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https://utwente.nl

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
43
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

4.46 s

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

20.32 s

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

509 ms

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

0.146

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

5.87 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.

23.77 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
4.8 MB transferred, 87 requests
FIX
4.8 MB transferred, 87 requests
Critical::
Page weighs 9.4 MB (4.8 MB transferred)
Warning::
Images are 3.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.8 MB
Warning::
JavaScript is 700 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 700 KB
Info::
87 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.8 MB / 2.4 MB budget
4.8 MB transferred
87 requests
1.0 g CO2 per page load
Images 3.8 MiB 78%
JavaScript 700.4 KiB 14%
Fonts 176.1 KiB 4%
CSS 130.6 KiB 3%
Other 33.3 KiB 1%
HTML 30.1 KiB 1%
Other 3.1 KiB 0%
Other 1.3 KiB 0%
Other 539 B 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 (4.8 MiB of 4.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5279ms total JS execution
FIX
5279ms total JS execution
Warning::
https://www.utwente.nl/en/: 1595ms CPU time
Warning::
https://utwente.becdn.net/.wh/ea/ap/utwente_base.w...: 1321ms CPU time
Warning::
Unattributable: 937ms CPU time
Warning::
https://tagging.utwente.nl/gtag/js?id=G-DHY20KGR51...: 494ms CPU time
Warning::
https://tagging.utwente.nl/gtm.js?id=GTM-WW6CJT: 434ms CPU time
Warning::
Third-party scripts: 5279ms (100% of total)

Main Thread Breakdown

Script Evaluation 32% Other 30% Style & Layout 25% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.utwente.nl/en/1595ms19ms2ms3rd
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjs1321ms651ms135ms3rd
Unattributable937ms15ms0ms3rd
https://tagging.utwente.nl/gtag/js?id=G-DHY20KGR51&cx=c&gtm=4e64h1&sign=4f3621c4bb5e9474852988429993d7f4cfafa5313cb616ef992466d0a3ba6e09_20260421494ms416ms70ms3rd
https://tagging.utwente.nl/gtm.js?id=GTM-WW6CJT434ms349ms77ms3rd
https://collect.mopinion.com/assets/surveys/2.0/js/survey.min.js?v=18082023250ms104ms24ms3rd
https://deploy.mopinion.com/js/pastease.js193ms151ms7ms3rd
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.css54ms0ms0ms3rd
D
JS Bundles
Action
11 scripts, 413 KB unused
FIX
11 scripts, 413 KB unused
Warning::
https://utwente.becdn.net/.wh/ea/ap/utwente_base.w...: 160 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://utwente.becdn.net/.wh/ea/ap/utwente_base.w...: 160 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tagging.utwente.nl/gtag/js?id=G-DHY20KGR51...: 64 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://collect.mopinion.com/assets/surveys/2.0/js...: 30 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 413 KB
413 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjs248 KB160 KB (64%)✓3rd
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjs0 KB160 KB (64%)✓3rd
https://tagging.utwente.nl/gtag/js?id=G-DHY20KGR51&cx=c&gtm=4e64h1&sign=4f3621c4bb5e9474852988429993d7f4cfafa5313cb616ef992466d0a3ba6e09_20260421171 KB64 KB (38%)✓3rd
https://collect.mopinion.com/assets/surveys/2.0/js/survey.min.js?v=1808202359 KB30 KB (52%)✓3rd
https://tagging.utwente.nl/gtm.js?id=GTM-WW6CJT0 KB—✓3rd
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/chunk-T73UGGDL.mjs23 KB—✓3rd
https://tagging.utwente.nl/gtm.js?id=GTM-WW6CJT169 KB—✓3rd
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/chunk-T73UGGDL.mjs0 KB—✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WW6CJT&gtg_health=10 KB—✓3rd
https://deploy.mopinion.com/js/pastease.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

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
87 resources · 4.8 MB · 413 KB savings available
FIX
87 resources · 4.8 MB · 413 KB savings available
Warning::
Page weight 3.8 MB over 1MB target
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~413 KB of savings available
Warning::
86 third-party resources (100% of weight)
Info::
10 resources over 200KB
87 resources · 4.8 MiB · 86 third-party 3.8 MiB over 1MB target
Image 78% · 3.8 MiB
JavaScript 14% · 700.4 KiB
Font 4% · 176.1 KiB
CSS 3% · 131.7 KiB
Other 1% · 35.9 KiB
Document 1% · 30.2 KiB

~413.2 KiB of savings available

Remove unused JavaScript: 413.2 KiB
B
Image Optimization
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://utwente.becdn.net/.publisher/sd/utwente_ba... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 3.8 MB
0 oversized -0 KB
10 legacy format
1 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
13 fonts (176 KB)
PASS
13 fonts (176 KB)
Info::
13 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

