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https://utwente.nl

Performance

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

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

Mobile Desktop
72
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.

1.48 s

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

4.24 s

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

34 ms

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

0.042

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

1.63 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.

5.19 s

Page Load Progression

649 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.9 s
4.5 s
5.2 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
5.1 MB transferred, 91 requests
FIX
5.1 MB transferred, 91 requests
Critical::
Page weighs 10.9 MB (5.1 MB transferred)
Warning::
Images are 3.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.9 MB
Warning::
JavaScript is 701 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 701 KB
Info::
91 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.1 MB / 2.4 MB budget
5.1 MB transferred
91 requests
1.1 g CO2 per page load
Images 3.9 MiB 77%
JavaScript 700.5 KiB 14%
Fonts 176.1 KiB 3%
CSS 130.6 KiB 3%
Other 97.6 KiB 2%
Other 33.3 KiB 1%
HTML 30.1 KiB 1%
Other 3.0 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 (5.1 MiB of 5.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2143ms total JS execution
FIX
2143ms total JS execution
Warning::
https://www.utwente.nl/en/: 1037ms CPU time
Warning::
https://utwente.becdn.net/.wh/ea/ap/utwente_base.w...: 497ms CPU time
Warning::
Unattributable: 302ms CPU time
Info::
https://tagging.utwente.nl/gtag/js?id=G-DHY20KGR51...: 138ms CPU time
Info::
https://tagging.utwente.nl/gtm.js?id=GTM-WW6CJT: 109ms CPU time
Warning::
Third-party scripts: 2143ms (100% of total)

Main Thread Breakdown

Style & Layout 42% Other 28% Script Evaluation 22% Script Parsing & Compilation 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.utwente.nl/en/1037ms6ms0ms3rd
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjs497ms202ms34ms3rd
Unattributable302ms6ms0ms3rd
https://tagging.utwente.nl/gtag/js?id=G-DHY20KGR51&cx=c&gtm=4e64h1&sign=8c5c99f406b1cc6ef166939b17e60dc2b9156b7b22a6124a049f95f7841e4fb7_20260421138ms103ms18ms3rd
https://tagging.utwente.nl/gtm.js?id=GTM-WW6CJT109ms88ms20ms3rd
https://collect.mopinion.com/assets/surveys/2.0/js/survey.min.js?v=1808202359ms27ms6ms3rd
D
JS Bundles
Action
11 scripts, 410 KB unused
FIX
11 scripts, 410 KB unused
Warning::
https://utwente.becdn.net/.wh/ea/ap/utwente_base.w...: 158 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://utwente.becdn.net/.wh/ea/ap/utwente_base.w...: 158 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: 410 KB
410 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjs248 KB158 KB (64%)✓3rd
https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjs0 KB158 KB (64%)✓3rd
https://tagging.utwente.nl/gtag/js?id=G-DHY20KGR51&cx=c&gtm=4e64h1&sign=8c5c99f406b1cc6ef166939b17e60dc2b9156b7b22a6124a049f95f7841e4fb7_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
91 resources · 5.1 MB · 410 KB savings available
FIX
91 resources · 5.1 MB · 410 KB savings available
Warning::
Page weight 4.1 MB over 1MB target
Got: 5.1 MB Expected: ≤ 1 MB
Info::
~410 KB of savings available
Warning::
90 third-party resources (100% of weight)
Info::
11 resources over 200KB
91 resources · 5.1 MiB · 90 third-party 4.1 MiB over 1MB target
Image 77% · 3.9 MiB
JavaScript 14% · 700.5 KiB
Font 3% · 176.1 KiB
CSS 3% · 131.7 KiB
Media 2% · 97.6 KiB
Other 1% · 35.9 KiB
Document 1% · 30.2 KiB

~410.5 KiB of savings available

Remove unused JavaScript: 410.5 KiB
C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.utwente.nl/.wh/ea/uc/ic3cdb03d0102b41c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.utwente.nl/.wh/ea/uc/i33fb4649010245f3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.utwente.nl/.wh/ea/uc/i8107514e01024610... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
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.
Warning::
https://www.utwente.nl/.wh/ea/uc/i583e773e01027167... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.utwente.nl/.wh/ea/uc/i9c8c4c2101027348... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.utwente.nl/.wh/ea/uc/if2365bf401026bea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.utwente.nl/.wh/ea/uc/i979170eb0102e134... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.utwente.nl/.wh/ea/uc/i08169b9701021a25... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 3.9 MB
0 oversized -0 KB
11 legacy format
9 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.5 s LCP 4.2 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 — 31 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 — 33 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 — 40 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 — 43 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 — 95 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 — 11 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-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUwaEQbjA.woff2memSYaGs126MiZpBA-UvWbX... https://gstatic.mopinion.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUwaEQbjA.woff2 — 13.9 KiB — 554 ms — font-display: swap
3de47ce5-a747-444b-b44b... woff2 swap
Size 24 KB
Load time 31 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 33 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 40 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 43 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 95 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 11 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 2.2 s
Risk FOUT — text flashes from fallback to web font
00c26472-7693-44a7-b100... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
c0898c8c-0b78-43ee-9041... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
d8bbf6a4-3b12-4429-bdf6... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
c70bd903-dd6a-4b66-85af... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
ut-iconfont-C6LEAJZ7.ttf ttf swap
Size 0 KB
Load time 0 ms
Start 2.3 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 554 ms
Start 4.3 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
91 requests over 4848ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.5 s LCP 4.2 shttps://utwente.nl// https://utwente.nl/ — 301 — 147 B — 689 ms — h2https://www.utwente.nl/www.utwente.nl/ https://www.utwente.nl/ — 200 — 14.0 KiB — 750 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 — 90 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 — 31 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 — 33 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 — 40 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 — 43 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 — 95 ms — h2https://utwente.becdn.net/.wh/ea/ap/utwente_base.ws2016/ap.mjsutwente.becdn.net/.wh/ea/ap/utwente... 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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 2143ms · 413KB · €23/mo
www.utwente.nl
Other
Costly
Execution 1037ms
Transfer 14 KB
Monthly Cost €11/mo
utwente.becdn.net
Other
Costly
Execution 497ms
Transfer 0 KB
Unused 64%
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 302ms
Transfer 0 KB
Monthly Cost €3/mo
tagging.utwente.nl
Other
Optional
Execution 138ms
Transfer 171 KB
Unused 38%
Monthly Cost €2/mo
tagging.utwente.nl
Other
Optional
Execution 109ms
Transfer 169 KB
Monthly Cost €1/mo
collect.mopinion.com
Other
Optional
Execution 59ms
Transfer 59 KB
Unused 52%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.utwente.nl adds 1037ms and costs ~€11/month
  • utwente.becdn.net adds 497ms and costs ~€5/month
  • Unattributable adds 302ms 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 1037ms 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 497ms 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 302ms 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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