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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
52
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
80
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.
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.

4.61 s

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

9.89 s

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

463 ms

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

0.000

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

4.61 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.

15.79 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
3.4 MB transferred, 179 requests
FIX
3.4 MB transferred, 179 requests
Warning::
Page weighs 11.4 MB (3.4 MB transferred)
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Info::
Fonts are 650 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 650 KB
Info::
CSS is 263 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 263 KB
Warning::
179 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.72 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
179 requests
0.72 g CO2 per page load
JavaScript 2.0 MiB 57%
Fonts 650.5 KiB 19%
Other 329.6 KiB 9%
CSS 263.0 KiB 8%
HTML 127.5 KiB 4%
Images 109.1 KiB 3%
Other 7.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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

D
JS Execution Cost
Action
2345ms total JS execution
FIX
2345ms total JS execution
Warning::
Unattributable: 613ms CPU time
Warning::
https://europepmc.org/: 455ms CPU time
Warning::
https://europepmc.org/js/app.a19c91e2.js: 435ms CPU time
Warning::
https://script.crazyegg.com/pages/versioned/common...: 354ms CPU time
Info::
https://script.crazyegg.com/scripts/addons/1.0.146...: 92ms CPU time
Warning::
Third-party scripts: 1200ms (51% of total)

Main Thread Breakdown

Script Evaluation 44% Other 28% Style & Layout 10% Script Parsing & Compilation 9% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
Unattributable613ms6ms0ms3rd
https://europepmc.org/455ms11ms4ms1st
https://europepmc.org/js/app.a19c91e2.js435ms356ms46ms1st
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js354ms325ms14ms3rd
https://script.crazyegg.com/scripts/addons/1.0.146/survey.js92ms55ms36ms3rd
https://europepmc.org/piwik.js77ms67ms5ms1st
https://script.crazyegg.com/scripts/addons/thirdparty/c00d2378dcf12c80724efc85b3c84902.js75ms50ms25ms3rd
https://europepmc.org/wicket/resource/org.apache.wicket.resource.JQueryResourceReference/jquery/jquery-3.6.0-ver-7B432A70897DCD6A8F6D26413CDF1916.js72ms49ms7ms1st
https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js66ms58ms7ms3rd
https://europepmc.org/plugins/jquery-ui-1.10.4.custom/js/jquery-ui-1.10.4.custom.min.js?v=1.1.156ms30ms18ms1st

Showing top 10 of 11 scripts

D
JS Bundles
Action
79 scripts, 369 KB unused
FIX
79 scripts, 369 KB unused
Warning::
https://europepmc.org/js/chunk-vendors.6544f1b1.js: 143 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.crazyegg.com/scripts/addons/1.0.146...: 74 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://europepmc.org/js/app.a19c91e2.js: 70 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://europepmc.org/plugins/jquery-ui-1.10.4.cus...: 53 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.crazyegg.com/pages/versioned/common...: 28 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 369 KB
369 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://europepmc.org/js/chunk-vendors.6544f1b1.js210 KB143 KB (69%)✓1st
https://script.crazyegg.com/scripts/addons/1.0.146/survey.js100 KB74 KB (77%)✓3rd
https://europepmc.org/js/app.a19c91e2.js141 KB70 KB (50%)✓1st
https://europepmc.org/plugins/jquery-ui-1.10.4.custom/js/jquery-ui-1.10.4.custom.min.js?v=1.1.159 KB53 KB (90%)✓1st
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB28 KB (51%)✓3rd
https://europepmc.org/js/chunk-377d1f58.a9bfdc4d.js25 KB—✓1st
https://europepmc.org/js/chunk-675cc948.428f3075.js2 KB—✓1st
https://europepmc.org/template/yahoo-min.js?v=1.1.12 KB—✓1st
https://europepmc.org/template/dom-min.js?v=1.1.13 KB—✓1st
https://europepmc.org/template/enrichment.js?v=1.1.13 KB—✓1st

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
179 resources · 3.4 MB · 369 KB savings available
FIX
179 resources · 3.4 MB · 369 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~369 KB of savings available
Warning::
44 third-party resources (53% of weight)
Info::
3 resources over 200KB
179 resources · 3.4 MiB · 44 third-party 2.4 MiB over 1MB target
JavaScript 65% · 2.2 MiB
Font 19% · 650.5 KiB
CSS 10% · 336.9 KiB
Document 4% · 127.6 KiB
Image 3% · 109.6 KiB
Other 0% · 7.3 KiB

