JS execution
Info::
https://www.kew.org/: 89ms CPU time
Info::
Unattributable: 74ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WHZ...: 72ms CPU time
Warning::
Third-party scripts: 235ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 22% Style & Layout 17% Script Parsing & Compilation 9% Parse HTML & CSS 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.kew.org/89ms9ms1ms3rd
Unattributable74ms7ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHZGP872ms58ms13ms3rd
A+
Font Loading
1 fonts (37 KB)
PASS
1 fonts (37 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

37 KB total

Render-blocking

0

of 1

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 FCP 1.3 s LCP 3.0 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 48 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 48 ms
Start 414 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
Network Waterfall
57 requests over 726ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.3 s LCP 3.0 shttps://kew.org// https://kew.org/ — 301 — 386 B — 107 ms — http/1.1https://www.kew.org/www.kew.org/ https://www.kew.org/ — 200 — 25.8 KiB — 75 ms — h2https://web.cmp.usercentrics.eu/tcf/stub.jsweb.cmp.usercentrics.eu/tcf/stub.js https://web.cmp.usercentrics.eu/tcf/stub.js — 200 — 1.9 KiB — 62 ms — h2https://web.cmp.usercentrics.eu/ui/loader.jsweb.cmp.usercentrics.eu/ui/loader.j... https://web.cmp.usercentrics.eu/ui/loader.js — 200 — 15.2 KiB — 68 ms — h2https://www.kew.org/sites/default/files/css/css_LO_FkWUxtXwrGKesfrCSIywikhnx9J2OX2pSUzjHW9Q.css?delta=0&language=en&theme=kew_gardens&include=eJx1kFFuAyEMRC9ElyMhAxa468Uuhqa5fTeJoigS-QCJeTMemSQdfe5TgTf4hj-34yUU6Bmb-cISgb9sXBnNKXQoHbTaM_BSttl0RiarmJ3RoYxBRaeGyJJ28wvN2dUGHj6CoZsUFMbAftams367l77JlUrl8wwLh-TJuPAwtX0hN7wY4-0RjEqbuvD8TEp7uA2wBTVMg6StSBU9YzaolRVmytg_ghDnGNKWlQ-DdikdbemQRMDvv_FL567-fm8P8A-Zd8DFwww.kew.org/sites/default/files/css... https://www.kew.org/sites/default/files/css/css_LO_FkWUxtXwrGKesfrCSIywikhnx9J2OX2pSUzjHW9Q.css?delta=0&language=en&theme=kew_gardens&include=eJx1kFFuAyEMRC9ElyMhAxa468Uuhqa5fTeJoigS-QCJeTMemSQdfe5TgTf4hj-34yUU6Bmb-cISgb9sXBnNKXQoHbTaM_BSttl0RiarmJ3RoYxBRaeGyJJ28wvN2dUGHj6CoZsUFMbAftams367l77JlUrl8wwLh-TJuPAwtX0hN7wY4-0RjEqbuvD8TEp7uA2wBTVMg6StSBU9YzaolRVmytg_ghDnGNKWlQ-DdikdbemQRMDvv_FL567-fm8P8A-Zd8DF — 200 — 8.7 KiB — 18 ms — h2https://www.kew.org/sites/default/files/css/css_OM_7jI2EYA8GXeg0nEQNZWP4pGN_oy62pkmUXXSeVJg.css?delta=1&language=en&theme=kew_gardens&include=eJx1kFFuAyEMRC9ElyMhAxa468Uuhqa5fTeJoigS-QCJeTMemSQdfe5TgTf4hj-34yUU6Bmb-cISgb9sXBnNKXQoHbTaM_BSttl0RiarmJ3RoYxBRaeGyJJ28wvN2dUGHj6CoZsUFMbAftams367l77JlUrl8wwLh-TJuPAwtX0hN7wY4-0RjEqbuvD8TEp7uA2wBTVMg6StSBU9YzaolRVmytg_ghDnGNKWlQ-DdikdbemQRMDvv_FL567-fm8P8A-Zd8DFwww.kew.org/sites/default/files/css... https://www.kew.org/sites/default/files/css/css_OM_7jI2EYA8GXeg0nEQNZWP4pGN_oy62pkmUXXSeVJg.css?delta=1&language=en&theme=kew_gardens&include=eJx1kFFuAyEMRC9ElyMhAxa468Uuhqa5fTeJoigS-QCJeTMemSQdfe5TgTf4hj-34yUU6Bmb-cISgb9sXBnNKXQoHbTaM_BSttl0RiarmJ3RoYxBRaeGyJJ28wvN2dUGHj6CoZsUFMbAftams367l77JlUrl8wwLh-TJuPAwtX0hN7wY4-0RjEqbuvD8TEp7uA2wBTVMg6StSBU9YzaolRVmytg_ghDnGNKWlQ-DdikdbemQRMDvv_FL567-fm8P8A-Zd8DF — 200 — 25.8 KiB — 20 ms — h2https://www.kew.org/sites/default/files/js/js_JCv9eGr5Sbr8GO9o-fRgZHq_Nl4kqyQeFYw-oDQa8KA.js?scope=header&delta=0&language=en&theme=kew_gardens&include=eJxlzUsOwzAIBNALOcmRLBIjTII_MnbT3r6OukJdgDRPg6BSSNB3oI3mcmTzCie8LSZ34e0JWsCsG0nZQZZTjSbgbEAR2hEtccclw8uicMDmlFOdD2upo_pdynE9_T9zg32F3rHN08gUZU5Xn0oYgqv2j6DpZLxV8AlemfKov84XySBmuAwww.kew.org/sites/default/files/js/... https://www.kew.org/sites/default/files/js/js_JCv9eGr5Sbr8GO9o-fRgZHq_Nl4kqyQeFYw-oDQa8KA.js?scope=header&delta=0&language=en&theme=kew_gardens&include=eJxlzUsOwzAIBNALOcmRLBIjTII_MnbT3r6OukJdgDRPg6BSSNB3oI3mcmTzCie8LSZ34e0JWsCsG0nZQZZTjSbgbEAR2hEtccclw8uicMDmlFOdD2upo_pdynE9_T9zg32F3rHN08gUZU5Xn0oYgqv2j6DpZLxV8AlemfKov84XySBmuA — 200 — 522 B — 19 ms — h2https://www.kew.org/modules/contrib/google_tag/js/gtag.js?tdky8uwww.kew.org/modules/contrib/google_... https://www.kew.org/modules/contrib/google_tag/js/gtag.js?tdky8u — 200 — 898 B — 22 ms — h2https://www.kew.org/modules/contrib/google_tag/js/gtm.js?tdky8uwww.kew.org/modules/contrib/google_... https://www.kew.org/modules/contrib/google_tag/js/gtm.js?tdky8u — 200 — 822 B — 21 ms — h2https://www.kew.org/themes/custom/kew_gardens/assets/arrow-right.svgwww.kew.org/themes/custom/kew_garde... https://www.kew.org/themes/custom/kew_gardens/assets/arrow-right.svg — 200 — 686 B — 21 ms — h2https://www.kew.org/sites/default/files/styles/shop_item_image_750w/public/2026-03/il_1588xN.6366651064_95yv.jpg.webp?itok=vFaD-SFswww.kew.org/sites/default/files/sty... https://www.kew.org/sites/default/files/styles/shop_item_image_750w/public/2026-03/il_1588xN.6366651064_95yv.jpg.webp?itok=vFaD-SFs — 200 — 75.9 KiB — 21 ms — h2https://www.kew.org/sites/default/files/styles/shop_item_image_750w/public/2026-03/fraas_cottage_floral_print_silk_square_scarf_powder_mint-1.jpg.webp?itok=cAL06DRZwww.kew.org/sites/default/files/sty... https://www.kew.org/sites/default/files/styles/shop_item_image_750w/public/2026-03/fraas_cottage_floral_print_silk_square_scarf_powder_mint-1.jpg.webp?itok=cAL06DRZ — 200 — 49.6 KiB — 8 ms — h2https://www.kew.org/sites/default/files/styles/shop_item_image_750w/public/2026-03/Lemongrass-lime-1.jpg.webp?itok=JPooZK5wwww.kew.org/sites/default/files/sty... https://www.kew.org/sites/default/files/styles/shop_item_image_750w/public/2026-03/Lemongrass-lime-1.jpg.webp?itok=JPooZK5w — 200 — 125.3 KiB — 11 ms — h2https://www.kew.org/sites/default/files/styles/shop_item_image_750w/public/2026-03/Kew-Chocolates-Feb-2613100-1_0.jpg.webp?itok=TchQGJ33www.kew.org/sites/default/files/sty... https://www.kew.org/sites/default/files/styles/shop_item_image_750w/public/2026-03/Kew-Chocolates-Feb-2613100-1_0.jpg.webp?itok=TchQGJ33 — 200 — 76.8 KiB — 11 ms — h2https://www.kew.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1www.kew.org/core/assets/vendor/jque... https://www.kew.