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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

1.14 s

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

3.05 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.

0.036

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

1.97 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.

3.13 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
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
6.9 MB transferred, 34 requests
FIX
6.9 MB transferred, 34 requests
Critical::
Page weighs 6.8 MB (6.9 MB transferred)
Warning::
Images are 3.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.4 MB
Warning::
JavaScript is 2.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.8 MB
Info::
CSS is 323 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 323 KB
Info::
34 HTTP requests
Info::
Estimated 1.4 g CO2 per page load
6.9 MB / 2.4 MB budget
6.9 MB transferred
34 requests
1.4 g CO2 per page load
Images 3.4 MiB 50%
JavaScript 2.8 MiB 41%
CSS 323.1 KiB 5%
HTML 206.8 KiB 3%
Fonts 94.9 KiB 1%
Other 5.8 KiB 0%
Other 4.8 KiB 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (6.9 MiB of 6.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
5 scripts, 1.8 MB unused
FIX
5 scripts, 1.8 MB unused
Warning::
https://www.rki.de/SiteGlobals/Frontend/JavaScript...: 1.1 MB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rki.de/SiteGlobals/Frontend/JavaScript...: unminified — 492 KB could be saved
Warning::
https://www.rki.de/SiteGlobals/Frontend/JavaScript...: 553 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rki.de/SiteGlobals/Frontend/JavaScript...: unminified — 480 KB could be saved
Warning::
https://www.rki.de/SiteGlobals/Frontend/JavaScript...: 68 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rki.de/SiteGlobals/Frontend/JavaScript...: 42 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rki.de/SiteGlobals/Frontend/JavaScript...: 26 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.8 MB
1826 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_multimedia.js?v=11351 KB1138 KB (85%)✗3rd
https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/global.js?v=71225 KB553 KB (45%)✗3rd
https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_imagesourcelightbox.js?v=1120 KB68 KB (57%)✗3rd
https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_slideshow_dots.js?v=1118 KB42 KB (36%)✗3rd
https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_lightbox.js?v=160 KB26 KB (43%)✗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

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
34 resources · 6.9 MB · 1.8 MB savings available
FIX
34 resources · 6.9 MB · 1.8 MB savings available
Warning::
Page weight 5.9 MB over 1MB target
Got: 6.9 MB Expected: ≤ 1 MB
Info::
~1.8 MB of savings available
Warning::
33 third-party resources (100% of weight)
Info::
11 resources over 200KB
34 resources · 6.9 MiB · 33 third-party 5.9 MiB over 1MB target
Image 50% · 3.4 MiB
JavaScript 41% · 2.8 MiB
CSS 5% · 323.1 KiB
Document 3% · 209.5 KiB
Font 1% · 94.9 KiB
Other 0% · 4.3 KiB

~1.8 MiB of savings available

Remove unused JavaScript: 1.8 MiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://www.rki.de/SharedDocs/Bilder/Teaser/2026/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rki.de/SharedDocs/Bilder/Startseite/Th... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rki.de/SharedDocs/Bilder/Startseite/St... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rki.de/SharedDocs/Bilder/Institut_Vert... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rki.de/SharedDocs/Bilder/Institut_Vert... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rki.de/SiteGlobals/Frontend/Images/log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.rki.de/SharedDocs/Bilder/Institut_Vert... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 3.4 MB
0 oversized -0 KB
9 legacy format
7 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

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

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
JS Execution Cost
366ms total JS execution
PASS
366ms total JS execution
Info::
https://www.rki.de/DE/Home/home_node.html: 142ms CPU time
Info::
https://www.rki.de/SiteGlobals/Frontend/JavaScript...: 117ms CPU time
Info::
Unattributable: 107ms CPU time
Warning::
Third-party scripts: 366ms (100% of total)

Main Thread Breakdown

Other 30% Style & Layout 25% Script Evaluation 21% Script Parsing & Compilation 14% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.rki.de/DE/Home/home_node.html142ms1ms0ms3rd
https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/global.js?v=7117ms51ms26ms3rd
Unattributable107ms4ms0ms3rd
A+
Font Loading
4 fonts (95 KB)
PASS
4 fonts (95 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

