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https://rwth-aachen.de

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

1.02 s

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

2.58 s

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

0 ms

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

0.015

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

1.23 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.

2.59 s

Page Load Progression

450 ms
901 ms
1.4 s
1.8 s
2.3 s
2.7 s
3.2 s
3.6 s
Checks
15
7 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
3.2 MB transferred, 46 requests
FIX
3.2 MB transferred, 46 requests
Warning::
Page weighs 3.6 MB (3.2 MB transferred)
Warning::
Images are 2.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.9 MB
Info::
Fonts are 230 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 230 KB
Info::
46 HTTP requests
Info::
Estimated 0.67 g CO2 per page load
3.2 MB / 2.4 MB budget
3.2 MB transferred
46 requests
0.67 g CO2 per page load
Images 2.9 MiB 90%
Fonts 229.6 KiB 7%
JavaScript 49.3 KiB 2%
CSS 39.2 KiB 1%
HTML 20.3 KiB 1%
Other 989 B 0%
Other 712 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

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

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 (3.2 MiB of 3.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
46 resources · 3.2 MB · 30 KB savings available
FIX
46 resources · 3.2 MB · 30 KB savings available
Warning::
Page weight 2.2 MB over 1MB target
Got: 3.2 MB Expected: ≤ 1 MB
Warning::
44 third-party resources (100% of weight)
Info::
6 resources over 200KB
46 resources · 3.2 MiB · 44 third-party 2.2 MiB over 1MB target
Image 90% · 2.9 MiB
Font 7% · 229.6 KiB
JavaScript 2% · 49.3 KiB
CSS 1% · 39.2 KiB
Document 1% · 20.7 KiB
Other 0% · 989 B

~29.8 KiB of savings available

Remove unused JavaScript: 29.8 KiB
C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.rwth-aachen.de/global/show_picture.asp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rwth-aachen.de/global/show_picture.asp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rwth-aachen.de/global/show_picture.asp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 2.9 MB
0 oversized -0 KB
20 legacy format
3 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

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

Green Hosting

No green hosting detected

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

private

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
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
385ms total JS execution
PASS
385ms total JS execution
Info::
https://www.rwth-aachen.de/cms/~a/root/?lidx=1: 218ms CPU time
Info::
https://www.rwth-aachen.de/custom/rwth/resources/j...: 105ms CPU time
Info::
Unattributable: 63ms CPU time
Warning::
Third-party scripts: 385ms (100% of total)

Main Thread Breakdown

Style & Layout 38% Other 34% Rendering 12% Script Evaluation 11% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.rwth-aachen.de/cms/~a/root/?lidx=1218ms3ms1ms3rd
https://www.rwth-aachen.de/custom/rwth/resources/js/_rwth.js105ms40ms3ms3rd
Unattributable63ms1ms0ms3rd
A+
Font Loading
3 fonts (230 KB)
PASS
3 fonts (230 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

230 KB total

Render-blocking

0

of 3

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 2.5 s FCP 1.0 s LCP 2.6 shttps://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-light.woff2plain-light.woff2 https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-light.woff2 — 76.1 KiB — 552 ms — font-display: swaphttps://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-medium.woff2plain-medium.woff2 https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-medium.woff2 — 77.5 KiB — 557 ms — font-display: swaphttps://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-ultralight.woff2plain-ultralight.woff2 https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-ultralight.woff2 — 75.9 KiB — 561 ms — font-display: swap
plain-light.woff2 woff2 swap
Size 76 KB
Load time 552 ms
Start 603 ms
Risk FOUT — text flashes from fallback to web font
plain-medium.woff2 woff2 swap
Size 78 KB
Load time 557 ms
Start 604 ms
Risk FOUT — text flashes from fallback to web font
plain-ultralight.woff2 woff2 swap
Size 76 KB
Load time 561 ms
Start 604 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)
A+
JS Bundles
1 scripts, 30 KB unused
PASS
1 scripts, 30 KB unused
Warning::
https://www.rwth-aachen.de/custom/rwth/resources/j...: 30 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 30 KB
30 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.rwth-aachen.de/custom/rwth/resources/js/_rwth.js49 KB30 KB (61%)✓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

