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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
66
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.
77
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.

1.33 s

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

2.03 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.

0.348

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

2.12 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.

2.03 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
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
D
JS Bundles
Action
56 scripts, 362 KB unused
FIX
56 scripts, 362 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...: 68 KB unused (56%)
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: 362 KB
362 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 KB68 KB (56%)✓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://script.crazyegg.com/pages/scripts/0056/6375.js3 KB—✓3rd
https://www.cochranelibrary.com/html/js/liferay/available_languages.jsp?browserId=other&themeId=cochrane_WAR_cochranetheme&colorSchemeId=01&minifierType=js&languageId=en_US&b=6210&t=15599164340001 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
blob:https://www.cochranelibrary.com/ca895970-1464-4384-8ea5-6cf9d593cb3d-0 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
121 resources · 1.9 MB · 362 KB savings available
FIX
121 resources · 1.9 MB · 362 KB savings available
Warning::
Page weight 879 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~362 KB of savings available
Warning::
120 third-party resources (100% of weight)
121 resources · 1.9 MiB · 120 third-party 879.1 KiB over 1MB target
JavaScript 48% · 914.1 KiB
Image 36% · 689.7 KiB
Font 8% · 150.6 KiB
CSS 6% · 119.6 KiB
Document 1% · 22.0 KiB
Other 0% · 7.0 KiB

~361.6 KiB of savings available

Remove unused JavaScript: 361.6 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
1.9 MB transferred, 121 requests
REVIEW
1.9 MB transferred, 121 requests
Info::
Page weighs 4.6 MB (1.9 MB transferred)
Warning::
JavaScript is 914 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 914 KB
Warning::
121 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
121 requests
0.39 g CO2 per page load
JavaScript 914.1 KiB 48%
Images 688.3 KiB 36%
Fonts 150.6 KiB 8%
CSS 119.6 KiB 6%
HTML 21.6 KiB 1%
Other 5.8 KiB 0%
Other 3.1 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
31 images, 0 KB saveable
REVIEW
31 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/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/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/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/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/image/journal/arti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31 images 688 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