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1 — 200 — 27.3 KiB — 22 ms — h2https://www.kew.org/sites/default/files/js/js_wIeOFjg-CzyadXkR9T7fRkwfrJTVOTKXAm8Pug2_tKg.js?scope=footer&delta=1&language=en&theme=kew_gardens&include=eJxlzUsOwzAIBNALOcmRLBIjTII_MnbT3r6OukJdgDRPg6BSSNB3oI3mcmTzCie8LSZ34e0JWsCsG0nZQZZTjSbgbEAR2hEtccclw8uicMDmlFOdD2upo_pdynE9_T9zg32F3rHN08gUZU5Xn0oYgqv2j6DpZLxV8AlemfKov84XySBmuAwww.kew.org/sites/default/files/js/... https://www.kew.org/sites/default/files/js/js_wIeOFjg-CzyadXkR9T7fRkwfrJTVOTKXAm8Pug2_tKg.js?scope=footer&delta=1&language=en&theme=kew_gardens&include=eJxlzUsOwzAIBNALOcmRLBIjTII_MnbT3r6OukJdgDRPg6BSSNB3oI3mcmTzCie8LSZ34e0JWsCsG0nZQZZTjSbgbEAR2hEtccclw8uicMDmlFOdD2upo_pdynE9_T9zg32F3rHN08gUZU5Xn0oYgqv2j6DpZLxV8AlemfKov84XySBmuA — 200 — 20.0 KiB — 14 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=1061784&u=https%3A%2F%2Fwww.kew.org%2F&vn=2.1&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=1061784&u=https%3A%2F%2Fwww.kew.org%2F&vn=2.1&x=true — 200 — 3.8 KiB — 76 ms — h2https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,500,500i,700,700i,900,900ifonts.googleapis.com/css?family=Rob... https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,500,500i,700,700i,900,900i — 200 — 2.7 KiB — 102 ms — h2https://www.kew.org/themes/custom/kew_gardens/js/src/main.js?tdky8uwww.kew.org/themes/custom/kew_garde... https://www.kew.org/themes/custom/kew_gardens/js/src/main.js?tdky8u — 200 — 1.2 KiB — 17 ms — h2https://www.kew.org/themes/custom/kew_gardens/js/src/search.js?tdky8uwww.kew.org/themes/custom/kew_garde... https://www.kew.org/themes/custom/kew_gardens/js/src/search.js?tdky8u — 200 — 1.4 KiB — 18 ms — h2https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSdk.lib.4c6726a9.jsweb.cmp.usercentrics.eu/ui/v/3.117.... https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSdk.lib.4c6726a9.js — 200 — 56.2 KiB — 43 ms — h2https://www.kew.org/themes/custom/kew_gardens/js/src/site-nav.js?tdky8uwww.kew.org/themes/custom/kew_garde... 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h2https://www.kew.org/sites/default/files/styles/highlights_module_main_image_770w_/public/2026-03/Wakehurst-Mansion-Pond-in-spring.jpg.webp?itok=2XbdTl6cwww.kew.org/sites/default/files/sty... https://www.kew.org/sites/default/files/styles/highlights_module_main_image_770w_/public/2026-03/Wakehurst-Mansion-Pond-in-spring.jpg.webp?itok=2XbdTl6c — 200 — 79.3 KiB — 16 ms — h2https://www.kew.org/sites/default/files/styles/highlights_module_main_image_770w_/public/2025-09/MSB-scientists-labs.jpg.webp?itok=s-C6chBowww.kew.org/sites/default/files/sty... https://www.kew.org/sites/default/files/styles/highlights_module_main_image_770w_/public/2025-09/MSB-scientists-labs.jpg.webp?itok=s-C6chBo — 200 — 26.2 KiB — 20 ms — h2https://www.kew.org/sites/default/files/styles/read_watch_listing/public/2026-04/Ginkgo-biloba-maidenhair-autumn.jpg.webp?itok=f8A4hA6Jwww.kew.org/sites/default/files/sty... 