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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
17
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.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

5.23 s

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

8.22 s

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

817 ms

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

0.895

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

6.17 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.

13.50 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 2 REVIEW 5 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
F
JS Execution Cost
Action
4150ms total JS execution
FIX
4150ms total JS execution
Warning::
https://www.cochranelibrary.com/: 1000ms CPU time
Warning::
https://cmp.osano.com/AzZdRbSORDOOzF9W/d594efc1-96...: 884ms CPU time
Warning::
Unattributable: 682ms CPU time
Warning::
https://www.cochranelibrary.com/cochrane-theme/js/...: 530ms CPU time
Info::
https://assets.adobedtm.com/59640f9fa510/7cad07cf7...: 248ms CPU time
Warning::
Third-party scripts: 4150ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 20% Style & Layout 12% Script Parsing & Compilation 6% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.cochranelibrary.com/1000ms129ms11ms3rd
https://cmp.osano.com/AzZdRbSORDOOzF9W/d594efc1-9663-477d-9528-6576640e64fd/osano.js884ms763ms21ms3rd
Unattributable682ms88ms0ms3rd
https://www.cochranelibrary.com/cochrane-theme/js/theme.js?t=1776315578000530ms401ms62ms3rd
https://assets.adobedtm.com/59640f9fa510/7cad07cf7779/launch-a215d9c51521.min.js248ms196ms22ms3rd
https://www.cochranelibrary.com/cdn-cgi/challenge-platform/scripts/jsd/main.js235ms224ms3ms3rd
https://www.cochranelibrary.com/html/js/barebone.jsp?browserId=other&themeId=cochrane_WAR_cochranetheme&colorSchemeId=01&minifierType=js&minifierBundleId=javascript.barebone.files&languageId=en_US&b=6210&t=1559916434000163ms116ms35ms3rd
https://www.googletagmanager.com/gtag/js?id=G-BRLBHKT9XF&l=gDataLayer&cx=c&gtm=4e64k0149ms114ms35ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-189672-63&l=gDataLayer103ms75ms28ms3rd
https://injections.readcube.com/cochrane/epdf_linker.8c0d96d8.js78ms45ms5ms3rd

Showing top 10 of 11 scripts

D
JS Bundles
Action
55 scripts, 360 KB unused
FIX
55 scripts, 360 KB unused
Warning::
https://www.cochranelibrary.com/cochrane-theme/js/...: 113 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BRLB...: 69 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cochranelibrary.com/html/js/barebone.j...: 67 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-189...: 64 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/59640f9fa510/7cad07cf7...: 25 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 360 KB
360 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.cochranelibrary.com/cochrane-theme/js/theme.js?t=1776315578000178 KB113 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-BRLBHKT9XF&l=gDataLayer&cx=c&gtm=4e64k0145 KB69 KB (48%)✓3rd
https://www.cochranelibrary.com/html/js/barebone.jsp?browserId=other&themeId=cochrane_WAR_cochranetheme&colorSchemeId=01&minifierType=js&minifierBundleId=javascript.barebone.files&languageId=en_US&b=6210&t=1559916434000122 KB67 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-189672-63&l=gDataLayer125 KB64 KB (51%)✓3rd
https://assets.adobedtm.com/59640f9fa510/7cad07cf7779/launch-a215d9c51521.min.js60 KB25 KB (42%)✓3rd
https://cmp.osano.com/AzZdRbSORDOOzF9W/d594efc1-9663-477d-9528-6576640e64fd/osano.js64 KB22 KB (35%)✓3rd
https://www.cochranelibrary.com/scolaris-content-display/js/ui.submit.failed.js?browserId=other&minifierType=js&languageId=en_US&b=6210&t=17763156220000 KB—✓3rd
https://www.cochranelibrary.com/notifications-portlet/notifications/js/main.js?browserId=other&minifierType=js&languageId=en_US&b=6210&t=17763156220003 KB—✓3rd
https://www.cochranelibrary.com/html/portlet/dynamic_data_mapping/js/main.js?browserId=other&minifierType=js&languageId=en_US&b=6210&t=17763156900004 KB—✓3rd
https://www.cochranelibrary.com/cochrane-theme/vendor/ie9.js?t=177631557800010 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