95 KB total

Render-blocking

0

of 4

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 FCP 1.1 s LCP 3.0 shttps://www.rki.de/static/fonts/Lato/lato-italic.woff2lato-italic.woff2 https://www.rki.de/static/fonts/Lato/lato-italic.woff2 — 24.3 KiB — 35 ms — font-display: swaphttps://www.rki.de/static/fonts/Lato/lato-regular.woff2lato-regular.woff2 https://www.rki.de/static/fonts/Lato/lato-regular.woff2 — 23.4 KiB — 67 ms — font-display: swaphttps://www.rki.de/static/fonts/Lato/lato-700.woff2lato-700.woff2 https://www.rki.de/static/fonts/Lato/lato-700.woff2 — 22.9 KiB — 74 ms — font-display: swaphttps://www.rki.de/static/fonts/Lato/lato-700italic.woff2lato-700italic.woff2 https://www.rki.de/static/fonts/Lato/lato-700italic.woff2 — 24.3 KiB — 92 ms — font-display: swap
lato-italic.woff2 woff2 swap
Size 24 KB
Load time 35 ms
Start 515 ms
Risk FOUT — text flashes from fallback to web font
lato-regular.woff2 woff2 swap
Size 23 KB
Load time 67 ms
Start 519 ms
Risk FOUT — text flashes from fallback to web font
lato-700.woff2 woff2 swap
Size 23 KB
Load time 74 ms
Start 519 ms
Risk FOUT — text flashes from fallback to web font
lato-700italic.woff2 woff2 swap
Size 24 KB
Load time 92 ms
Start 519 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+
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
34 requests over 1191ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.0 shttps://rki.de// https://rki.de/ — 302 — 468 B — 99 ms — http/1.1https://www.rki.de/www.rki.de/ https://www.rki.de/ — 302 — 756 B — 104 ms — http/1.1https://www.rki.de/DE/Home/home_node.htmlwww.rki.de/DE/Home/home_node.html https://www.rki.de/DE/Home/home_node.html — 200 — 206.8 KiB — 125 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/_libs.css?v=3www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/_libs.css?v=3 — 200 — 86.5 KiB — 182 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/small.css?v=17www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/small.css?v=17 — 200 — 154.9 KiB — 184 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/medium.css?v=14www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/medium.css?v=14 — 200 — 25.8 KiB — 128 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/large.css?v=12www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/large.css?v=12 — 200 — 19.4 KiB — 129 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/xlarge.css?v=8www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/xlarge.css?v=8 — 200 — 6.2 KiB — 100 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/custom.css?v=42www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/custom.css?v=42 — 200 — 4.6 KiB — 120 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/addon_usability.css?v=5www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/addon_usability.css?v=5 — 200 — 14.0 KiB — 133 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/global.js?v=7www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/global.js?v=7 — 200 — 1.2 MiB — 368 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/logo.svg?__blob=normal&v=2www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/logo.svg?__blob=normal&v=2 — 200 — 11.4 KiB — 34 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Teaser/2026/2026-04-20_Impress.webp?__blob=normal&v=3www.rki.de/SharedDocs/Bilder/Teaser... https://www.rki.de/SharedDocs/Bilder/Teaser/2026/2026-04-20_Impress.webp?__blob=normal&v=3 — 200 — 211.8 KiB — 97 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Startseite/Thumbnail_Erklaerfilm.jpg?__blob=normal&v=3www.rki.de/SharedDocs/Bilder/Starts... https://www.rki.de/SharedDocs/Bilder/Startseite/Thumbnail_Erklaerfilm.jpg?__blob=normal&v=3 — 200 — 225.8 KiB — 100 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Startseite/Startseite_Karriere.jpg?__blob=normal&v=3www.rki.de/SharedDocs/Bilder/Starts... https://www.rki.de/SharedDocs/Bilder/Startseite/Startseite_Karriere.jpg?__blob=normal&v=3 — 200 — 259.7 KiB — 98 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Das_RKI.jpg?__blob=normal&v=2www.rki.de/SharedDocs/Bilder/Instit... https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Das_RKI.jpg?__blob=normal&v=2 — 200 — 294.1 KiB — 69 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Museum.png?__blob=normal&v=2www.rki.de/SharedDocs/Bilder/Instit... https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Museum.png?__blob=normal&v=2 — 200 — 503.4 KiB — 195 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Geschichte.jpg?__blob=normal&v=2www.rki.de/SharedDocs/Bilder/Instit... https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Geschichte.jpg?