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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
5
REVIEW
8
PASS
10
INFO
4

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
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.
85
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.

2.81 s

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

5.02 s

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

378 ms

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

0.643

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

13.14 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.

13.78 s

Page Load Progression

1.0 s
2.1 s
3.1 s
4.1 s
5.2 s
6.2 s
7.3 s
8.3 s
Checks
27
10 PASS 8 REVIEW 5 FIX
D
Third-Party Impact
Action
72% third-party, 0 ms blocking
FIX
72% third-party, 0 ms blocking
Warning::
Third-party code accounts for 72% of page weight (1.1 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
28%
72%
First-party Third-party
D
JS Execution Cost
Action
3264ms total JS execution
FIX
3264ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 1607ms CPU time
Warning::
https://www.lioc.nl/en/: 621ms CPU time
Warning::
Unattributable: 390ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WFR...: 287ms CPU time
Info::
https://snap.licdn.com/li.lms-analytics/insight.mi...: 117ms CPU time
Warning::
Third-party scripts: 2253ms (69% of total)

Main Thread Breakdown

Script Evaluation 58% Other 17% Style & Layout 11% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js1607ms1400ms117ms3rd
https://www.lioc.nl/en/621ms10ms5ms1st
Unattributable390ms15ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-WFRVJTR287ms211ms54ms3rd
https://snap.licdn.com/li.lms-analytics/insight.min.js117ms86ms29ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js94ms66ms13ms3rd
https://code.jquery.com/ui/1.10.3/jquery-ui.min.js80ms45ms32ms3rd
https://www.google-analytics.com/analytics.js69ms56ms7ms3rd
F
JS Bundles
Action
18 scripts, 598 KB unused
FIX
18 scripts, 598 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 159 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 159 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 159 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WFR...: 68 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://code.jquery.com/ui/1.10.3/jquery-ui.min.js: 53 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 598 KB
598 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js0 KB159 KB (46%)✓3rd
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js347 KB159 KB (46%)✓3rd
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js348 KB159 KB (46%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WFRVJTR136 KB68 KB (50%)✓3rd
https://code.jquery.com/ui/1.10.3/jquery-ui.min.js59 KB53 KB (90%)✓3rd
https://www.google.com/recaptcha/api.js?render=6LdNUZkUAAAAAIL-EI7OnY5RtY9ZqgnntzilkCgH1 KB—✓3rd
https://www.lioc.nl/wp-includes/js/dist/vendor/wp-polyfill.min.js7 KB—✓1st
https://www.lioc.nl/wp-content/plugins/contact-form-7/includes/js/index.js4 KB—✓1st
https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js33 KB—✓3rd
https://www.lioc.nl/wp-content/plugins/contact-form-7/modules/recaptcha/index.js1 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

F
Page Weight Inventory
Action
43 resources · 1.5 MB · 598 KB savings available
FIX
43 resources · 1.5 MB · 598 KB savings available
Warning::
Page weight 1.5 MB exceeds 1 MB target by 518 KB
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~598 KB of savings available
Warning::
25 third-party resources (72% of weight)
Info::
3 resources over 200KB
43 resources · 1.5 MiB · 25 third-party 517.9 KiB over 1MB target
JavaScript 65% · 1007.4 KiB
Image 22% · 346.4 KiB
CSS 5% · 77.8 KiB
Font 5% · 71.3 KiB
Document 2% · 34.6 KiB
Other 0% · 4.4 KiB

~597.7 KiB of savings available

Remove unused JavaScript: 597.7 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.

B
Page Weight Budget
1.5 MB transferred, 43 requests
REVIEW
1.5 MB transferred, 43 requests
Info::
Page weighs 4.2 MB (1.5 MB transferred)
Warning::
JavaScript is 1007 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1007 KB
Info::
43 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
43 requests
0.32 g CO2 per page load
JavaScript 1007.4 KiB 65%
Images 344.3 KiB 22%
CSS 77.8 KiB 5%
Fonts 71.3 KiB 5%
HTML 34.6 KiB 2%
Other 3.1 KiB 0%
Other 2.6 KiB 0%
Other 824 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

C
Image Optimization
Action
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Warning::
https://www.lioc.nl/wp-content/themes/lioc/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lioc.nl/wp-content/themes/lioc/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
8 images 344 KB
0 oversized -0 KB
8 legacy format
2 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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
10 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Page uses document.write() -- disables Chrome's preload scanner
`document.write()` blocks all parallel resource discovery while it executes. Chrome explicitly disables the preload scanner on connections it judges slow when document.write is detected, serializing the entire subtree load. Almost always third-party ad / analytics legacy code; replacing with createElement + appendChild (or refusing to integrate the offending vendor) recovers significant load-time on mobile.
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
5 fonts (71 KB)
PASS
5 fonts (71 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