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
119 resources · 1.9 MB · 360 KB savings available
FIX
119 resources · 1.9 MB · 360 KB savings available
Warning::
Page weight 880 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~360 KB of savings available
Warning::
118 third-party resources (100% of weight)
119 resources · 1.9 MiB · 118 third-party 880.2 KiB over 1MB target
JavaScript 48% · 917.4 KiB
Image 36% · 687.7 KiB
Font 8% · 150.7 KiB
CSS 6% · 119.7 KiB
Document 1% · 22.1 KiB
Other 0% · 6.7 KiB

~360.2 KiB of savings available

Remove unused JavaScript: 360.2 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
Page Weight Budget
Action
1.9 MB transferred, 119 requests
REVIEW
1.9 MB transferred, 119 requests
Info::
Page weighs 4.6 MB (1.9 MB transferred)
Warning::
JavaScript is 917 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 917 KB
Warning::
119 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.39 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
119 requests
0.39 g CO2 per page load
JavaScript 917.4 KiB 48%
Images 686.4 KiB 36%
Fonts 150.7 KiB 8%
CSS 119.7 KiB 6%
HTML 21.6 KiB 1%
Other 5.5 KiB 0%
Other 3.0 KiB 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

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

C
Image Optimization
Action
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/image/journal/arti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/image/journal/arti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/image/journal/arti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/image/journal/arti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/image/journal/arti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cochranelibrary.com/cochrane-theme/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 686 KB
0 oversized -0 KB
6 legacy format
16 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

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

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

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

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 (151 KB)
PASS
5 fonts (151 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

