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https://thieme-connect.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
4
REVIEW
2
PASS
7
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.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.78 s

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

2.86 s

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

153 ms

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

0.005

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

1.78 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.

2.86 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
7 PASS 2 REVIEW 4 FIX
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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
6 scripts, 350 KB unused
FIX
6 scripts, 350 KB unused
Warning::
https://www.thieme.com/assets/index.c04d1b4b54cfc2...: 350 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 350 KB
350 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.thieme.com/assets/index.c04d1b4b54cfc2d5e799.js566 KB350 KB (62%)✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 KB—✓3rd
https://www.thieme.com/ot.js1 KB—✓3rd
https://www.thieme.com/js_snippets_head.js1 KB—✓3rd
https://www.thieme.com/assets/preloadDumps/8ca4a102e990c56b.3fbf2a1d29a92d65fbff.js14 KB—✓3rd
https://www.thieme.com/js_snippets_before_body_end.js1 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

D
Page Weight Inventory
Action
24 resources · 1.5 MB · 350 KB savings available
FIX
24 resources · 1.5 MB · 350 KB savings available
Warning::
Page weight 557 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~350 KB of savings available
Warning::
23 third-party resources (100% of weight)
Info::
2 resources over 200KB
24 resources · 1.5 MiB · 23 third-party 557.4 KiB over 1MB target
CSS 52% · 828.7 KiB
JavaScript 37% · 584.1 KiB
Font 8% · 120.1 KiB
Image 1% · 18.0 KiB
Other 1% · 15.5 KiB
Document 1% · 14.9 KiB

~350.3 KiB of savings available

Remove unused JavaScript: 350.3 KiB
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.

B
Page Weight Budget
1.5 MB transferred, 24 requests
REVIEW
1.5 MB transferred, 24 requests
Info::
Page weighs 3.9 MB (1.5 MB transferred)
Info::
CSS is 829 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 829 KB
Warning::
JavaScript is 584 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 584 KB
Info::
24 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
24 requests
0.32 g CO2 per page load
CSS 828.7 KiB 52%
JavaScript 584.1 KiB 37%
Fonts 120.1 KiB 8%
Other 19.5 KiB 1%
Other 15.5 KiB 1%
HTML 13.4 KiB 1%
Other 0 B 0%
Images 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

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+
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
343ms total JS execution
PASS
343ms total JS execution
Warning::
https://www.thieme.com/assets/index.c04d1b4b54cfc2...: 343ms CPU time
Warning::
Third-party scripts: 343ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Other 11% Script Parsing & Compilation 10% Style & Layout 6% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.thieme.com/assets/index.c04d1b4b54cfc2d5e799.js343ms293ms44ms3rd
A+
Font Loading
1 fonts (120 KB)
PASS
1 fonts (120 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