~368.5 KiB of savings available

Remove unused JavaScript: 368.5 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, max-age=0, must-revalidate, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, max-age=0, must-revalidate, no-store

DirectiveValueMeaning
no-cache—Cache but always revalidate first
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
no-store—Never cache this response
B
Third-Party Impact
53% third-party, 0 ms blocking
REVIEW
53% third-party, 0 ms blocking
Warning::
Third-party code accounts for 53% of page weight (1.8 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
47%
53%
First-party Third-party
C
Image Optimization
Action
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://europepmc.org/img/trusted-partnerships.a5a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEkA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGwA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://europepmc.org/img/innovative-features.b45d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://europepmc.org/img/comprehensive-search.0e8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://europepmc.org/img/gbc-footer.86def661.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 109 KB
0 oversized -0 KB
11 legacy format
6 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

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
7 fonts (650 KB)
PASS
7 fonts (650 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

650 KB total

Render-blocking

0

of 7

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 FCP 4.6 s LCP 9.9 shttps://europepmc.org/fonts/fa-solid-900.1ec0ba05.woff2fa-solid-900.1ec0ba05.w... https://europepmc.org/fonts/fa-solid-900.1ec0ba05.woff2 — 153.2 KiB — 183 ms — font-display: swaphttps://europepmc.org/fonts/OpenSans-Regular.629a55a7.ttfOpenSans-Regular.629a55... https://europepmc.org/fonts/OpenSans-Regular.629a55a7.ttf — 114.1 KiB — 198 ms — font-display: swaphttps://europepmc.org/fonts/OpenSans-Semibold.33f225b8.ttfOpenSans-Semibold.33f22... https://europepmc.org/fonts/OpenSans-Semibold.33f225b8.ttf — 116.8 KiB — 193 ms — font-display: swaphttps://europepmc.org/fonts/OpenSans-Bold.50145685.ttfOpenSans-Bold.50145685.ttf https://europepmc.org/fonts/OpenSans-Bold.50145685.ttf — 117.1 KiB — 147 ms — font-display: swaphttps://europepmc.org/fonts/fa-brands-400.b55b1345.woff2fa-brands-400.b55b1345.... https://europepmc.org/fonts/fa-brands-400.b55b1345.woff2 — 115.4 KiB — 138 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 91 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 75 ms — font-display: swap
fa-solid-900.1ec0ba05.w... woff2 swap
Size 153 KB
Load time 183 ms
Start 470 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
OpenSans-Regular.629a55... ttf swap
Size 114 KB
Load time 198 ms
Start 470 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
OpenSans-Semibold.33f22... ttf swap
Size 117 KB
Load time 193 ms
Start 470 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
OpenSans-Bold.50145685.ttf ttf swap
Size 117 KB
Load time 147 ms
Start 523 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.b55b1345.... woff2 swap
Size 115 KB
Load time 138 ms
Start 523 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 91 ms
Start 840 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 75 ms
Start 858 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~413 KB and ~826 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
89 hints, 0 missing preconnects
PASS
89 hints, 0 missing preconnects
Info::
Page uses 89 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
+75
85