13

176 KB total

Render-blocking

0

of 13

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 4.5 s LCP 20.3 shttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/3de47ce5-a747-444b-b44b-20e0f8736ac8.woff23de47ce5-a747-444b-b44b... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/3de47ce5-a747-444b-b44b-20e0f8736ac8.woff2 — 23.7 KiB — 26 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/00c26472-7693-44a7-b100-b1a1fe462d3b.woff200c26472-7693-44a7-b100... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/00c26472-7693-44a7-b100-b1a1fe462d3b.woff2 — 27.1 KiB — 31 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c0898c8c-0b78-43ee-9041-92bf98faf813.woff2c0898c8c-0b78-43ee-9041... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c0898c8c-0b78-43ee-9041-92bf98faf813.woff2 — 26.4 KiB — 34 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/d8bbf6a4-3b12-4429-bdf6-3d0124de945d.woff2d8bbf6a4-3b12-4429-bdf6... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/d8bbf6a4-3b12-4429-bdf6-3d0124de945d.woff2 — 25.3 KiB — 42 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c70bd903-dd6a-4b66-85af-fc3b07e97100.woff2c70bd903-dd6a-4b66-85af... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c70bd903-dd6a-4b66-85af-fc3b07e97100.woff2 — 28.1 KiB — 38 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ut-iconfont-C6LEAJZ7.ttfut-iconfont-C6LEAJZ7.ttf https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ut-iconfont-C6LEAJZ7.ttf — 31.5 KiB — 10 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/3de47ce5-a747-444b-b44b-20e0f8736ac8.woff23de47ce5-a747-444b-b44b... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/3de47ce5-a747-444b-b44b-20e0f8736ac8.woff2 — 0 B — 0 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/00c26472-7693-44a7-b100-b1a1fe462d3b.woff200c26472-7693-44a7-b100... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/00c26472-7693-44a7-b100-b1a1fe462d3b.woff2 — 0 B — 0 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c0898c8c-0b78-43ee-9041-92bf98faf813.woff2c0898c8c-0b78-43ee-9041... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c0898c8c-0b78-43ee-9041-92bf98faf813.woff2 — 0 B — 0 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/d8bbf6a4-3b12-4429-bdf6-3d0124de945d.woff2d8bbf6a4-3b12-4429-bdf6... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/d8bbf6a4-3b12-4429-bdf6-3d0124de945d.woff2 — 0 B — 0 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c70bd903-dd6a-4b66-85af-fc3b07e97100.woff2c70bd903-dd6a-4b66-85af... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c70bd903-dd6a-4b66-85af-fc3b07e97100.woff2 — 0 B — 0 ms — font-display: swaphttps://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ut-iconfont-C6LEAJZ7.ttfut-iconfont-C6LEAJZ7.ttf https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ut-iconfont-C6LEAJZ7.ttf — 0 B — 0 ms — font-display: swaphttps://gstatic.mopinion.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUx6EQ.woff2memSYaGs126MiZpBA-UvWbX... https://gstatic.mopinion.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUx6EQ.woff2 — 13.9 KiB — 520 ms — font-display: swap
3de47ce5-a747-444b-b44b... woff2 swap
Size 24 KB
Load time 26 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
00c26472-7693-44a7-b100... woff2 swap
Size 27 KB
Load time 31 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
c0898c8c-0b78-43ee-9041... woff2 swap
Size 26 KB
Load time 34 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
d8bbf6a4-3b12-4429-bdf6... woff2 swap
Size 25 KB
Load time 42 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
c70bd903-dd6a-4b66-85af... woff2 swap
Size 28 KB
Load time 38 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
ut-iconfont-C6LEAJZ7.ttf ttf swap
Size 32 KB
Load time 10 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
3de47ce5-a747-444b-b44b... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
00c26472-7693-44a7-b100... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
c0898c8c-0b78-43ee-9041... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
d8bbf6a4-3b12-4429-bdf6... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
c70bd903-dd6a-4b66-85af... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
ut-iconfont-C6LEAJZ7.ttf ttf swap
Size 0 KB
Load time 0 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 14 KB
Load time 520 ms
Start 4.1 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)

Fixing the unchecked items could save ~9 KB and ~18 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
—