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38 ms — h2https://web.cmp.usercentrics.eu/ui/v/3.117.0/TcfCmpController.f41ace1c.jsweb.cmp.usercentrics.eu/ui/v/3.117.... https://web.cmp.usercentrics.eu/ui/v/3.117.0/TcfCmpController.f41ace1c.js — 200 — 11.7 KiB — 21 ms — h3https://uct.service.usercentrics.eu/uct?v=2&sid=gdkzoAfLCGpK2e&t=24&abv=&r=https%3A%2F%2Fwww.kew.org%2F&cb=1776898319733uct.service.usercentrics.eu/uct?v=2... https://uct.service.usercentrics.eu/uct?v=2&sid=gdkzoAfLCGpK2e&t=24&abv=&r=https%3A%2F%2Fwww.kew.org%2F&cb=1776898319733 — 200 — 255 B — 71 ms — h2https://consent-api.service.consent.usercentrics.eu/consent/uw/3consent-api.service.consent.usercen... https://consent-api.service.consent.usercentrics.eu/consent/uw/3 — 204 — 0 B — 109 ms — h2https://web.cmp.usercentrics.eu/ui/TvGdprCmpView.35a2009d.jsweb.cmp.usercentrics.eu/ui/TvGdprCm... https://web.cmp.usercentrics.eu/ui/TvGdprCmpView.35a2009d.js — 200 — 29.6 KiB — 26 ms — h3https://web.cmp.usercentrics.eu/ui/v/3.117.0/UcTcfCmpView.d21ff1d8.jsweb.cmp.usercentrics.eu/ui/v/3.117.... https://web.cmp.usercentrics.eu/ui/v/3.117.0/UcTcfCmpView.d21ff1d8.js — 200 — 22.4 KiB — 33 ms — h3https://uct.service.usercentrics.eu/uct?v=2&sid=gdkzoAfLCGpK2e&t=1&abv=&r=https%3A%2F%2Fwww.kew.org%2F&cb=1776898319825uct.service.usercentrics.eu/uct?v=2... https://uct.service.usercentrics.eu/uct?v=2&sid=gdkzoAfLCGpK2e&t=1&abv=&r=https%3A%2F%2Fwww.kew.org%2F&cb=1776898319825 — 200 — 113 B — 39 ms — h2https://web.cmp.usercentrics.eu/ui/v/3.117.0/secondLayer.b796d0f0.jsweb.cmp.usercentrics.eu/ui/v/3.117.... https://web.cmp.usercentrics.eu/ui/v/3.117.0/secondLayer.b796d0f0.js — 200 — 3.0 KiB — 21 ms — h3https://consent-api.service.consent.usercentrics.eu/consent/uw/3consent-api.service.consent.usercen... https://consent-api.service.consent.usercentrics.eu/consent/uw/3 — 201 — 74 B — 57 ms — h2https://web.cmp.usercentrics.eu/ui/v/3.117.0/getToastifyStyle.4f0a73d7.jsweb.cmp.usercentrics.eu/ui/v/3.117.... https://web.cmp.usercentrics.eu/ui/v/3.117.0/getToastifyStyle.4f0a73d7.js — 200 — 714 B — 20 ms — h3data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2248%22%2…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2248%22%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2248%22%2…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2248%22%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2248%22%2…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2248%22%2… — 200 — 0 B — 0 ms — datahttps://www.kew.org/themes/custom/kew_gardens/assets/favicons/favicon.ico?v=m2LpNRgJL8www.kew.org/themes/custom/kew_garde... https://www.kew.org/themes/custom/kew_gardens/assets/favicons/favicon.ico?v=m2LpNRgJL8 — 200 — 2.6 KiB — 11 ms — h2
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 235ms · 203KB · £2/mo
www.kew.org
Other
Optional
Execution 89ms
Transfer 26 KB
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 74ms
Transfer 0 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 177 KB
Unused 41%
Monthly Cost £1/mo

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

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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