89 resource hints configured

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
179 requests over 4305ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.6 s LCP 9.9 shttps://europepmc.org// https://europepmc.org/ — 200 — 17.2 KiB — 170 ms — h2https://europepmc.org/wicket/resource/org.apache.wicket.resource.JQueryResourceReference/jquery/jquery-3.6.0-ver-7B432A70897DCD6A8F6D26413CDF1916.js/wicket/resource/org.apache.wicket.... https://europepmc.org/wicket/resource/org.apache.wicket.resource.JQueryResourceReference/jquery/jquery-3.6.0-ver-7B432A70897DCD6A8F6D26413CDF1916.js — 200 — 30.3 KiB — 87 ms — h2https://europepmc.org/css_min/min/orcid-min.css?v=1.1.1/css_min/min/orcid-min.css?v=1.1.1 https://europepmc.org/css_min/min/orcid-min.css?v=1.1.1 — 200 — 2.3 KiB — 169 ms — h2https://europepmc.org/wicket/resource/org.europepmc.account.AccountSigninPanel/AccoutSigninPanel-ver-23536C62407C81CFCDCB80EBF689D4C9.js/wicket/resource/org.europepmc.acco... https://europepmc.org/wicket/resource/org.europepmc.account.AccountSigninPanel/AccoutSigninPanel-ver-23536C62407C81CFCDCB80EBF689D4C9.js — 200 — 938 B — 57 ms — h2https://europepmc.org/template/font-awesome/css/all.min.css/template/font-awesome/css/all.min.... https://europepmc.org/template/font-awesome/css/all.min.css — 200 — 10.5 KiB — 68 ms — h2https://europepmc.org/template/EPMC-iconfont/style.css?v=1.1.1/template/EPMC-iconfont/style.css?v... https://europepmc.org/template/EPMC-iconfont/style.css?v=1.1.1 — 200 — 503 B — 150 ms — h2https://europepmc.org/template/jquery_ui.css?v=1.1.1/template/jquery_ui.css?v=1.1.1 https://europepmc.org/template/jquery_ui.css?v=1.1.1 — 200 — 1.4 KiB — 159 ms — h2https://europepmc.org/template/jquery_menu.css?v=1.1.1/template/jquery_menu.css?v=1.1.1 https://europepmc.org/template/jquery_menu.css?v=1.1.1 — 200 — 848 B — 121 ms — h2https://europepmc.org/template/yahoo-min.js?v=1.1.1/template/yahoo-min.js?v=1.1.1 https://europepmc.org/template/yahoo-min.js?v=1.1.1 — 200 — 2.5 KiB — 112 ms — h2https://europepmc.org/template/dom-min.js?v=1.1.1/template/dom-min.js?v=1.1.1 https://europepmc.org/template/dom-min.js?v=1.1.1 — 200 — 3.4 KiB — 121 ms — h2https://europepmc.org/template/enrichment.js?v=1.1.1/template/enrichment.js?v=1.1.1 https://europepmc.org/template/enrichment.js?v=1.1.1 — 200 — 3.1 KiB — 168 ms — h2https://europepmc.org/template/enrichment.css?v=1.1.1/template/enrichment.css?v=1.1.1 https://europepmc.org/template/enrichment.css?v=1.1.1 — 200 — 1.7 KiB — 97 ms — h2https://europepmc.org/template/hoverIntent.js?v=1.1.1/template/hoverIntent.js?v=1.1.1 https://europepmc.org/template/hoverIntent.js?v=1.1.1 — 200 — 1.2 KiB — 175 ms — h2https://europepmc.org/plugins/jquery-ui-1.10.4.custom/js/jquery-ui-1.10.4.custom.min.js?v=1.1.1/plugins/jquery-ui-1.10.4.custom/js... https://europepmc.org/plugins/jquery-ui-1.10.4.custom/js/jquery-ui-1.10.4.custom.min.js?v=1.1.1 — 200 — 59.4 KiB — 190 ms — h2https://europepmc.org/template/ncbi/epmc.ncbi.css?v=1.1.1/template/ncbi/epmc.ncbi.css?v=1.1.... https://europepmc.org/template/ncbi/epmc.ncbi.css?v=1.1.1 — 200 — 256 B — 100 ms — h2https://europepmc.org/template/epmc.js?v=1.1.1/template/epmc.js?v=1.1.1 https://europepmc.org/template/epmc.js?v=1.1.1 — 200 — 4.7 KiB — 177 ms — h2https://europepmc.org/template/epmc_new.css?v=1.1.1/template/epmc_new.css?v=1.1.1 https://europepmc.org/template/epmc_new.css?v=1.1.1 — 200 — 12.4 KiB — 162 ms — h2https://europepmc.org/css/compromise.css/css/compromise.css https://europepmc.org/css/compromise.css — 200 — 1.7 KiB — 84 ms — h2https://europepmc.org/epmc-scripts/polyfill-index-1.0.0.min.js/epmc-scripts/polyfill-index-1.0.0.... https://europepmc.org/epmc-scripts/polyfill-index-1.0.0.min.js — 200 — 566 B — 118 ms — h2https://europepmc.org/css/app.375f5c29.css/css/app.375f5c29.css https://europepmc.org/css/app.375f5c29.css — 200 — 15.9 KiB — 92 ms — h2https://europepmc.org/css/chunk-vendors.babd8783.css/css/chunk-vendors.babd8783.css https://europepmc.org/css/chunk-vendors.babd8783.css — 200 — 46.7 KiB — 114 ms — 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https://tracking.crazyegg.com/clock?u=1217749&st=437800&t=1776808058489&tk=05e9511dd2b9c250c39b5d9c68dc4e94 — 200 — 147 B — 63 ms — h2https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.jsscript.crazyegg.com/pages/versioned... https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js — 200 — 22.6 KiB — 25 ms — h3https://script.crazyegg.com/scripts/addons/1.0.146/index.jsscript.crazyegg.com/scripts/addons/... https://script.crazyegg.com/scripts/addons/1.0.146/index.js — 200 — 721 B — 27 ms — h3https://script.crazyegg.com/scripts/addons/thirdparty/c00d2378dcf12c80724efc85b3c84902.jsscript.crazyegg.com/scripts/addons/... https://script.crazyegg.com/scripts/addons/thirdparty/c00d2378dcf12c80724efc85b3c84902.js — 200 — 85.1 KiB — 45 ms — h3https://script.crazyegg.com/scripts/addons/1.0.146/survey.jsscript.crazyegg.com/scripts/addons/... https://script.crazyegg.com/scripts/addons/1.0.146/survey.js — 200 — 99.9 KiB — 47 ms — h3https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 113 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 494 B — 93 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb — 200 — 146.3 KiB — 71 ms — h3https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 99 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 0 B — 79 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb — 200 — 0 B — 58 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 26 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 49 ms — h3https://europepmc.org/images/favicon.ico/images/favicon.ico https://europepmc.org/images/favicon.ico — 200 — 577 B — 72 ms — h2https://i.ytimg.com/vi_webp/L9Xzn0Y0rg4/sddefault.webpi.ytimg.com/vi_webp/L9Xzn0Y0rg4/sdd... https://i.ytimg.com/vi_webp/L9Xzn0Y0rg4/sddefault.webp — 200 — 32.9 KiB — 130 ms — h2https://i.ytimg.com/vi_webp/2jyY9_hnpB8/sddefault.webpi.ytimg.com/vi_webp/2jyY9_hnpB8/sdd... https://i.ytimg.com/vi_webp/2jyY9_hnpB8/sddefault.webp — 200 — 7.6 KiB — 41 ms — h2https://www.google.com/js/th/Tsj2rE80jstpz6Q1k9XA1bynyWMKlWaB3UmUIkCsRnA.jswww.google.com/js/th/Tsj2rE80jstpz6... https://www.google.com/js/th/Tsj2rE80jstpz6Q1k9XA1bynyWMKlWaB3UmUIkCsRnA.js — 200 — 23.3 KiB — 63 ms — h3https://www.google.com/js/th/Tsj2rE80jstpz6Q1k9XA1bynyWMKlWaB3UmUIkCsRnA.jswww.google.com/js/th/Tsj2rE80jstpz6... https://www.google.com/js/th/Tsj2rE80jstpz6Q1k9XA1bynyWMKlWaB3UmUIkCsRnA.js — 200 — 0 B — 49 ms — h3https://www.youtube.com/generate_204?bopBtAwww.youtube.com/generate_204?bopBtA https://www.youtube.com/generate_204?bopBtA — 204 — 10 B — 24 ms — h3https://www.youtube.com/generate_204?uM-gIQwww.youtube.com/generate_204?uM-gIQ https://www.youtube.com/generate_204?uM-gIQ — 204 — 10 B — 23 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 96 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 74 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 189 B — 32 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 30 ms — h2https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 36 ms — h3https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 29 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
51% of JavaScript execution is third-party
First-party Third-party 1200ms · 263KB · €13/mo
Unattributable
Other
Costly
Execution 613ms
Transfer 0 KB
Monthly Cost €7/mo
script.crazyegg.com
Other
Costly
Execution 354ms
Transfer 55 KB
Unused 51%
Monthly Cost €4/mo
script.crazyegg.com
Other
Optional
Execution 92ms
Transfer 100 KB
Unused 77%
Monthly Cost €1/mo
script.crazyegg.com
Other
Optional
Execution 75ms
Transfer 85 KB
Monthly Cost €1/mo
script.crazyegg.com
Other
Optional
Execution 66ms
Transfer 23 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 613ms and costs ~€7/month
  • script.crazyegg.com adds 354ms and costs ~€4/month

51% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 613ms 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

script.crazyegg.com takes 354ms 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

51% of script.crazyegg.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

77% of script.crazyegg.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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