6 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
87 requests over 4618ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 4.5 s LCP 20.3 shttps://utwente.nl// https://utwente.nl/ — 301 — 147 B — 688 ms — h2https://www.utwente.nl/www.utwente.nl/ https://www.utwente.nl/ — 200 — 14.0 KiB — 768 ms — h2https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.cssutwente.becdn.net/.wh/ea/ap/utwente... https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.css — 200 — 128.6 KiB — 51 ms — h2https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/3de47ce5-a747-444b-b44b-20e0f8736ac8.woff2utwente.becdn.net/.wh/ea/mod/utwent... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/3de47ce5-a747-444b-b44b-20e0f8736ac8.woff2 — 200 — 23.7 KiB — 26 ms — h2https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/00c26472-7693-44a7-b100-b1a1fe462d3b.woff2utwente.becdn.net/.wh/ea/mod/utwent... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/00c26472-7693-44a7-b100-b1a1fe462d3b.woff2 — 200 — 27.1 KiB — 31 ms — h2https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c0898c8c-0b78-43ee-9041-92bf98faf813.woff2utwente.becdn.net/.wh/ea/mod/utwent... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c0898c8c-0b78-43ee-9041-92bf98faf813.woff2 — 200 — 26.4 KiB — 34 ms — h2https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/d8bbf6a4-3b12-4429-bdf6-3d0124de945d.woff2utwente.becdn.net/.wh/ea/mod/utwent... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/d8bbf6a4-3b12-4429-bdf6-3d0124de945d.woff2 — 200 — 25.3 KiB — 42 ms — h2https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c70bd903-dd6a-4b66-85af-fc3b07e97100.woff2utwente.becdn.net/.wh/ea/mod/utwent... https://utwente.becdn.net/.wh/ea/mod/utwente_design/fonts/univers-next/c70bd903-dd6a-4b66-85af-fc3b07e97100.woff2 — 200 — 28.1 KiB — 38 ms — h2https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjsutwente.becdn.net/.wh/ea/ap/utwente... https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjs — 200 — 247.9 KiB — 78 ms — h2https://tagging.utwente.nl/gtm.js?id=GTM-WW6CJTtagging.utwente.nl/gtm.js?id=GTM-WW... https://tagging.utwente.nl/gtm.js?id=GTM-WW6CJT — -1 — 0 B — 590 ms — https://utwente.becdn.net/.publisher/sd/utwente_base/ws2016/img/logos/ut-logo-white-en.svgutwente.becdn.net/.publisher/sd/utw... https://utwente.becdn.net/.publisher/sd/utwente_base/ws2016/img/logos/ut-logo-white-en.svg — 200 — 2.9 KiB — 82 ms — h2https://utwente.becdn.net/.wh/ea/uc/ib400cca8010247a24301d8b59502dc8ceef70539322d0701c1b801b80185/4tu.avifutwente.becdn.net/.wh/ea/uc/ib400cc... https://utwente.becdn.net/.wh/ea/uc/ib400cca8010247a24301d8b59502dc8ceef70539322d0701c1b801b80185/4tu.avif — 200 — 5.1 KiB — 269 ms — h2https://utwente.becdn.net/.wh/ea/uc/i8e39b7f9010249a24301d8b5950297d6367408f0ee150701c1b801b80185/eciu-logo-white.avifutwente.becdn.net/.wh/ea/uc/i8e39b7... https://utwente.becdn.net/.wh/ea/uc/i8e39b7f9010249a24301d8b5950297d6367408f0ee150701c1b801b80185/eciu-logo-white.avif — 200 — 16.4 KiB — 269 ms — h2https://utwente.becdn.net/.wh/ea/uc/ie52469d501028c646f0195469702588ce9b2a2ff725d0301c000/ut-letters.jpgutwente.becdn.net/.wh/ea/uc/ie52469... https://utwente.becdn.net/.wh/ea/uc/ie52469d501028c646f0195469702588ce9b2a2ff725d0301c000/ut-letters.jpg — 200 — 238.1 KiB — 57 ms — h2https://utwente.becdn.net/.wh/ea/uc/i3ecc41e001029b7e480195469702a11dabd8ede56c930301c000/mesa-cleanroom.jpgutwente.becdn.net/.wh/ea/uc/i3ecc41... https://utwente.becdn.net/.wh/ea/uc/i3ecc41e001029b7e480195469702a11dabd8ede56c930301c000/mesa-cleanroom.jpg — 200 — 178.3 KiB — 101 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 5279ms · 426KB · €58/mo
www.utwente.nl
Other
Costly
Execution 1595ms
Transfer 14 KB
Monthly Cost €17/mo
utwente.becdn.net
Other
Costly
Execution 1321ms
Transfer 0 KB
Unused 64%
Monthly Cost €14/mo
Unattributable
Other
Costly
Execution 937ms
Transfer 0 KB
Monthly Cost €10/mo
tagging.utwente.nl
Other
Costly
Execution 494ms
Transfer 171 KB
Unused 38%
Monthly Cost €5/mo
tagging.utwente.nl
Other
Costly
Execution 434ms
Transfer 169 KB
Monthly Cost €5/mo
collect.mopinion.com
Other
Costly
Execution 250ms
Transfer 59 KB
Unused 52%
Monthly Cost €3/mo
deploy.mopinion.com
Other
Optional
Execution 193ms
Transfer 13 KB
Monthly Cost €2/mo
utwente.becdn.net
Other
Optional
Execution 54ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.utwente.nl adds 1595ms and costs ~€17/month
  • utwente.becdn.net adds 1321ms and costs ~€14/month
  • Unattributable adds 937ms and costs ~€10/month
  • tagging.utwente.nl adds 494ms and costs ~€5/month
  • tagging.utwente.nl adds 434ms and costs ~€5/month
  • collect.mopinion.com adds 250ms and costs ~€3/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

www.utwente.nl takes 1595ms 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

utwente.becdn.net takes 1321ms 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

64% of utwente.becdn.net'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

Unattributable takes 937ms 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

tagging.utwente.nl takes 494ms 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

tagging.utwente.nl takes 434ms 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

collect.mopinion.com takes 250ms 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 collect.mopinion.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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