71 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.8 s LCP 5.0 shttps://fonts.gstatic.com/s/opensans/v15/mem5YaGs126MiZpBA-UN_r8OUuhpKKSTjw.woff2mem5YaGs126MiZpBA-UN_r8... https://fonts.gstatic.com/s/opensans/v15/mem5YaGs126MiZpBA-UN_r8OUuhpKKSTjw.woff2 — 8.6 KiB — 72 ms — font-display: swaphttps://fonts.gstatic.com/s/oxygen/v8/2sDfZG1Wl4LcnbuKjk0mRUe0Aw.woff22sDfZG1Wl4LcnbuKjk0mRUe... https://fonts.gstatic.com/s/oxygen/v8/2sDfZG1Wl4LcnbuKjk0mRUe0Aw.woff2 — 10.1 KiB — 73 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v15/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2mem8YaGs126MiZpBA-UFVZ0... https://fonts.gstatic.com/s/opensans/v15/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2 — 8.7 KiB — 73 ms — font-display: swaphttps://fonts.gstatic.com/s/oxygen/v8/2sDcZG1Wl4LcnbuCNWgzaGW5Kb8VZA.woff22sDcZG1Wl4LcnbuCNWgzaGW... https://fonts.gstatic.com/s/oxygen/v8/2sDcZG1Wl4LcnbuCNWgzaGW5Kb8VZA.woff2 — 10.1 KiB — 27 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 74 ms — font-display: swap
mem5YaGs126MiZpBA-UN_r8... woff2 swap
Size 9 KB
Load time 72 ms
Start 7.6 s
Risk FOUT — text flashes from fallback to web font
2sDfZG1Wl4LcnbuKjk0mRUe... woff2 swap
Size 10 KB
Load time 73 ms
Start 7.6 s
Risk FOUT — text flashes from fallback to web font
mem8YaGs126MiZpBA-UFVZ0... woff2 swap
Size 9 KB
Load time 73 ms
Start 7.6 s
Risk FOUT — text flashes from fallback to web font
2sDcZG1Wl4LcnbuCNWgzaGW... woff2 swap
Size 10 KB
Load time 27 ms
Start 7.7 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 74 ms
Start 9.0 s
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)
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
2
prefetch
—

