Skip to content
https://rwth-aachen.de

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
63
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.

3.69 s

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

9.71 s

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

109 ms

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

0.000

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

5.18 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.

9.92 s

Page Load Progression

602 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
17
8 PASS 4 REVIEW 3 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 48 requests
FIX
2.2 MB transferred, 48 requests
Info::
Page weighs 2.6 MB (2.2 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 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::
48 HTTP requests
Info::
Estimated 0.45 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
48 requests
0.45 g CO2 per page load
Images 1.8 MiB 85%
Fonts 229.6 KiB 10%
JavaScript 49.3 KiB 2%
CSS 39.2 KiB 2%
HTML 20.3 KiB 1%
Other 989 B 0%
Other 702 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
48 resources · 2.2 MB · 30 KB savings available
FIX
48 resources · 2.2 MB · 30 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Warning::
46 third-party resources (100% of weight)
Info::
1 resources over 200KB
48 resources · 2.2 MiB · 46 third-party 1.2 MiB over 1MB target
Image 85% · 1.8 MiB
Font 10% · 229.6 KiB
JavaScript 2% · 49.3 KiB
CSS 2% · 39.2 KiB
Document 1% · 20.7 KiB
Other 0% · 989 B

~29.7 KiB of savings available

Remove unused JavaScript: 29.7 KiB
C
Image Optimization
Action
33 images, 0 KB saveable
REVIEW
33 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.
33 images 1.8 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
JS Execution Cost
Action
1447ms total JS execution
REVIEW
1447ms total JS execution
Warning::
https://www.rwth-aachen.de/cms/~a/root/?lidx=1: 641ms CPU time
Warning::
https://www.rwth-aachen.de/custom/rwth/resources/j...: 525ms CPU time
Warning::
Unattributable: 281ms CPU time
Warning::
Third-party scripts: 1447ms (100% of total)

Main Thread Breakdown

Style & Layout 40% Other 34% Script Evaluation 13% Rendering 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.rwth-aachen.de/cms/~a/root/?lidx=1641ms12ms3ms3rd
https://www.rwth-aachen.de/custom/rwth/resources/js/_rwth.js525ms166ms12ms3rd
Unattributable281ms6ms0ms3rd
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+
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.7 s LCP 9.7 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 — 247 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 — 77.4 KiB — 254 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 — 76.1 KiB — 273 ms — font-display: swap
plain-light.woff2 woff2 swap
Size 76 KB
Load time 247 ms
Start 555 ms
Risk FOUT — text flashes from fallback to web font
plain-medium.woff2 woff2 swap
Size 77 KB
Load time 254 ms
Start 556 ms
Risk FOUT — text flashes from fallback to web font
plain-ultralight.woff2 woff2 swap
Size 76 KB
Load time 273 ms
Start 556 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 (60%)
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 (60%)✓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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
—

