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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
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.
79
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.
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.

1.09 s

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

3.29 s

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

24 ms

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

0.051

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

1.23 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.

3.40 s

Page Load Progression

377 ms
754 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 64 requests
FIX
3.1 MB transferred, 64 requests
Warning::
Page weighs 6.8 MB (3.1 MB transferred)
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
64 HTTP requests
Info::
Estimated 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
64 requests
0.65 g CO2 per page load
JavaScript 1.8 MiB 58%
Images 1.1 MiB 34%
Other 135.5 KiB 4%
Fonts 79.6 KiB 2%
CSS 31.9 KiB 1%
HTML 12.1 KiB 0%
Other 2.1 KiB 0%
Other 146 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

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
64 resources · 3.1 MB · 29 KB savings available
FIX
64 resources · 3.1 MB · 29 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Warning::
63 third-party resources (100% of weight)
Info::
4 resources over 200KB
64 resources · 3.1 MiB · 63 third-party 2.1 MiB over 1MB target
JavaScript 58% · 1.8 MiB
Image 34% · 1.1 MiB
Media 4% · 135.5 KiB
Font 2% · 79.6 KiB
CSS 1% · 31.9 KiB
Document 0% · 12.3 KiB
Other 0% · 146 B

~29.2 KiB of savings available

Remove unused JavaScript: 29.2 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.cochrane.org/themes/custom/cochrane_hs... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochrane.org/themes/custom/cochrane_hs... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 1.1 MB
0 oversized -0 KB
16 legacy format
2 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

B
JS Execution Cost
527ms total JS execution
REVIEW
527ms total JS execution
Info::
https://www.cochrane.org/: 218ms CPU time
Info::
https://www.cochrane.org/libraries/fontawesome/js/...: 97ms CPU time
Info::
Unattributable: 90ms CPU time
Info::
https://www.cochrane.org/libraries/fontawesome/js/...: 71ms CPU time
Info::
https://cdn.matomo.cloud/cochrane-org.matomo.cloud...: 50ms CPU time
Warning::
Third-party scripts: 527ms (100% of total)

Main Thread Breakdown

Script Evaluation 27% Other 22% Style & Layout 20% Script Parsing & Compilation 19% Rendering 8%
ScriptTotalScriptingParse/CompileParty
https://www.cochrane.org/218ms3ms1ms3rd
https://www.cochrane.org/libraries/fontawesome/js/solid.min.js?v=6.4.297ms50ms40ms3rd
Unattributable90ms4ms0ms3rd
https://www.cochrane.org/libraries/fontawesome/js/regular.min.js?v=6.4.271ms16ms54ms3rd
https://cdn.matomo.cloud/cochrane-org.matomo.cloud/matomo.js50ms45ms5ms3rd
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+
Font Loading
6 fonts (80 KB)
PASS
6 fonts (80 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

80 KB total

Render-blocking

0

of 6

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 1.1 s LCP 3.3 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 30 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu3cOWxw.woff2 — 14.5 KiB — 37 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 54 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2 — 14.6 KiB — 41 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff26xK1dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff2 — 13.9 KiB — 64 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwkxdu3cOWxy40.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwkxdu3cOWxy40.woff2 — 7.7 KiB — 59 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 30 ms
Start 297 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 37 ms
Start 298 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 54 ms
Start 298 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 41 ms
Start 298 ms
Risk FOUT — text flashes from fallback to web font
6xK1dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 64 ms
Start 298 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 8 KB
Load time 59 ms
Start 299 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
JS Bundles
24 scripts, 29 KB unused
PASS
24 scripts, 29 KB unused
Warning::
https://cdn.matomo.cloud/cochrane-org.matomo.cloud...: 29 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cochrane.org/core/misc/drupal.js?v=10....: unminified — 5 KB could be saved
Info::
Total unused JavaScript: 29 KB
29 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.matomo.cloud/cochrane-org.matomo.cloud/matomo.js57 KB29 KB (52%)✓3rd
https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/widgets/autocomplete-min.js?v=1.13.23 KB—✓3rd
https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/unique-id-min.js?v=1.13.21 KB—✓3rd
https://www.cochrane.org/core/misc/drupal.js?v=10.6.76 KB—✗3rd
https://www.cochrane.org/core/misc/drupal.init.js?v=10.6.71 KB—✓3rd
https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/version-min.js?v=1.13.21 KB—✓3rd
https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/keycode-min.js?v=1.13.21 KB—✓3rd
https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/position-min.js?v=1.13.23 KB—✓3rd
https://www.cochrane.org/themes/custom/cochrane_hs/js/cards.min.js?v=11 KB—✓3rd
https://www.cochrane.org/core/assets/vendor/jquery/jquery.min.js?v=3.7.130 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

