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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
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.

1.18 s

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

1.20 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.

0.248

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

1.89 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.

1.20 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
5 PASS 4 REVIEW 4 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 573.6 KiB 4%
CSS 68.1 KiB 0%
Fonts 48.1 KiB 0%
Other 47.2 KiB 0%
HTML 6.0 KiB 0%
Other 3.6 KiB 0%
Other 3.0 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
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% · 573.6 KiB
CSS 1% · 72.5 KiB
Font 0% · 48.1 KiB
Other 0% · 42.5 KiB
Document 0% · 8.9 KiB

~134.0 KiB of savings available

Remove unused JavaScript: 134.0 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 Execution Cost
760ms total JS execution
REVIEW
760ms total JS execution
Warning::
Unattributable: 294ms CPU time
Warning::
https://www.mendeley.com/: 269ms CPU time
Info::
https://assets.adobedtm.com/4a848ae9611a/aa520520f...: 71ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202505.2...: 67ms CPU time
Info::
https://static.mendeley.com/md-stitch/releases/liv...: 59ms CPU time
Warning::
Third-party scripts: 760ms (100% of total)

Main Thread Breakdown

Other 50% Script Evaluation 30% Style & Layout 10% Script Parsing & Compilation 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable294ms66ms0ms3rd
https://www.mendeley.com/269ms4ms1ms3rd
https://assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.js71ms53ms16ms3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js67ms41ms17ms3rd
https://static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.js59ms47ms1ms3rd
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...: 21 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 KB21 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.js1 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c12417176891760157 KB—✓3rd
https://static.mendeley.com/md-stitch/releases/live/common.body-header.b3ec738d.js9 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 500 ms 1.0 s FCP 1.2 s LCP 1.2 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 — 41 ms — font-display: swap
NexusSansWebPro.c20f87e... woff swap
Size 48 KB
Load time 41 ms
Start 897 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
Network Waterfall
51 requests over 1839ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.2 shttps://mendeley.com// https://mendeley.com/ — 301 — 239 B — 110 ms — h2https://www.mendeley.com/www.mendeley.com/ https://www.mendeley.com/ — 200 — 6.0 KiB — 231 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 — 981 B — 223 ms — h2https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015 — 200 — 6.9 KiB — 35 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 — 3.0 KiB — 254 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 — 4.3 KiB — 233 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 — 9.3 KiB — 232 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 — 252 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 — 1.4 s — 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 — 292.2 KiB — 286 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 — 228 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 — 1.4 KiB — 226 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 — 1.2 KiB — 224 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 — 18 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 — 68 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 — 411 B — 68 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 — 68 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 — 1.0 KiB — 69 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 — 1.6 KiB — 68 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 — 38 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 — 161 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 — 105.0 KiB — 83 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 — 176.2 KiB — 107 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 — 549 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 — 285 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 — 420 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 — 48 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 — 6 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 — 8 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 35 ms — h2
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.2 shttps://mendeley.com// https://mendeley.com/ — 301 — 239 B — 110 ms — h2https://www.mendeley.com/www.mendeley.com/ https://www.mendeley.com/ — 200 — 6.0 KiB — 231 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 — 981 B — 223 ms — h2https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015 — 200 — 6.9 KiB — 35 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 — 3.0 KiB — 254 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 — 4.3 KiB — 233 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 — 9.3 KiB — 232 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 — 252 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 — 1.4 s — 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 — 292.2 KiB — 286 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 — 228 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 — 1.4 KiB — 226 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 — 1.2 KiB — 224 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 — 18 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 — 68 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 — 411 B — 68 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 — 68 ms — 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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 760ms · 524KB · $10/mo
Unattributable
Other
Costly
Execution 294ms
Transfer 0 KB
Monthly Cost $4/mo
www.mendeley.com
Other
Costly
Execution 269ms
Transfer 6 KB
Monthly Cost $4/mo
assets.adobedtm.com
Other
Optional
Execution 71ms
Transfer 107 KB
Unused 48%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 67ms
Transfer 119 KB
Unused 52%
Monthly Cost $1/mo
static.mendeley.com
Other
Optional
Execution 59ms
Transfer 292 KB
Unused 7%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 294ms and costs ~$4/month
  • www.mendeley.com adds 269ms 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 294ms 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 269ms 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

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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