__blob=normal&v=2 — 200 — 201.9 KiB — 41 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/icons/sprite.svg?__blob=normal&v=2www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/icons/sprite.svg?__blob=normal&v=2 — 200 — 27.8 KiB — 36 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/stage.svg?__blob=normal&v=6www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/stage.svg?__blob=normal&v=6 — 200 — 892.6 KiB — 81 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/teaser.svg?__blob=normal&v=1www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/teaser.svg?__blob=normal&v=1 — 200 — 892.4 KiB — 99 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/addon_print.css?v=5www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/addon_print.css?v=5 — 200 — 11.5 KiB — 45 ms — http/1.1https://www.rki.de/static/fonts/Lato/lato-italic.woff2www.rki.de/static/fonts/Lato/lato-i... https://www.rki.de/static/fonts/Lato/lato-italic.woff2 — 200 — 24.3 KiB — 35 ms — http/1.1https://www.rki.de/static/fonts/Lato/lato-regular.woff2www.rki.de/static/fonts/Lato/lato-r... https://www.rki.de/static/fonts/Lato/lato-regular.woff2 — 200 — 23.4 KiB — 67 ms — http/1.1https://www.rki.de/static/fonts/Lato/lato-700.woff2www.rki.de/static/fonts/Lato/lato-7... https://www.rki.de/static/fonts/Lato/lato-700.woff2 — 200 — 22.9 KiB — 74 ms — http/1.1https://www.rki.de/static/fonts/Lato/lato-700italic.woff2www.rki.de/static/fonts/Lato/lato-7... https://www.rki.de/static/fonts/Lato/lato-700italic.woff2 — 200 — 24.3 KiB — 92 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_lightbox.js?v=1www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_lightbox.js?v=1 — 200 — 60.4 KiB — 35 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_imagesourcelightbox.js?v=1www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_imagesourcelightbox.js?v=1 — 200 — 119.7 KiB — 407 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_slideshow_dots.js?v=1www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_slideshow_dots.js?v=1 — 200 — 117.5 KiB — 42 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/favicon.ico?__blob=normal&v=1www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/favicon.ico?__blob=normal&v=1 — 200 — 1.7 KiB — 34 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.0 shttps://rki.de// https://rki.de/ — 302 — 468 B — 99 ms — http/1.1https://www.rki.de/www.rki.de/ https://www.rki.de/ — 302 — 756 B — 104 ms — http/1.1https://www.rki.de/DE/Home/home_node.htmlwww.rki.de/DE/Home/home_node.html https://www.rki.de/DE/Home/home_node.html — 200 — 206.8 KiB — 125 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/_libs.css?v=3www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/_libs.css?v=3 — 200 — 86.5 KiB — 182 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/small.css?v=17www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/small.css?v=17 — 200 — 154.9 KiB — 184 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/medium.css?v=14www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/medium.css?v=14 — 200 — 25.8 KiB — 128 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/large.css?v=12www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/large.css?v=12 — 200 — 19.4 KiB — 129 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/xlarge.css?v=8www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/xlarge.css?v=8 — 200 — 6.2 KiB — 100 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/custom.css?v=42www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/custom.css?v=42 — 200 — 4.6 KiB — 120 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/addon_usability.css?v=5www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/addon_usability.css?v=5 — 200 — 14.0 KiB — 133 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/global.js?v=7www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/global.js?v=7 — 200 — 1.2 MiB — 368 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/logo.svg?__blob=normal&v=2www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/logo.svg?__blob=normal&v=2 — 200 — 11.4 KiB — 34 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Teaser/2026/2026-04-20_Impress.webp?__blob=normal&v=3www.rki.de/SharedDocs/Bilder/Teaser... https://www.rki.de/SharedDocs/Bilder/Teaser/2026/2026-04-20_Impress.webp?__blob=normal&v=3 — 200 — 211.8 KiB — 97 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Startseite/Thumbnail_Erklaerfilm.jpg?__blob=normal&v=3www.rki.de/SharedDocs/Bilder/Starts... https://www.rki.de/SharedDocs/Bilder/Startseite/Thumbnail_Erklaerfilm.jpg?__blob=normal&v=3 — 200 — 225.8 KiB — 100 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Startseite/Startseite_Karriere.jpg?