151 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 5.0 s 6.0 s 7.0 s 8.0 s FCP 5.2 s LCP 8.2 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 29 ms — font-display: swaphttps://www.cochranelibrary.com/cochrane-theme/fonts/fontawesome-webfont.woff2?v=4.6.3fontawesome-webfont.woff2 https://www.cochranelibrary.com/cochrane-theme/fonts/fontawesome-webfont.woff2?v=4.6.3 — 70.4 KiB — 78 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 — 41 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 — 34 ms — font-display: swaphttps://www.cochranelibrary.com/cochrane-theme/fonts/fontawesome-alloy.wofffontawesome-alloy.woff https://www.cochranelibrary.com/cochrane-theme/fonts/fontawesome-alloy.woff — 36.7 KiB — 72 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 29 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 unknown swap
Size 70 KB
Load time 78 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 41 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 34 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
fontawesome-alloy.woff woff swap
Size 37 KB
Load time 72 ms
Start 1.6 s
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 ~32 KB and ~64 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
119 requests over 2618ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 5.2 s LCP 8.2 shttps://cochranelibrary.com// https://cochranelibrary.com/ — 301 — 465 B — 188 ms — h2https://www.cochranelibrary.com/www.cochranelibrary.com/ https://www.cochranelibrary.com/ — 302 — 208 B — 152 ms — h2https://www.cochranelibrary.com/?cookiesEnabledwww.cochranelibrary.com/?cookiesEna... https://www.cochranelibrary.com/?cookiesEnabled — 302 — 133 B — 312 ms — h2https://www.cochranelibrary.com/www.cochranelibrary.com/ https://www.cochranelibrary.com/ — 200 — 20.2 KiB — 319 ms — h2https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700,600,900fonts.googleapis.com/css?family=Sou... https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700,600,900 — 200 — 1.3 KiB — 93 ms — h2https://www.cochranelibrary.com/cochrane-theme/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315578000www.cochranelibrary.com/cochrane-th... https://www.cochranelibrary.com/cochrane-theme/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315578000 — -1 — 0 B — 84 ms — https://www.cochranelibrary.com/cochrane-theme/css/aui.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315578000www.cochranelibrary.com/cochrane-th... https://www.cochranelibrary.com/cochrane-theme/css/aui.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315578000 — -1 — 0 B — 57 ms — https://cmp.osano.com/AzZdRbSORDOOzF9W/d594efc1-9663-477d-9528-6576640e64fd/osano.jscmp.osano.com/AzZdRbSORDOOzF9W/d594... https://cmp.osano.com/AzZdRbSORDOOzF9W/d594efc1-9663-477d-9528-6576640e64fd/osano.js — 200 — 63.9 KiB — 311 ms — h3https://static.addtoany.com/menu/page.jsstatic.addtoany.com/menu/page.js https://static.addtoany.com/menu/page.js — 200 — 2.2 KiB — 87 ms — h3https://www.googletagmanager.com/gtag/js?id=UA-189672-63&l=gDataLayerwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-189672-63&l=gDataLayer — 200 — 125.2 KiB — 145 ms — h2https://www.cochranelibrary.com/html/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315588000www.cochranelibrary.com/html/css/ma... https://www.cochranelibrary.com/html/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315588000 — 200 — 20.3 KiB — 93 ms — h2https://www.cochranelibrary.com/html/portlet/journal_content/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315690000www.cochranelibrary.com/html/portle... https://www.cochranelibrary.com/html/portlet/journal_content/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315690000 — 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https://www.cochranelibrary.com/combo/?browserId=other&minifierType=&languageId=en_US&b=6210&t=1559916434000&/html/js/aui/aui-button-search-cancel/aui-button-search-cancel-min.js — 200 — 990 B — 40 ms — h2https://injections.readcube.com/html/track_epdf.1af9d505.html?action=Link&publisher=cochrane&status=Unsupported%20mobile%20deviceinjections.readcube.com/html/track_... https://injections.readcube.com/html/track_epdf.1af9d505.html?action=Link&publisher=cochrane&status=Unsupported%20mobile%20device — 200 — 435 B — 60 ms — h3https://wileypublishing.112.2o7.net/b/ss/wileyclibhighwire/1/JS-2.27.0-LGPQ/s621859722727?AQB=1&ndh=1&pf=1&t=22%2F3%2F2026%2020%3A6%3A3%203%200&ce=UTF-8&pageName=Cochrane%20reviews%20%7C%20Cochrane%20Library&g=https%3A%2F%2Fwww.cochranelibrary.com%2F&c.