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
64 requests over 885ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.3 shttps://cochrane.org// https://cochrane.org/ — 301 — 219 B — 86 ms — h2https://www.cochrane.org/www.cochrane.org/ https://www.cochrane.org/ — 200 — 12.1 KiB — 31 ms — h2https://www.cochrane.org/sites/default/files/css/css_Rk1cJTuP-NXP2mQ-wB3DQTHWwzgtrxDQxiiXtZ2xMM4.css?delta=0&language=en&theme=cochrane_hs&include=eJxtjksOgzAMBS-UkiNZTnAJyMTGnwW3L7t20eUbzUgP3Slgnwf1EKvdfQk6FUIUTppZ8J_gAW-TGaC4UenSh-EkGF43lob88riZvBxXkt2QO2CGdDmVKaj-jqJouBnqE6-Wirx8yZJTs_Hug9bitz_XakOnDwJ6SJcwww.cochrane.org/sites/default/file... https://www.cochrane.org/sites/default/files/css/css_Rk1cJTuP-NXP2mQ-wB3DQTHWwzgtrxDQxiiXtZ2xMM4.css?delta=0&language=en&theme=cochrane_hs&include=eJxtjksOgzAMBS-UkiNZTnAJyMTGnwW3L7t20eUbzUgP3Slgnwf1EKvdfQk6FUIUTppZ8J_gAW-TGaC4UenSh-EkGF43lob88riZvBxXkt2QO2CGdDmVKaj-jqJouBnqE6-Wirx8yZJTs_Hug9bitz_XakOnDwJ6SJc — 200 — 4.4 KiB — 32 ms — h2https://www.cochrane.org/sites/default/files/css/css_hJNlgQ9RAnanIsDUMSk_rlY7eoQZh7IUxcUvct3G6js.css?delta=1&language=en&theme=cochrane_hs&include=eJxtjksOgzAMBS-UkiNZTnAJyMTGnwW3L7t20eUbzUgP3Slgnwf1EKvdfQk6FUIUTppZ8J_gAW-TGaC4UenSh-EkGF43lob88riZvBxXkt2QO2CGdDmVKaj-jqJouBnqE6-Wirx8yZJTs_Hug9bitz_XakOnDwJ6SJcwww.cochrane.org/sites/default/file... https://www.cochrane.org/sites/default/files/css/css_hJNlgQ9RAnanIsDUMSk_rlY7eoQZh7IUxcUvct3G6js.css?delta=1&language=en&theme=cochrane_hs&include=eJxtjksOgzAMBS-UkiNZTnAJyMTGnwW3L7t20eUbzUgP3Slgnwf1EKvdfQk6FUIUTppZ8J_gAW-TGaC4UenSh-EkGF43lob88riZvBxXkt2QO2CGdDmVKaj-jqJouBnqE6-Wirx8yZJTs_Hug9bitz_XakOnDwJ6SJc — 200 — 22.3 KiB — 35 ms — h2https://www.cochrane.org/sites/default/files/css/css_zLhn-S3SMWGEyMR11kO6ypf5QTcEaJI-ugcA_fHKeug.css?delta=3&language=en&theme=cochrane_hs&include=eJxtjksOgzAMBS-UkiNZTnAJyMTGnwW3L7t20eUbzUgP3Slgnwf1EKvdfQk6FUIUTppZ8J_gAW-TGaC4UenSh-EkGF43lob88riZvBxXkt2QO2CGdDmVKaj-jqJouBnqE6-Wirx8yZJTs_Hug9bitz_XakOnDwJ6SJcwww.cochrane.org/sites/default/file... https://www.cochrane.org/sites/default/files/css/css_zLhn-S3SMWGEyMR11kO6ypf5QTcEaJI-ugcA_fHKeug.css?delta=3&language=en&theme=cochrane_hs&include=eJxtjksOgzAMBS-UkiNZTnAJyMTGnwW3L7t20eUbzUgP3Slgnwf1EKvdfQk6FUIUTppZ8J_gAW-TGaC4UenSh-EkGF43lob88riZvBxXkt2QO2CGdDmVKaj-jqJouBnqE6-Wirx8yZJTs_Hug9bitz_XakOnDwJ6SJc — 200 — 983 B — 34 ms — h2https://www.cochrane.org/sites/default/files/asset_injector/css/test_front_page-7d60754035ab82206ad314e11c34c6f1.css?tdslhvwww.cochrane.org/sites/default/file... https://www.cochrane.org/sites/default/files/asset_injector/css/test_front_page-7d60754035ab82206ad314e11c34c6f1.css?tdslhv — 200 — 1.3 KiB — 57 ms — h2https://www.cochrane.org/themes/custom/cochrane_hs/img/logo.pngwww.cochrane.org/themes/custom/coch... https://www.cochrane.org/themes/custom/cochrane_hs/img/logo.png — 200 — 11.7 KiB — 57 ms — h2https://www.cochrane.org/themes/custom/cochrane_hs/img/logo-white.pngwww.cochrane.org/themes/custom/coch... https://www.cochrane.org/themes/custom/cochrane_hs/img/logo-white.png — 200 — 8.6 KiB — 57 ms — h2https://www.cochrane.org/core/assets/vendor/jquery/jquery.min.js?v=3.7.1www.cochrane.org/core/assets/vendor... https://www.cochrane.org/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 — 200 — 30.1 KiB — 34 ms — h2https://www.cochrane.org/core/assets/vendor/once/once.min.js?v=1.0.1www.cochrane.org/core/assets/vendor... https://www.cochrane.org/core/assets/vendor/once/once.min.js?v=1.0.1 — 200 — 1.1 KiB — 31 ms — h2https://www.cochrane.org/core/misc/drupalSettingsLoader.js?v=10.6.7www.cochrane.org/core/misc/drupalSe... https://www.cochrane.org/core/misc/drupalSettingsLoader.js?v=10.6.7 — 200 — 812 B — 31 ms — h2https://fonts.googleapis.com/css?family=Source+Sans+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swap&subset=latin,latin-extfonts.googleapis.com/css?family=Sou... https://fonts.googleapis.com/css?family=Source+Sans+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swap&subset=latin,latin-ext — 200 — 1.4 KiB — 71 ms — h2https://www.cochrane.org/core/misc/drupal.js?v=10.6.7www.cochrane.org/core/misc/drupal.j... https://www.cochrane.org/core/misc/drupal.js?v=10.6.7 — 200 — 6.5 KiB — 32 ms — h2https://www.cochrane.org/core/misc/drupal.init.js?v=10.6.7www.cochrane.org/core/misc/drupal.i... https://www.cochrane.org/core/misc/drupal.init.js?v=10.6.7 — 200 — 909 B — 30 ms — h2https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/version-min.js?v=1.13.2www.cochrane.org/modules/contrib/jq... https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/version-min.js?v=1.13.2 — 200 — 617 B — 32 ms — h2https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/keycode-min.js?v=1.13.2www.cochrane.org/modules/contrib/jq... https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/keycode-min.js?v=1.13.2 — 200 — 839 B — 30 ms — h2https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/position-min.js?v=1.13.2www.cochrane.org/modules/contrib/jq... https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/position-min.js?v=1.13.2 — 200 — 2.7 KiB — 31 ms — h2https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/safe-active-element-min.js?v=1.13.2www.cochrane.org/modules/contrib/jq... https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/safe-active-element-min.js?v=1.13.2 — 200 — 680 B — 32 ms — h2https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/unique-id-min.js?v=1.13.2www.cochrane.org/modules/contrib/jq... https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/unique-id-min.js?v=1.13.2 — 200 — 815 B — 30 ms — h2https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/widget-min.js?v=1.13.2www.cochrane.org/modules/contrib/jq... https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/widget-min.js?v=1.13.2 — 200 — 3.5 KiB — 31 ms — h2https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/widgets/menu-min.js?v=1.13.2www.cochrane.org/modules/contrib/jq... https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/widgets/menu-min.js?v=1.13.2 — 200 — 3.5 KiB — 32 ms — h2https://www.cochrane.org/modules/contrib/jquery_ui/assets/vendor/jquery.ui/ui/widgets/autocomplete-min.js?v=1.13.2www.cochrane.org/modules/contrib/jq... 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https://cochrane-org.matomo.cloud/matomo.php?action_name=Statistics%20that%20save%20lives%20%7C%20Cochrane&idsite=1&rec=1&r=392911&h=0&m=21&s=34&url=https%3A%2F%2Fwww.cochrane.org%2F&_id=&_idn=1&send_image=0&_refts=0&pv_id=OJ1wAB&fa_pv=1&fa_fp[0][fa_vid]=0cuB8R&fa_fp[0][fa_id]=main-search&fa_fp[0][fa_fv]=1&pf_net=0&pf_srv=29&pf_tfr=2&pf_dm1=279&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22147.0.7727.101%22%7D%2C%7B%22brand%22%3A%22Not.A%2FBrand%22%2C%22version%22%3A%228.0.0.0%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600 — 204 — 146 B — 203 ms — h2https://cochrane-org.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=1&trackerid=qpPvuX&url=https%3A%2F%2Fwww.cochrane.org%2Fcochrane-org.matomo.cloud/plugins/H... 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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 527ms · 1567KB · £5/mo
www.cochrane.org
Other
Costly
Execution 218ms
Transfer 12 KB
Monthly Cost £2/mo
www.cochrane.org
Other
Optional
Execution 97ms
Transfer 663 KB
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 90ms
Transfer 0 KB
Monthly Cost £1/mo
www.cochrane.org
Other
Optional
Execution 71ms
Transfer 835 KB
Monthly Cost £1/mo
Matomo
Analytics
Optional
Execution 50ms
Transfer 57 KB
Unused 52%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.cochrane.org adds 218ms 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.cochrane.org takes 218ms 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

52% of Matomo'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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