__blob=normal&v=3www.rki.de/SharedDocs/Bilder/Starts... https://www.rki.de/SharedDocs/Bilder/Startseite/Startseite_Karriere.jpg?__blob=normal&v=3 — 200 — 259.7 KiB — 98 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Das_RKI.jpg?__blob=normal&v=2www.rki.de/SharedDocs/Bilder/Instit... https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Das_RKI.jpg?__blob=normal&v=2 — 200 — 294.1 KiB — 69 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Museum.png?__blob=normal&v=2www.rki.de/SharedDocs/Bilder/Instit... https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Museum.png?__blob=normal&v=2 — 200 — 503.4 KiB — 195 ms — http/1.1https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Geschichte.jpg?__blob=normal&v=2www.rki.de/SharedDocs/Bilder/Instit... https://www.rki.de/SharedDocs/Bilder/Institut_Verteiler/Geschichte.jpg?__blob=normal&v=2 — 200 — 201.9 KiB — 41 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/icons/sprite.svg?__blob=normal&v=2www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/icons/sprite.svg?__blob=normal&v=2 — 200 — 27.8 KiB — 36 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/stage.svg?__blob=normal&v=6www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/stage.svg?__blob=normal&v=6 — 200 — 892.6 KiB — 81 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/teaser.svg?__blob=normal&v=1www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/teaser.svg?__blob=normal&v=1 — 200 — 892.4 KiB — 99 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Styles/addon_print.css?v=5www.rki.de/SiteGlobals/Frontend/Sty... https://www.rki.de/SiteGlobals/Frontend/Styles/addon_print.css?v=5 — 200 — 11.5 KiB — 45 ms — http/1.1https://www.rki.de/static/fonts/Lato/lato-italic.woff2www.rki.de/static/fonts/Lato/lato-i... https://www.rki.de/static/fonts/Lato/lato-italic.woff2 — 200 — 24.3 KiB — 35 ms — http/1.1https://www.rki.de/static/fonts/Lato/lato-regular.woff2www.rki.de/static/fonts/Lato/lato-r... https://www.rki.de/static/fonts/Lato/lato-regular.woff2 — 200 — 23.4 KiB — 67 ms — http/1.1https://www.rki.de/static/fonts/Lato/lato-700.woff2www.rki.de/static/fonts/Lato/lato-7... https://www.rki.de/static/fonts/Lato/lato-700.woff2 — 200 — 22.9 KiB — 74 ms — http/1.1https://www.rki.de/static/fonts/Lato/lato-700italic.woff2www.rki.de/static/fonts/Lato/lato-7... https://www.rki.de/static/fonts/Lato/lato-700italic.woff2 — 200 — 24.3 KiB — 92 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_lightbox.js?v=1www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_lightbox.js?v=1 — 200 — 60.4 KiB — 35 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_imagesourcelightbox.js?v=1www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_imagesourcelightbox.js?v=1 — 200 — 119.7 KiB — 407 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_slideshow_dots.js?v=1www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_slideshow_dots.js?v=1 — 200 — 117.5 KiB — 42 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/favicon.ico?__blob=normal&v=1www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/favicon.ico?__blob=normal&v=1 — 200 — 1.7 KiB — 34 ms — http/1.1https://www.rki.de/SiteGlobals/Modules/CookieBanner/DE/Allgemein/CookieBanner.html?view=renderCookieBannerExtendedwww.rki.de/SiteGlobals/Modules/Cook... https://www.rki.de/SiteGlobals/Modules/CookieBanner/DE/Allgemein/CookieBanner.html?view=renderCookieBannerExtended — 200 — 4.3 KiB — 35 ms — http/1.1https://www.rki.de/SharedDocs/Videos/DE/Erklaerfilm_RKI_DE_2023.html?view=renderLightboxwww.rki.de/SharedDocs/Videos/DE/Erk... https://www.rki.de/SharedDocs/Videos/DE/Erklaerfilm_RKI_DE_2023.html?view=renderLightbox — 200 — 1.5 KiB — 38 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/Images/favicon-32x32.png?__blob=normal&v=1www.rki.de/SiteGlobals/Frontend/Ima... https://www.rki.de/SiteGlobals/Frontend/Images/favicon-32x32.png?__blob=normal&v=1 — 200 — 1.9 KiB — 35 ms — http/1.1https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_multimedia.js?v=1www.rki.de/SiteGlobals/Frontend/Jav... https://www.rki.de/SiteGlobals/Frontend/JavaScript/init/bundle_multimedia.js?v=1 — 200 — 1.3 MiB — 152 ms — http/1.1
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 366ms · 1432KB · €5/mo
www.rki.de
Other
Optional
Execution 142ms
Transfer 207 KB
Monthly Cost €2/mo
www.rki.de
Other
Optional
Execution 117ms
Transfer 1225 KB
Unused 45%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 107ms
Transfer 0 KB
Monthly Cost €1/mo

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

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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