&getValOnce=3.0.1&apl=4.0&inList=3.0&.c&cc=USD&ch=Marketing&c1=Marketing&c2=Home%20Page&c3=Cochrane%20reviews&c4=en&v12=D%3Dc61&c13=D%3Dv3&c16=D%3Dc15&c52=None&c61=EAL00000158868&c62=D%3Dc61&c63=None&c64=None&c65=Guest&s=412x823&c=24&j=1.6&v=N&k=N&bw=412&bh=823&AQE=1wileypublishing.112.2o7.net/b/ss/wi... https://wileypublishing.112.2o7.net/b/ss/wileyclibhighwire/1/JS-2.27.0-LGPQ/s621859722727?AQB=1&ndh=1&pf=1&t=22%2F3%2F2026%2020%3A6%3A3%203%200&ce=UTF-8&pageName=Cochrane%20reviews%20%7C%20Cochrane%20Library&g=https%3A%2F%2Fwww.cochranelibrary.com%2F&c.&getValOnce=3.0.1&apl=4.0&inList=3.0&.c&cc=USD&ch=Marketing&c1=Marketing&c2=Home%20Page&c3=Cochrane%20reviews&c4=en&v12=D%3Dc61&c13=D%3Dv3&c16=D%3Dc15&c52=None&c61=EAL00000158868&c62=D%3Dc61&c63=None&c64=None&c65=Guest&s=412x823&c=24&j=1.6&v=N&k=N&bw=412&bh=823&AQE=1 — 302 — 779 B — 95 ms — h2https://injections.readcube.com/assets/track_epdf.8e95d447.jsinjections.readcube.com/assets/trac... https://injections.readcube.com/assets/track_epdf.8e95d447.js — 200 — 1.4 KiB — 38 ms — h3https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 98 ms — h2https://wileypublishing.112.2o7.net/b/ss/wileyclibhighwire/1/JS-2.27.0-LGPQ/s621859722727?AQB=1&pccr=true&ndh=1&pf=1&t=22%2F3%2F2026%2020%3A6%3A3%203%200&ce=UTF-8&pageName=Cochrane%20reviews%20%7C%20Cochrane%20Library&g=https%3A%2F%2Fwww.cochranelibrary.com%2F&c.&getValOnce=3.0.1&apl=4.0&inList=3.0&.c&cc=USD&ch=Marketing&c1=Marketing&c2=Home%20Page&c3=Cochrane%20reviews&c4=en&v12=D%3Dc61&c13=D%3Dv3&c16=D%3Dc15&c52=None&c61=EAL00000158868&c62=D%3Dc61&c63=None&c64=None&c65=Guest&s=412x823&c=24&j=1.6&v=N&k=N&bw=412&bh=823&AQE=1wileypublishing.112.2o7.net/b/ss/wi... https://wileypublishing.112.2o7.net/b/ss/wileyclibhighwire/1/JS-2.27.0-LGPQ/s621859722727?AQB=1&pccr=true&ndh=1&pf=1&t=22%2F3%2F2026%2020%3A6%3A3%203%200&ce=UTF-8&pageName=Cochrane%20reviews%20%7C%20Cochrane%20Library&g=https%3A%2F%2Fwww.cochranelibrary.com%2F&c.&getValOnce=3.0.1&apl=4.0&inList=3.0&.c&cc=USD&ch=Marketing&c1=Marketing&c2=Home%20Page&c3=Cochrane%20reviews&c4=en&v12=D%3Dc61&c13=D%3Dv3&c16=D%3Dc15&c52=None&c61=EAL00000158868&c62=D%3Dc61&c63=None&c64=None&c65=Guest&s=412x823&c=24&j=1.6&v=N&k=N&bw=412&bh=823&AQE=1 — 200 — 137 B — 28 ms — h2https://www.cochranelibrary.com/cochrane-theme/images/favicon.icowww.cochranelibrary.com/cochrane-th... https://www.cochranelibrary.com/cochrane-theme/images/favicon.ico — 200 — 1.3 KiB — 37 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 4150ms · 731KB · $55/mo
www.cochranelibrary.com
Other
Costly
Execution 1000ms
Transfer 20 KB
Monthly Cost $13/mo
cmp.osano.com
Other
Costly
Execution 884ms
Transfer 64 KB
Unused 35%
Monthly Cost $12/mo
Unattributable
Other
Costly
Execution 682ms
Transfer 0 KB
Monthly Cost $9/mo
www.cochranelibrary.com
Other
Costly
Execution 530ms
Transfer 178 KB
Unused 65%
Monthly Cost $7/mo
assets.adobedtm.com
Other
Costly
Execution 248ms
Transfer 60 KB
Unused 42%
Monthly Cost $3/mo
www.cochranelibrary.com
Other
Costly
Execution 235ms
Transfer 0 KB
Monthly Cost $3/mo
www.cochranelibrary.com
Other
Optional
Execution 163ms
Transfer 122 KB
Unused 55%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 149ms
Transfer 145 KB
Unused 48%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 103ms
Transfer 125 KB
Unused 51%
Monthly Cost $1/mo
injections.readcube.com
Other
Optional
Execution 78ms
Transfer 15 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 76ms
Transfer 2 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.cochranelibrary.com adds 1000ms and costs ~$13/month
  • cmp.osano.com adds 884ms and costs ~$12/month
  • Unattributable adds 682ms and costs ~$9/month
  • www.cochranelibrary.com adds 530ms and costs ~$7/month
  • assets.adobedtm.com adds 248ms and costs ~$3/month
  • www.cochranelibrary.com adds 235ms 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.cochranelibrary.com takes 1000ms 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

cmp.osano.com takes 884ms 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 682ms 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.cochranelibrary.com takes 530ms 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

65% of www.cochranelibrary.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

assets.adobedtm.com takes 248ms 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.cochranelibrary.com takes 235ms 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

55% of www.cochranelibrary.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

51% of Google Tag Manager'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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