Skip to content
https://mendeley.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
53
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.
96
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.

4.73 s

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

49.46 s

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

132 ms

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

0.143

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

6.61 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.

49.61 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
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
13.5 MB transferred, 51 requests
FIX
13.5 MB transferred, 51 requests
Critical::
Page weighs 15.7 MB (13.5 MB transferred)
Warning::
Images are 12.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 12.7 MB
Warning::
JavaScript is 574 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 574 KB
Info::
51 HTTP requests
Info::
Estimated 2.8 g CO2 per page load
13.5 MB / 2.4 MB budget
13.5 MB transferred
51 requests
2.8 g CO2 per page load
Images 12.7 MiB 95%
JavaScript 573.7 KiB 4%
CSS 68.1 KiB 0%
Fonts 48.1 KiB 0%
Other 47.2 KiB 0%
HTML 6.0 KiB 0%
Other 3.1 KiB 0%
Other 2.9 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (13.5 MiB of 13.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2254ms total JS execution
FIX
2254ms total JS execution
Warning::
Unattributable: 1081ms CPU time
Warning::
https://www.mendeley.com/: 330ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202505.2...: 287ms CPU time
Warning::
https://assets.adobedtm.com/4a848ae9611a/aa520520f...: 283ms CPU time
Warning::
https://static.mendeley.com/md-stitch/releases/liv...: 273ms CPU time
Warning::
Third-party scripts: 2254ms (100% of total)

Main Thread Breakdown

Other 44% Script Evaluation 35% Style & Layout 9% Script Parsing & Compilation 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable1081ms217ms0ms3rd
https://www.mendeley.com/330ms11ms9ms3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js287ms166ms68ms3rd
https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.js283ms215ms64ms3rd
https://static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.js273ms146ms4ms3rd
D
Page Weight Inventory
Action
51 resources · 13.5 MB · 134 KB savings available
FIX
51 resources · 13.5 MB · 134 KB savings available
Warning::
Page weight 12.5 MB over 1MB target
Got: 13.5 MB Expected: ≤ 1 MB
Info::
~134 KB of savings available
Warning::
50 third-party resources (100% of weight)
Info::
6 resources over 200KB
51 resources · 13.5 MiB · 50 third-party 12.5 MiB over 1MB target
Image 95% · 12.8 MiB
JavaScript 4% · 573.7 KiB
CSS 1% · 72.5 KiB
Font 0% · 48.1 KiB
Other 0% · 42.5 KiB
Document 0% · 8.9 KiB

~133.6 KiB of savings available

Remove unused JavaScript: 133.6 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
Image Optimization
Action
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://static.mendeley.com/md-stitch/releases/liv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.mendeley.com/md-stitch/releases/liv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.mendeley.com/md-stitch/releases/liv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.mendeley.com/md-stitch/releases/liv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.mendeley.com/md-stitch/releases/liv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.mendeley.com/md-stitch/releases/liv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.mendeley.com/md-stitch/releases/liv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.mendeley.com/md-stitch/releases/liv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 12.7 MB
0 oversized -0 KB
11 legacy format
8 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

B
JS Bundles
15 scripts, 134 KB unused
REVIEW
15 scripts, 134 KB unused
Warning::
https://cdn.cookielaw.org/scripttemplates/202505.2...: 62 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/4a848ae9611a/aa520520f...: 51 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.mendeley.com/md-stitch/releases/liv...: 20 KB unused (7%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 134 KB
134 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js119 KB62 KB (52%)✓3rd
https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.js107 KB51 KB (48%)✓3rd
https://static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.js292 KB20 KB (7%)✓3rd
https://static.mendeley.com/md-stitch/releases/live/analytics.b064a903.js1 KB—✓3rd
https://static.mendeley.com/md-stitch/releases/live/common.body-footer.d671cdd8.js6 KB—✓3rd
https://static.mendeley.com/md-stitch/releases/live/analytics.ac8ee480.js2 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c12417176891760157 KB—✓3rd
https://static.mendeley.com/md-stitch/releases/live/common.body-header.b3ec738d.js10 KB—✓3rd
https://static.mendeley.com/lib-js-analytics/live/common-analytics.js2 KB—✓3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js13 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

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
1 fonts (48 KB)
PASS
1 fonts (48 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