B
JS Execution Cost
965ms total JS execution
REVIEW
965ms total JS execution
Warning::
https://www.cochranelibrary.com/: 284ms CPU time
Info::
https://cmp.osano.com/AzZdRbSORDOOzF9W/d594efc1-96...: 234ms CPU time
Info::
https://www.cochranelibrary.com/cochrane-theme/js/...: 160ms CPU time
Info::
Unattributable: 158ms CPU time
Info::
https://www.cochranelibrary.com/cdn-cgi/challenge-...: 66ms CPU time
Warning::
Third-party scripts: 965ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 19% Style & Layout 13% Script Parsing & Compilation 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.cochranelibrary.com/284ms32ms4ms3rd
https://cmp.osano.com/AzZdRbSORDOOzF9W/d594efc1-9663-477d-9528-6576640e64fd/osano.js234ms191ms10ms3rd
https://www.cochranelibrary.com/cochrane-theme/js/theme.js?t=1776315578000160ms120ms21ms3rd
Unattributable158ms20ms0ms3rd
https://www.cochranelibrary.com/cdn-cgi/challenge-platform/scripts/jsd/main.js66ms56ms1ms3rd
https://assets.adobedtm.com/59640f9fa510/7cad07cf7779/launch-a215d9c51521.min.js62ms53ms7ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.0 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-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2 — 14.6 KiB — 35 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 — 66 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 — 51 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 — 61 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 30 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 35 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 unknown swap
Size 70 KB
Load time 66 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 51 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
fontawesome-alloy.woff woff swap
Size 37 KB
Load time 61 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+
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
121 requests over 2658ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.0 shttps://cochranelibrary.com// https://cochranelibrary.com/ — 301 — 466 B — 194 ms — h2https://www.cochranelibrary.com/www.cochranelibrary.com/ https://www.cochranelibrary.com/ — 302 — 208 B — 420 ms — h2https://www.cochranelibrary.com/?cookiesEnabledwww.cochranelibrary.com/?cookiesEna... https://www.cochranelibrary.com/?cookiesEnabled — 302 — 154 B — 257 ms — h2https://www.cochranelibrary.com/www.cochranelibrary.com/ https://www.cochranelibrary.com/ — 200 — 20.2 KiB — 266 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 — 63 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 — 83 ms — https://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 — 101 ms — h2https://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 — 72 ms — h3https://static.addtoany.com/menu/page.jsstatic.addtoany.com/menu/page.js https://static.addtoany.com/menu/page.js — 200 — 2.2 KiB — 70 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 — 158 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 — 20.2 KiB — 95 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 — 200 — 473 B — 61 ms — h2https://www.cochranelibrary.com/html/portlet/login/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/login/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315690000 — 200 — 495 B — 54 ms — h2https://www.cochranelibrary.com/scolaris-content-display/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315622000www.cochranelibrary.com/scolaris-co... https://www.cochranelibrary.com/scolaris-content-display/css/main.css?browserId=other&themeId=cochrane_WAR_cochranetheme&minifierType=css&languageId=en_US&b=6210&t=1776315622000 — 200 — 239 B — 52 ms — 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h2https://injections.readcube.com/html/track_epdf.1af9d505.html?action=Link&publisher=cochrane&status=OKinjections.readcube.com/html/track_... https://injections.readcube.com/html/track_epdf.1af9d505.html?action=Link&publisher=cochrane&status=OK — 200 — 436 B — 77 ms — h3https://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 — 36 ms — h3https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 84 ms — h2https://wileypublishing.112.2o7.net/b/ss/wileyclibhighwire/1/JS-2.27.0-LGPQ/s68844527057328?AQB=1&ndh=1&pf=1&t=22%2F3%2F2026%2020%3A6%3A20%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=800x600&c=24&j=1.6&v=N&k=N&bw=1350&bh=940&AQE=1wileypublishing.112.2o7.net/b/ss/wi... https://wileypublishing.112.2o7.net/b/ss/wileyclibhighwire/1/JS-2.27.0-LGPQ/s68844527057328?AQB=1&ndh=1&pf=1&t=22%2F3%2F2026%2020%3A6%3A20%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=800x600&c=24&j=1.6&v=N&k=N&bw=1350&bh=940&AQE=1 — 302 — 782 B — 59 ms — h2https://wileypublishing.112.2o7.net/b/ss/wileyclibhighwire/1/JS-2.27.0-LGPQ/s68844527057328?AQB=1&pccr=true&ndh=1&pf=1&t=22%2F3%2F2026%2020%3A6%3A20%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=800x600&c=24&j=1.6&v=N&k=N&bw=1350&bh=940&AQE=1wileypublishing.112.2o7.net/b/ss/wi... https://wileypublishing.112.2o7.net/b/ss/wileyclibhighwire/1/JS-2.27.0-LGPQ/s68844527057328?AQB=1&pccr=true&ndh=1&pf=1&t=22%2F3%2F2026%2020%3A6%3A20%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=800x600&c=24&j=1.6&v=N&k=N&bw=1350&bh=940&AQE=1 — 200 — 138 B — 22 ms — h2https://www.cochranelibrary.com/cochrane-theme/images/favicon.icowww.cochranelibrary.com/cochrane-th... https://www.cochranelibrary.com/cochrane-theme/images/favicon.ico — 200 — 1.4 KiB — 38 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 965ms · 323KB · $13/mo
www.cochranelibrary.com
Other
Costly
Execution 284ms
Transfer 20 KB
Monthly Cost $4/mo
cmp.osano.com
Other
Costly
Execution 234ms
Transfer 64 KB
Unused 35%
Monthly Cost $3/mo
www.cochranelibrary.com
Other
Optional
Execution 160ms
Transfer 178 KB
Unused 65%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 158ms
Transfer 0 KB
Monthly Cost $2/mo
www.cochranelibrary.com
Other
Optional
Execution 66ms
Transfer 0 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 62ms
Transfer 60 KB
Unused 42%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.cochranelibrary.com adds 284ms and costs ~$4/month
  • cmp.osano.com adds 234ms 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 284ms 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 234ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

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

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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