2 resource hints configured

A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding,User-Agent
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
4 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
43 requests over 10077ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.8 s LCP 5.0 shttps://www.lioc.nl/en//en/ https://www.lioc.nl/en/ — 200 — 6.7 KiB — 7.2 s — h2https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.csscdn.jsdelivr.net/npm/slick-carousel... https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css — 200 — 999 B — 29 ms — h2https://www.lioc.nl/wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-list-horizontal/style.min.css/wp-content/plugins/sitepress-multi... https://www.lioc.nl/wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-list-horizontal/style.min.css — 200 — 417 B — 200 ms — h2https://www.lioc.nl/wp-content/themes/lioc/style.css/wp-content/themes/lioc/style.css https://www.lioc.nl/wp-content/themes/lioc/style.css — 200 — 29.6 KiB — 390 ms — h2https://www.lioc.nl/wp-content/themes/lioc/images/logo.png/wp-content/themes/lioc/images/logo... https://www.lioc.nl/wp-content/themes/lioc/images/logo.png — 200 — 7.0 KiB — 196 ms — h2https://www.lioc.nl/wp-content/themes/lioc/images/icons/phone.png/wp-content/themes/lioc/images/icon... https://www.lioc.nl/wp-content/themes/lioc/images/icons/phone.png — 200 — 1.8 KiB — 200 ms — h2https://www.lioc.nl/wp-content/uploads/2019/03/stolp-ei.png/wp-content/uploads/2019/03/stolp-e... https://www.lioc.nl/wp-content/uploads/2019/03/stolp-ei.png — 200 — 244.5 KiB — 945 ms — h2https://www.lioc.nl/wp-content/themes/lioc/images/stolp.png/wp-content/themes/lioc/images/stol... https://www.lioc.nl/wp-content/themes/lioc/images/stolp.png — 200 — 61.8 KiB — 955 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js — 200 — 33.4 KiB — 97 ms — h2https://code.jquery.com/ui/1.10.3/jquery-ui.min.jscode.jquery.com/ui/1.10.3/jquery-ui... https://code.jquery.com/ui/1.10.3/jquery-ui.min.js — 200 — 59.3 KiB — 53 ms — h2https://www.lioc.nl/wp-content/themes/lioc/js/plugins.js/wp-content/themes/lioc/js/plugins.... https://www.lioc.nl/wp-content/themes/lioc/js/plugins.js — 200 — 6.8 KiB — 954 ms — h2https://www.lioc.nl/wp-content/themes/lioc/js/slick.js/wp-content/themes/lioc/js/slick.js https://www.lioc.nl/wp-content/themes/lioc/js/slick.js — 200 — 14.8 KiB — 961 ms — h2https://www.lioc.nl/wp-content/themes/lioc/js/main.min.js/wp-content/themes/lioc/js/main.min... https://www.lioc.nl/wp-content/themes/lioc/js/main.min.js — 200 — 4.7 KiB — 959 ms — h2https://www.lioc.nl/wp-includes/js/dist/vendor/regenerator-runtime.min.js/wp-includes/js/dist/vendor/regener... https://www.lioc.nl/wp-includes/js/dist/vendor/regenerator-runtime.min.js — 200 — 2.5 KiB — 964 ms — h2https://www.lioc.nl/wp-includes/js/dist/vendor/wp-polyfill.min.js/wp-includes/js/dist/vendor/wp-poly... https://www.lioc.nl/wp-includes/js/dist/vendor/wp-polyfill.min.js — 200 — 7.0 KiB — 964 ms — h2https://www.lioc.nl/wp-content/plugins/contact-form-7/includes/js/index.js/wp-content/plugins/contact-form-7/... https://www.lioc.nl/wp-content/plugins/contact-form-7/includes/js/index.js — 200 — 4.0 KiB — 969 ms — h2https://www.lioc.nl/wp-includes/css/dist/block-library/style.min.css/wp-includes/css/dist/block-library... https://www.lioc.nl/wp-includes/css/dist/block-library/style.min.css — 200 — 11.5 KiB — 972 ms — h2https://www.google.com/recaptcha/api.js?render=6LdNUZkUAAAAAIL-EI7OnY5RtY9ZqgnntzilkCgHwww.google.com/recaptcha/api.js?ren... https://www.google.com/recaptcha/api.js?render=6LdNUZkUAAAAAIL-EI7OnY5RtY9ZqgnntzilkCgH — 200 — 1.0 KiB — 191 ms — h3https://www.lioc.nl/wp-content/plugins/contact-form-7/modules/recaptcha/index.js/wp-content/plugins/contact-form-7/... https://www.lioc.nl/wp-content/plugins/contact-form-7/modules/recaptcha/index.js — 200 — 923 B — 966 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WFRVJTRwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WFRVJTR — 200 — 136.1 KiB — 301 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 81 ms — h2https://snap.licdn.com/li.lms-analytics/insight.min.jssnap.licdn.com/li.lms-analytics/ins... https://snap.licdn.com/li.lms-analytics/insight.min.js — 200 — 21.3 KiB — 35 ms — h2https://www.lioc.nl/wp-content/themes/lioc/images/bg.jpg/wp-content/themes/lioc/images/bg.j... https://www.lioc.nl/wp-content/themes/lioc/images/bg.jpg — 200 — 26.0 KiB — 570 ms — h2https://fonts.gstatic.com/s/opensans/v15/mem5YaGs126MiZpBA-UN_r8OUuhpKKSTjw.woff2fonts.gstatic.com/s/opensans/v15/me... https://fonts.gstatic.com/s/opensans/v15/mem5YaGs126MiZpBA-UN_r8OUuhpKKSTjw.woff2 — 200 — 8.6 KiB — 72 ms — h3https://fonts.gstatic.com/s/oxygen/v8/2sDfZG1Wl4LcnbuKjk0mRUe0Aw.woff2fonts.gstatic.com/s/oxygen/v8/2sDfZ... 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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
69% of JavaScript execution is third-party
First-party Third-party 2253ms · 271KB · €24/mo
www.gstatic.com
Other
Costly
Execution 1607ms
Transfer 0 KB
Unused 46%
Monthly Cost €17/mo
Google Tag Manager
Tag Manager
Costly
Execution 287ms
Transfer 136 KB
Unused 50%
Monthly Cost €3/mo
LinkedIn Insight
Advertising
Optional
Execution 117ms
Transfer 21 KB
Monthly Cost €1/mo
ajax.googleapis.com
Other
Optional
Execution 94ms
Transfer 33 KB
Monthly Cost €1/mo
code.jquery.com
Other
Optional
Execution 80ms
Transfer 59 KB
Unused 90%
Monthly Cost €1/mo
Google Analytics
Analytics
Optional
Execution 69ms
Transfer 21 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 1607ms and costs ~€17/month
  • Google Tag Manager adds 287ms and costs ~€3/month

69% 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

www.gstatic.com takes 1607ms 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

Google Tag Manager takes 287ms 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

90% of code.jquery.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

Image Optimization
4 images, 315 KB total, 221 KB wasted
INFO

Image Optimization Audit

Total Images

4

Total Size

315 KB

Oversized

1

Wasted

221 KB

4 missing dimensions 1 missing lazy loading
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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