3 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
48 requests over 1898ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.7 s LCP 9.7 shttps://rwth-aachen.de// https://rwth-aachen.de/ — 302 — 356 B — 155 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 — 40 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 — 108 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 — 91 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 — 174 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 — 175 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 — 203 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 — 109 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrkxqd&clip=center,768,960&w2=768&h2=960&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrkxqd&clip=center,768,960&w2=768&h2=960&q=75 — 200 — 143.9 KiB — 154 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 — 184 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,768,960&w2=768&h2=960&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaabprlnnq&clip=center,768,960&w2=768&h2=960&q=75 — 200 — 129.6 KiB — 212 ms — h2https://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 — 198 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 — datahttps://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryyjv&clip=center,480,840&w2=480&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryyjv&clip=center,480,840&w2=480&h2=840&q=75 — 200 — 73.8 KiB — 192 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzaog&clip=center,480,840&w2=480&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzaog&clip=center,480,840&w2=480&h2=840&q=75 — 200 — 93.6 KiB — 199 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryunm&clip=center,480,840&w2=480&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryunm&clip=center,480,840&w2=480&h2=840&q=75 — 200 — 42.0 KiB — 219 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzbsb&clip=center,480,840&w2=480&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzbsb&clip=center,480,840&w2=480&h2=840&q=75 — 200 — 127.2 KiB — 227 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 — 247 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 — 77.4 KiB — 254 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 — 76.1 KiB — 273 ms — h2data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 44 45"><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 44 45"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 44 45"><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 44 45"><pa… — 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 — data
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.7 s LCP 9.7 shttps://rwth-aachen.de// https://rwth-aachen.de/ — 302 — 356 B — 155 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 — 40 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 — 108 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 — 91 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 — 174 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 — 175 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 — 203 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 — 109 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrkxqd&clip=center,768,960&w2=768&h2=960&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrkxqd&clip=center,768,960&w2=768&h2=960&q=75 — 200 — 143.9 KiB — 154 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 — 184 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,768,960&w2=768&h2=960&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaabprlnnq&clip=center,768,960&w2=768&h2=960&q=75 — 200 — 129.6 KiB — 212 ms — h2https://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 — 198 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 — datahttps://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryyjv&clip=center,480,840&w2=480&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryyjv&clip=center,480,840&w2=480&h2=840&q=75 — 200 — 73.8 KiB — 192 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzaog&clip=center,480,840&w2=480&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzaog&clip=center,480,840&w2=480&h2=840&q=75 — 200 — 93.6 KiB — 199 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryunm&clip=center,480,840&w2=480&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddryunm&clip=center,480,840&w2=480&h2=840&q=75 — 200 — 42.0 KiB — 219 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzbsb&clip=center,480,840&w2=480&h2=840&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaddrzbsb&clip=center,480,840&w2=480&h2=840&q=75 — 200 — 127.2 KiB — 227 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 — 247 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 — 77.4 KiB — 254 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 — 76.1 KiB — 273 ms — h2data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 44 45"><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 44 45"><pa… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 44 45"><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 44 45"><pa… — 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=aaaaaaaaaaescncwww.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaaaescnc — 200 — 9.2 KiB — 188 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 — 198 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 — 227 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... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczhdeld&clip=center,767,600&w2=767&h2=600&q=75 — 200 — 86.9 KiB — 245 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaacwiwjiw&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=aaaaaaaacwiwjiw&clip=center,767,600&w2=767&h2=600&q=75 — 200 — 146.8 KiB — 255 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 — 256 ms — h2https://www.rwth-aachen.de/favicon-32x32.pngwww.rwth-aachen.de/favicon-32x32.pn... https://www.rwth-aachen.de/favicon-32x32.png — 200 — 283 B — 32 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadkhlhbk&clip=center,715,715&w2=715&h2=715&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadkhlhbk&clip=center,715,715&w2=715&h2=715&q=75 — 200 — 42.5 KiB — 374 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrlhxv&clip=center,715,715&w2=715&h2=715&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaaczrlhxv&clip=center,715,715&w2=715&h2=715&q=75 — 200 — 119.2 KiB — 345 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadlhjpcf&clip=center,715,715&w2=715&h2=715&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadlhjpcf&clip=center,715,715&w2=715&h2=715&q=75 — 200 — 84.0 KiB — 260 ms — h2https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadlgpgki&clip=center,715,715&w2=715&h2=715&q=75www.rwth-aachen.de/global/show_pict... https://www.rwth-aachen.de/global/show_picture.asp?id=aaaaaaaadlgpgki&clip=center,715,715&w2=715&h2=715&q=75 — 200 — 114.4 KiB — 429 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 1447ms · 70KB · €16/mo
www.rwth-aachen.de
Other
Costly
Execution 641ms
Transfer 20 KB
Monthly Cost €7/mo
www.rwth-aachen.de
Other
Costly
Execution 525ms
Transfer 49 KB
Unused 60%
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 281ms
Transfer 0 KB
Monthly Cost €3/mo

These scripts may cost more than they're worth

  • www.rwth-aachen.de adds 641ms and costs ~€7/month
  • www.rwth-aachen.de adds 525ms and costs ~€6/month
  • Unattributable adds 281ms 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.rwth-aachen.de takes 641ms 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

www.rwth-aachen.de takes 525ms 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

60% 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

Unattributable takes 281ms 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

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.

Send Feedback