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
46 requests over 1293ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.6 shttps://rwth-aachen.de// https://rwth-aachen.de/ — 302 — 358 B — 159 ms — h2https://rwth-aachen.de/go/id/a/?lidx=1/go/id/a/?lidx=1 https://rwth-aachen.de/go/id/a/?lidx=1 — 301 — 63 B — 43 ms — h2https://www.rwth-aachen.de/cms/~a/root/?lidx=1www.rwth-aachen.de/cms/~a/root/?lid... https://www.rwth-aachen.de/cms/~a/root/?lidx=1 — 200 — 20.3 KiB — 115 ms — h2https://www.rwth-aachen.de/custom/rwth/resources/css/core.csswww.rwth-aachen.de/custom/rwth/reso... https://www.rwth-aachen.de/custom/rwth/resources/css/core.css — 200 — 32.9 KiB — 99 ms — h2https://www.rwth-aachen.de/custom/rwth/resources/js/_rwth.jswww.rwth-aachen.de/custom/rwth/reso... https://www.rwth-aachen.de/custom/rwth/resources/js/_rwth.js — 200 — 49.3 KiB — 194 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaagazbwww.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaagazb — 200 — 5.6 KiB — 193 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadljdaav&clip=center,888,592&w2=888&h2=592&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadljdaav&clip=center,888,592&w2=888&h2=592&q=75 — 200 — 50.0 KiB — 254 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadliuxuq&clip=center,888,592&w2=888&h2=592&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadliuxuq&clip=center,888,592&w2=888&h2=592&q=75 — 200 — 117.0 KiB — 191 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrkxqd&clip=center,1920,960&w2=1920&h2=960&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrkxqd&clip=center,1920,960&w2=1920&h2=960&q=75 — 200 — 279.4 KiB — 336 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadacjdsx&clip=top,590,590&w2=590&h2=590&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadacjdsx&clip=top,590,590&w2=590&h2=590&q=75 — 200 — 118.8 KiB — 367 ms — h2https://www.rwth-aachen.de/manifest.jsonwww.rwth-aachen.de/manifest.json https://www.rwth-aachen.de/manifest.json — 200 — 989 B — 134 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaabprlnnq&clip=center,1920,960&w2=1920&h2=960&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaabprlnnq&clip=center,1920,960&w2=1920&h2=960&q=75 — 200 — 253.7 KiB — 429 ms — h2data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="black" viewBox="0 0 24.8 18">…www.w3.org/2000/svg" fill="black" v... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="black" viewBox="0 0 24.8 18">… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><pa…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 18"><pa…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 18"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 38 38"><pa…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 38 38"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 7 12"><pat…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 7 12"><pat… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 19 70"><pa…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 19 70"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="white" viewBox="0 0 24.8 18">…www.w3.org/2000/svg" fill="white" v... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="white" viewBox="0 0 24.8 18">… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awe…www.w3.org/2000/svg" viewBox="0 0 4... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awe… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awe…www.w3.org/2000/svg" viewBox="0 0 4... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awe… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 576 512"><!--!Font Awe…www.w3.org/2000/svg" viewBox="0 0 5... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 576 512"><!--!Font Awe… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awe…www.w3.org/2000/svg" viewBox="0 0 4... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awe… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><!--!Font Awe…www.w3.org/2000/svg" viewBox="0 0 3... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><!--!Font Awe… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awe…www.w3.org/2000/svg" viewBox="0 0 4... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--!Font Awe… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--!Font Awe…www.w3.org/2000/svg" viewBox="0 0 5... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--!Font Awe… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 640"><!--!Font Awe…www.w3.org/2000/svg" viewBox="0 0 6... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 640"><!--!Font Awe… — 200 — 0 B — 0 ms — datahttps://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaaaafawww.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaaaafa — 200 — 6.2 KiB — 383 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzaog&clip=center,1920,840&w2=1920&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzaog&clip=center,1920,840&w2=1920&h2=840&q=75 — 200 — 375.2 KiB — 441 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryyjv&clip=center,1920,840&w2=1920&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryyjv&clip=center,1920,840&w2=1920&h2=840&q=75 — 200 — 249.1 KiB — 473 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.6 shttps://rwth-aachen.de// https://rwth-aachen.de/ — 302 — 358 B — 159 ms — h2https://rwth-aachen.de/go/id/a/?lidx=1/go/id/a/?lidx=1 https://rwth-aachen.de/go/id/a/?lidx=1 — 301 — 63 B — 43 ms — h2https://www.rwth-aachen.de/cms/~a/root/?lidx=1www.rwth-aachen.de/cms/~a/root/?lid... https://www.rwth-aachen.de/cms/~a/root/?lidx=1 — 200 — 20.3 KiB — 115 ms — h2https://www.rwth-aachen.de/custom/rwth/resources/css/core.csswww.rwth-aachen.de/custom/rwth/reso... https://www.rwth-aachen.de/custom/rwth/resources/css/core.css — 200 — 32.9 KiB — 99 ms — h2https://www.rwth-aachen.de/custom/rwth/resources/js/_rwth.jswww.rwth-aachen.de/custom/rwth/reso... https://www.rwth-aachen.de/custom/rwth/resources/js/_rwth.js — 200 — 49.3 KiB — 194 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaagazbwww.