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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.

1.12 s

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

2.18 s

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

39 ms

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

0.002

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

1.12 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.

2.19 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
7 PASS 4 REVIEW 2 FIX
D
JS Bundles
Action
69 scripts, 369 KB unused
FIX
69 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-2d960c1a.dc71e9be.js5 KB—✓1st
https://europepmc.org/js/chunk-377d1f58.a9bfdc4d.js25 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
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
C
Page Weight Budget
Action
1.9 MB transferred, 147 requests
REVIEW
1.9 MB transferred, 147 requests
Info::
Page weighs 4.2 MB (1.9 MB transferred)
Warning::
JavaScript is 774 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 774 KB
Info::
Fonts are 616 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 616 KB
Warning::
147 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
147 requests
0.39 g CO2 per page load
JavaScript 774.4 KiB 40%
Fonts 616.4 KiB 32%
Other 329.5 KiB 17%
CSS 102.7 KiB 5%
Images 68.6 KiB 4%
HTML 17.2 KiB 1%
Other 6.4 KiB 0%
Other 0 B 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

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

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
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
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.
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/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.
11 images 69 KB
0 oversized -0 KB
9 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
Page Weight Inventory
Action
147 resources · 1.9 MB · 369 KB savings available
REVIEW
147 resources · 1.9 MB · 369 KB savings available
Warning::
Page weight 891 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~369 KB of savings available
Info::
12 third-party resources (14% of weight)
Info::
1 resources over 200KB
147 resources · 1.9 MiB · 12 third-party 891.2 KiB over 1MB target
JavaScript 54% · 1.0 MiB
Font 32% · 616.4 KiB
CSS 9% · 176.6 KiB
Image 4% · 69.2 KiB
Document 1% · 17.2 KiB
Other 0% · 6.4 KiB

~368.6 KiB of savings available

Remove unused JavaScript: 368.6 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
14% third-party, 0 ms blocking
PASS
14% third-party, 0 ms blocking
Info::
Third-party code accounts for 14% of page weight (272.4 KiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
86%
First-party Third-party
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+
JS Execution Cost
377ms total JS execution
PASS
377ms total JS execution
Info::
https://europepmc.org/: 123ms CPU time
Info::
Unattributable: 96ms CPU time
Info::
https://europepmc.org/js/app.a19c91e2.js: 95ms CPU time
Info::
https://script.crazyegg.com/pages/versioned/common...: 63ms CPU time
Info::
Third-party scripts: 158ms (42% of total)

Main Thread Breakdown

Script Evaluation 45% Other 26% Style & Layout 11% Script Parsing & Compilation 10% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://europepmc.org/123ms4ms1ms1st
Unattributable96ms2ms0ms3rd
https://europepmc.org/js/app.a19c91e2.js95ms80ms11ms1st
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js63ms56ms3ms3rd
A+
Font Loading
5 fonts (616 KB)
PASS
5 fonts (616 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

616 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 1.1 s LCP 2.2 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 — 209 ms — font-display: swaphttps://europepmc.org/fonts/OpenSans-Regular.629a55a7.ttfOpenSans-Regular.629a55... https://europepmc.org/fonts/OpenSans-Regular.629a55a7.ttf — 114.1 KiB — 210 ms — font-display: swaphttps://europepmc.org/fonts/OpenSans-Semibold.33f225b8.ttfOpenSans-Semibold.33f22... https://europepmc.org/fonts/OpenSans-Semibold.33f225b8.ttf — 116.6 KiB — 208 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 — 212 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 — 207 ms — font-display: swap
fa-solid-900.1ec0ba05.w... woff2 swap
Size 153 KB
Load time 209 ms
Start 450 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 210 ms
Start 450 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 208 ms
Start 451 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 212 ms
Start 451 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 207 ms
Start 451 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
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
147 requests over 1171ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.2 shttps://europepmc.org// https://europepmc.org/ — 200 — 17.2 KiB — 144 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 — 30.4 KiB — 101 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 — 120 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 — 829 B — 101 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 — 76 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 — 564 B — 104 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 — 135 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 — 131 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 — 130 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 — 143 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 — 143 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 — 100 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 — 176 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 — 183 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 — 195 B — 132 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 — 176 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 — 117 ms — h2https://europepmc.org/css/compromise.css/css/compromise.css https://europepmc.org/css/compromise.css — 200 — 1.7 KiB — 71 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 — 134 ms — h2https://europepmc.org/css/app.375f5c29.css/css/app.375f5c29.css https://europepmc.org/css/app.375f5c29.css — 200 — 15.9 KiB — 117 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 — 125 ms — h2https://europepmc.org/js/app.a19c91e2.js/js/app.a19c91e2.js https://europepmc.org/js/app.a19c91e2.js — 200 — 141.1 KiB — 180 ms — h2https://europepmc.org/js/chunk-vendors.6544f1b1.js/js/chunk-vendors.6544f1b1.js https://europepmc.org/js/chunk-vendors.6544f1b1.js — 200 — 210.1 KiB — 188 ms — h2https://europepmc.org/css/chunk-3c5a2476.1f22a5ad.css/css/chunk-3c5a2476.1f22a5ad.css https://europepmc.org/css/chunk-3c5a2476.1f22a5ad.css — 200 — 1.1 KiB — 129 ms — h2https://europepmc.org/js/chunk-3c5a2476.c57db6d1.js/js/chunk-3c5a2476.c57db6d1.js https://europepmc.org/js/chunk-3c5a2476.c57db6d1.js — 200 — 15.5 KiB — 132 ms — h2https://europepmc.org/css/chunk-30203c74.6f499fd3.css/css/chunk-30203c74.6f499fd3.css https://europepmc.org/css/chunk-30203c74.6f499fd3.css — 200 — 1.1 KiB — 129 ms — h2https://europepmc.org/js/chunk-30203c74.f0afd458.js/js/chunk-30203c74.f0afd458.js https://europepmc.org/js/chunk-30203c74.f0afd458.js — 200 — 894 B — 132 ms — h2https://europepmc.org/css/local-compromise.css/css/local-compromise.css https://europepmc.org/css/local-compromise.css — 200 — 708 B — 129 ms — h2https://europepmc.org/js_min/min/epmc-min.js?v=1.1.1/js_min/min/epmc-min.js?v=1.1.1 https://europepmc.org/js_min/min/epmc-min.js?v=1.1.1 — 200 — 2.5 KiB — 160 ms — h2https://europepmc.org/js_min/min/responsify-analytics-min.js?v=1.1.1/js_min/min/responsify-analytics-mi... https://europepmc.org/js_min/min/responsify-analytics-min.js?v=1.1.1 — 200 — 4.6 KiB — 170 ms — h2
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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
42% of JavaScript execution is third-party
First-party Third-party 158ms · 55KB · €2/mo
Unattributable
Other
Optional
Execution 96ms
Transfer 0 KB
Monthly Cost €1/mo
script.crazyegg.com
Other
Optional
Execution 63ms
Transfer 55 KB
Unused 51%
Monthly Cost €1/mo

42% 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

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

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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