48 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s FCP 4.7 s LCP 49.5 shttps://static.mendeley.com/md-stitch/releases/live/NexusSansWebPro.c20f87ed.woffNexusSansWebPro.c20f87e... https://static.mendeley.com/md-stitch/releases/live/NexusSansWebPro.c20f87ed.woff — 48.1 KiB — 18 ms — font-display: swap
NexusSansWebPro.c20f87e... woff swap
Size 48 KB
Load time 18 ms
Start 687 ms
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 ~14 KB and ~28 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
Network Waterfall
51 requests over 1915ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s FCP 4.7 s LCP 49.5 shttps://mendeley.com// https://mendeley.com/ — 301 — 239 B — 108 ms — h2https://www.mendeley.com/www.mendeley.com/ https://www.mendeley.com/ — 200 — 6.0 KiB — 211 ms — h2https://static.mendeley.com/md-stitch/releases/live/404.body.c71cd879.cssstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/404.body.c71cd879.css — 200 — 829 B — 125 ms — h2https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015 — 200 — 6.9 KiB — 26 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-header.b86865fe.cssstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-header.b86865fe.css — 200 — 3.1 KiB — 121 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-footer.c58113aa.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-footer.c58113aa.js — 200 — 4.2 KiB — 127 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-header.b3ec738d.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-header.b3ec738d.js — 200 — 9.5 KiB — 123 ms — h2https://static.mendeley.com/md-stitch/releases/live/dist-homepage.a5a6aeee.cssstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/dist-homepage.a5a6aeee.css — 200 — 63.0 KiB — 138 ms — h2https://static.mendeley.com/md-stitch/releases/live/homepage-promotional-banner.jpgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/homepage-promotional-banner.jpg — 200 — 8.0 MiB — 874 ms — h2https://static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.js — 200 — 292.1 KiB — 166 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-footer.d671cdd8.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-footer.d671cdd8.js — 200 — 5.5 KiB — 126 ms — h2https://static.mendeley.com/md-stitch/releases/live/analytics.ac8ee480.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/analytics.ac8ee480.js — 200 — 1.6 KiB — 127 ms — h2https://static.mendeley.com/md-stitch/releases/live/analytics.b064a903.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/analytics.b064a903.js — 200 — 1017 B — 122 ms — h2https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.jsassets.adobedtm.com/4a848ae9611a/aa... https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.js — 200 — 106.6 KiB — 22 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-footer.a8cb156b.cssstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-footer.a8cb156b.css — 200 — 1.1 KiB — 57 ms — h2https://static.mendeley.com/md-stitch/releases/live/up-right.b47d952b.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/up-right.b47d952b.svg — 200 — 487 B — 60 ms — h2https://static.mendeley.com/md-stitch/releases/live/elsevier-white.2f34663f.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/elsevier-white.2f34663f.svg — 200 — 16.4 KiB — 58 ms — h2https://static.mendeley.com/md-stitch/releases/live/relx.dda10e01.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/relx.dda10e01.svg — 200 — 952 B — 58 ms — h2https://static.mendeley.com/lib-js-analytics/live/common-analytics.jsstatic.mendeley.com/lib-js-analytic... https://static.mendeley.com/lib-js-analytics/live/common-analytics.js — 200 — 1.7 KiB — 59 ms — h2https://static.mendeley.com/md-stitch/releases/live/logo-full-white.a836c780.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/logo-full-white.a836c780.svg — 200 — 2.7 KiB — 45 ms — h2https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js — 200 — 13.0 KiB — 18 ms — h2https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.js — 200 — 1.8 KiB — 16 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 32 ms — h2https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/a63fb5b7b322/RCeda49fd1eb0d4b9b97ab4ab10327bff9-source.min.jsassets.adobedtm.com/4a848ae9611a/aa... https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/a63fb5b7b322/RCeda49fd1eb0d4b9b97ab4ab10327bff9-source.min.js — 200 — 655 B — 4 ms — h2https://static.mendeley.com/md-stitch/releases/live/background.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/background.svg — 200 — 13.8 KiB — 53 ms — h2https://static.mendeley.com/md-stitch/releases/live/NexusSansWebPro.c20f87ed.woffstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/NexusSansWebPro.c20f87ed.woff — 200 — 48.1 KiB — 18 ms — h2data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 53 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 53 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 53 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 53 ms — data