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaagazb — 200 — 5.6 KiB — 193 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadljdaav&clip=center,888,592&w2=888&h2=592&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadljdaav&clip=center,888,592&w2=888&h2=592&q=75 — 200 — 50.0 KiB — 254 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadliuxuq&clip=center,888,592&w2=888&h2=592&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadliuxuq&clip=center,888,592&w2=888&h2=592&q=75 — 200 — 117.0 KiB — 191 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrkxqd&clip=center,1920,960&w2=1920&h2=960&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrkxqd&clip=center,1920,960&w2=1920&h2=960&q=75 — 200 — 279.4 KiB — 336 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadacjdsx&clip=top,590,590&w2=590&h2=590&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadacjdsx&clip=top,590,590&w2=590&h2=590&q=75 — 200 — 118.8 KiB — 367 ms — h2https://www.rwth-aachen.de/manifest.jsonwww.rwth-aachen.de/manifest.json https://www.rwth-aachen.de/manifest.json — 200 — 989 B — 134 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaabprlnnq&clip=center,1920,960&w2=1920&h2=960&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaabprlnnq&clip=center,1920,960&w2=1920&h2=960&q=75 — 200 — 253.7 KiB — 429 ms — h2data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="black" viewBox="0 0 24.8 18">…www.w3.org/2000/svg" fill="black" v... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="black" viewBox="0 0 24.8 18">… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><pa…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 18"><pa…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 18"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 38 38"><pa…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 38 38"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 7 12"><pat…www.w3.org/2000/svg" fill="none" vi... data:image/svg+xml;utf8,<svg 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h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzbsb&clip=center,1920,840&w2=1920&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzbsb&clip=center,1920,840&w2=1920&h2=840&q=75 — 200 — 455.5 KiB — 559 ms — h2https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-light.woff2www.rwth-aachen.de/custom/rwth/reso... https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-light.woff2 — 200 — 76.1 KiB — 552 ms — h2https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-medium.woff2www.rwth-aachen.de/custom/rwth/reso... https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-medium.woff2 — 200 — 77.5 KiB — 557 ms — h2https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-ultralight.woff2www.rwth-aachen.de/custom/rwth/reso... https://www.rwth-aachen.de/custom/rwth/resources/fonts/plain-ultralight.woff2 — 200 — 75.9 KiB — 561 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaescncwww.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaescnc — 200 — 9.1 KiB — 493 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadddkgza&clip=center,767,600&w2=767&h2=600&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadddkgza&clip=center,767,600&w2=767&h2=600&q=75 — 200 — 129.9 KiB — 521 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadfbdyeq&clip=center,767,600&w2=767&h2=600&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadfbdyeq&clip=center,767,600&w2=767&h2=600&q=75 — 200 — 229.4 KiB — 527 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczhdeld&clip=center,767,600&w2=767&h2=600&q=75www.rwth-aachen.de/global/show_pict... 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h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadlhjpcf&clip=center,576,576&w2=576&h2=576&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadlhjpcf&clip=center,576,576&w2=576&h2=576&q=75 — 200 — 67.9 KiB — 577 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadlgpgki&clip=center,576,576&w2=576&h2=576&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadlgpgki&clip=center,576,576&w2=576&h2=576&q=75 — 200 — 91.8 KiB — 583 ms — h2https://www.rwth-aachen.de/custom/rwth/resources/css/print.csswww.rwth-aachen.de/custom/rwth/reso... https://www.rwth-aachen.de/custom/rwth/resources/css/print.css — 200 — 6.2 KiB — 584 ms — h2https://www.rwth-aachen.de/favicon-32x32.pngwww.rwth-aachen.de/favicon-32x32.pn... https://www.rwth-aachen.de/favicon-32x32.png — 200 — 291 B — 34 ms — h2
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 385ms · 70KB · €4/mo
www.rwth-aachen.de
Other
Costly
Execution 218ms
Transfer 20 KB
Monthly Cost €2/mo
www.rwth-aachen.de
Other
Optional
Execution 105ms
Transfer 49 KB
Unused 61%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 63ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.rwth-aachen.de adds 218ms and costs ~€2/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.rwth-aachen.de takes 218ms 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

61% of www.rwth-aachen.de'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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