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s FCP 4.7 s LCP 49.5 shttps://mendeley.com// https://mendeley.com/ — 301 — 239 B — 108 ms — h2https://www.mendeley.com/www.mendeley.com/ https://www.mendeley.com/ — 200 — 6.0 KiB — 211 ms — h2https://static.mendeley.com/md-stitch/releases/live/404.body.c71cd879.cssstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/404.body.c71cd879.css — 200 — 829 B — 125 ms — h2https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015 — 200 — 6.9 KiB — 26 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-header.b86865fe.cssstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-header.b86865fe.css — 200 — 3.1 KiB — 121 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-footer.c58113aa.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-footer.c58113aa.js — 200 — 4.2 KiB — 127 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-header.b3ec738d.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-header.b3ec738d.js — 200 — 9.5 KiB — 123 ms — h2https://static.mendeley.com/md-stitch/releases/live/dist-homepage.a5a6aeee.cssstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/dist-homepage.a5a6aeee.css — 200 — 63.0 KiB — 138 ms — h2https://static.mendeley.com/md-stitch/releases/live/homepage-promotional-banner.jpgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/homepage-promotional-banner.jpg — 200 — 8.0 MiB — 874 ms — h2https://static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.js — 200 — 292.1 KiB — 166 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-footer.d671cdd8.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-footer.d671cdd8.js — 200 — 5.5 KiB — 126 ms — h2https://static.mendeley.com/md-stitch/releases/live/analytics.ac8ee480.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/analytics.ac8ee480.js — 200 — 1.6 KiB — 127 ms — h2https://static.mendeley.com/md-stitch/releases/live/analytics.b064a903.jsstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/analytics.b064a903.js — 200 — 1017 B — 122 ms — h2https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.jsassets.adobedtm.com/4a848ae9611a/aa... https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.js — 200 — 106.6 KiB — 22 ms — h2https://static.mendeley.com/md-stitch/releases/live/common.body-footer.a8cb156b.cssstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/common.body-footer.a8cb156b.css — 200 — 1.1 KiB — 57 ms — h2https://static.mendeley.com/md-stitch/releases/live/up-right.b47d952b.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/up-right.b47d952b.svg — 200 — 487 B — 60 ms — h2https://static.mendeley.com/md-stitch/releases/live/elsevier-white.2f34663f.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/elsevier-white.2f34663f.svg — 200 — 16.4 KiB — 58 ms — h2https://static.mendeley.com/md-stitch/releases/live/relx.dda10e01.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/relx.dda10e01.svg — 200 — 952 B — 58 ms — h2https://static.mendeley.com/lib-js-analytics/live/common-analytics.jsstatic.mendeley.com/lib-js-analytic... https://static.mendeley.com/lib-js-analytics/live/common-analytics.js — 200 — 1.7 KiB — 59 ms — h2https://static.mendeley.com/md-stitch/releases/live/logo-full-white.a836c780.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/logo-full-white.a836c780.svg — 200 — 2.7 KiB — 45 ms — h2https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js — 200 — 13.0 KiB — 18 ms — h2https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.js — 200 — 1.8 KiB — 16 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 32 ms — h2https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/a63fb5b7b322/RCeda49fd1eb0d4b9b97ab4ab10327bff9-source.min.jsassets.adobedtm.com/4a848ae9611a/aa... https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/a63fb5b7b322/RCeda49fd1eb0d4b9b97ab4ab10327bff9-source.min.js — 200 — 655 B — 4 ms — h2https://static.mendeley.com/md-stitch/releases/live/background.svgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/background.svg — 200 — 13.8 KiB — 53 ms — h2https://static.mendeley.com/md-stitch/releases/live/NexusSansWebPro.c20f87ed.woffstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/NexusSansWebPro.c20f87ed.woff — 200 — 48.1 KiB — 18 ms — h2data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 53 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 53 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 53 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 53 ms — datahttps://www.mendeley.com/undefinedwww.mendeley.com/undefined https://www.mendeley.com/undefined — 404 — 2.9 KiB — 212 ms — h2data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200… — 200 — 132 B — 3 ms — datahttps://cdn.cookielaw.org/consent/bfc52c48-f7c5-45a4-a7e0-e44db83eeff9/bfc52c48-f7c5-45a4-a7e0-e44db83eeff9.jsoncdn.cookielaw.org/consent/bfc52c48-... https://cdn.cookielaw.org/consent/bfc52c48-f7c5-45a4-a7e0-e44db83eeff9/bfc52c48-f7c5-45a4-a7e0-e44db83eeff9.json — 200 — 2.5 KiB — 46 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 295 B — 35 ms — h2https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js — 200 — 119.2 KiB — 37 ms — h2https://cdn.cookielaw.org/consent/bfc52c48-f7c5-45a4-a7e0-e44db83eeff9/019b9d15-6a96-773e-8811-21951a76425c/en.jsoncdn.cookielaw.org/consent/bfc52c48-... https://cdn.cookielaw.org/consent/bfc52c48-f7c5-45a4-a7e0-e44db83eeff9/019b9d15-6a96-773e-8811-21951a76425c/en.json — 200 — 23.0 KiB — 31 ms — h2https://cdn.cookielaw.org/scripttemplates/202505.2.0/assets/otFlat.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202505.2.0/assets/otFlat.json — 200 — 3.4 KiB — 22 ms — h2https://cdn.cookielaw.org/scripttemplates/202505.2.0/assets/v2/otPcCenter.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202505.2.0/assets/v2/otPcCenter.json — 200 — 13.0 KiB — 25 ms — h2https://cdn.cookielaw.org/scripttemplates/202505.2.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202505.2.0/assets/otCommonStyles.css — 200 — 4.5 KiB — 24 ms — h2https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/a63fb5b7b322/RCeb12d4e491b043b5b58f643beef73ef4-source.min.jsassets.adobedtm.com/4a848ae9611a/aa... https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/a63fb5b7b322/RCeb12d4e491b043b5b58f643beef73ef4-source.min.js — 200 — 837 B — 11 ms — h2https://cdn.cookielaw.org/logos/static/ot_guard_logo.svgcdn.cookielaw.org/logos/static/ot_g... https://cdn.cookielaw.org/logos/static/ot_guard_logo.svg — 200 — 506 B — 16 ms — h2https://cdn.cookielaw.org/logos/static/ot_company_logo.pngcdn.cookielaw.org/logos/static/ot_c... https://cdn.cookielaw.org/logos/static/ot_company_logo.png — 200 — 19.1 KiB — 21 ms — h2https://cdn.cookielaw.org/logos/static/powered_by_logo.svgcdn.cookielaw.org/logos/static/powe... https://cdn.cookielaw.org/logos/static/powered_by_logo.svg — 200 — 2.6 KiB — 16 ms — h2https://www.mendeley.com/cdn-cgi/rum?www.mendeley.com/cdn-cgi/rum? https://www.mendeley.com/cdn-cgi/rum? — 204 — 183 B — 10 ms — h2https://static.mendeley.com/md-stitch/releases/live/favicon.57072409.icostatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/favicon.57072409.ico — 200 — 2.2 KiB — 18 ms — h2https://static.mendeley.com/md-stitch/releases/live/hero-banner.avifstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/hero-banner.avif — 200 — 392.1 KiB — 152 ms — h2https://static.mendeley.com/md-stitch/releases/live/ask-my-library.avifstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/ask-my-library.avif — 200 — 104.9 KiB — 70 ms — h2https://static.mendeley.com/md-stitch/releases/live/mendeley-mrm.avifstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/mendeley-mrm.avif — 200 — 176.1 KiB — 99 ms — h2https://static.mendeley.com/md-stitch/releases/live/blog-img-3.jpgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/blog-img-3.jpg — 200 — 1009.9 KiB — 428 ms — h2https://static.mendeley.com/md-stitch/releases/live/blog-img-2.jpgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/blog-img-2.jpg — 200 — 1.0 MiB — 229 ms — h2https://static.mendeley.com/md-stitch/releases/live/blog-img-1.jpgstatic.mendeley.com/md-stitch/relea... https://static.mendeley.com/md-stitch/releases/live/blog-img-1.jpg — 200 — 2.1 MiB — 383 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 2254ms · 524KB · $30/mo
Unattributable
Other
Costly
Execution 1081ms
Transfer 0 KB
Monthly Cost $14/mo
www.mendeley.com
Other
Costly
Execution 330ms
Transfer 6 KB
Monthly Cost $4/mo
OneTrust
Consent
Essential
Execution 287ms
Transfer 119 KB
Unused 52%
Monthly Cost $4/mo
assets.adobedtm.com
Other
Costly
Execution 283ms
Transfer 107 KB
Unused 48%
Monthly Cost $4/mo
static.mendeley.com
Other
Costly
Execution 273ms
Transfer 292 KB
Unused 7%
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • Unattributable adds 1081ms and costs ~$14/month
  • www.mendeley.com adds 330ms and costs ~$4/month
  • assets.adobedtm.com adds 283ms and costs ~$4/month
  • static.mendeley.com adds 273ms and costs ~$4/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

Unattributable takes 1081ms 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.mendeley.com takes 330ms 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 OneTrust'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 283ms 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

static.mendeley.com takes 273ms 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

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.

Send Feedback