120 KB total

Render-blocking

0

of 1

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 1.8 s LCP 2.9 shttps://cdn.thieme.de/frontend-design-tokens/fonts/variable/ThiemeArgo2023_VF.woff2ThiemeArgo2023_VF.woff2 https://cdn.thieme.de/frontend-design-tokens/fonts/variable/ThiemeArgo2023_VF.woff2 — 120.1 KiB — 257 ms — font-display: swap
ThiemeArgo2023_VF.woff2 woff2 swap
Size 120 KB
Load time 257 ms
Start 529 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~60 KB and ~120 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
24 requests over 1073ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.8 s LCP 2.9 shttps://thieme-connect.com// https://thieme-connect.com/ — 302 — 483 B — 113 ms — http/1.1https://www.thieme.de/connect/enwww.thieme.de/connect/en https://www.thieme.de/connect/en — 301 — 537 B — 154 ms — http/1.1http://www.thieme.de/en/thieme-connect/home-3939.htmwww.thieme.de/en/thieme-connect/hom... http://www.thieme.de/en/thieme-connect/home-3939.htm — 307 — 0 B — 2 ms — http/1.1https://www.thieme.de/en/thieme-connect/home-3939.htmwww.thieme.de/en/thieme-connect/hom... https://www.thieme.de/en/thieme-connect/home-3939.htm — 301 — 525 B — 38 ms — http/1.1https://www.thieme.com/en-us/who-we-servewww.thieme.com/en-us/who-we-serve https://www.thieme.com/en-us/who-we-serve — 200 — 13.4 KiB — 63 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 61 ms — https://www.thieme.com/assets/index.2bb3562a5822b9ca51b4.csswww.thieme.com/assets/index.2bb3562... https://www.thieme.com/assets/index.2bb3562a5822b9ca51b4.css — 200 — 828.7 KiB — 96 ms — h2https://www.thieme.com/ot.jswww.thieme.com/ot.js https://www.thieme.com/ot.js — 200 — 1.4 KiB — 99 ms — h2https://www.thieme.com/js_snippets_head.jswww.thieme.com/js_snippets_head.js https://www.thieme.com/js_snippets_head.js — 200 — 1.4 KiB — 96 ms — h2https://www.thieme.com/assets/preloadDumps/8ca4a102e990c56b.3fbf2a1d29a92d65fbff.jswww.thieme.com/assets/preloadDumps/... https://www.thieme.com/assets/preloadDumps/8ca4a102e990c56b.3fbf2a1d29a92d65fbff.js — 200 — 13.6 KiB — 100 ms — h2https://www.thieme.com/js_snippets_before_body_end.jswww.thieme.com/js_snippets_before_b... https://www.thieme.com/js_snippets_before_body_end.js — 200 — 1.4 KiB — 97 ms — h2https://www.thieme.com/assets/index.c04d1b4b54cfc2d5e799.jswww.thieme.com/assets/index.c04d1b4... https://www.thieme.com/assets/index.c04d1b4b54cfc2d5e799.js — 200 — 566.4 KiB — 35 ms — h2data:image/svg+xml,%3Csvg width=%2726%27 height=%2732%27 viewBox=%270 0 32 32%27 fill=%27black%27 x…data:image/svg+xml,%3Csvg width=%27... data:image/svg+xml,%3Csvg width=%2726%27 height=%2732%27 viewBox=%270 0 32 32%27 fill=%27black%27 x… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg width=%2732%27 height=%2732%27 viewBox=%270 0 32 32%27 fill=%27none%27 xm…data:image/svg+xml,%3Csvg width=%27... data:image/svg+xml,%3Csvg width=%2732%27 height=%2732%27 viewBox=%270 0 32 32%27 fill=%27none%27 xm… — 200 — 0 B — 0 ms — datahttps://cdn.thieme.de/frontend-design-tokens/fonts/variable/ThiemeArgo2023_VF.woff2cdn.thieme.de/frontend-design-token... https://cdn.thieme.de/frontend-design-tokens/fonts/variable/ThiemeArgo2023_VF.woff2 — 200 — 120.1 KiB — 257 ms — http/1.1https://www.thieme.com/assets/favicon.e8aebe902725204e25c5a691312ff4ca.pngwww.thieme.com/assets/favicon.e8aeb... https://www.thieme.com/assets/favicon.e8aebe902725204e25c5a691312ff4ca.png — 200 — 18.0 KiB — 20 ms — h2https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/performapi.scrivito.com/tenants/9ca5761af4... https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/perform — 200 — 0 B — 37 ms — h2https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/performapi.scrivito.com/tenants/9ca5761af4... https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/perform — 200 — 0 B — 37 ms — h2https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/performapi.scrivito.com/tenants/9ca5761af4... https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/perform — 200 — 0 B — 37 ms — h2https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/performapi.scrivito.com/tenants/9ca5761af4... https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/perform — 200 — 0 B — 37 ms — h2https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/performapi.scrivito.com/tenants/9ca5761af4... https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/perform — 200 — 680 B — 41 ms — h2https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/performapi.scrivito.com/tenants/9ca5761af4... https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/perform — 200 — 6.4 KiB — 79 ms — h2https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/performapi.scrivito.com/tenants/9ca5761af4... https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/perform — 200 — 4.2 KiB — 113 ms — h2https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/performapi.scrivito.com/tenants/9ca5761af4... https://api.scrivito.com/tenants/9ca5761af4a1cf7bf49dd51537e8f4d1/perform — 200 — 4.2 KiB — 81 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 343ms · 566KB · €4/mo
www.thieme.com
Other
Costly
Execution 343ms
Transfer 566 KB
Unused 62%
Monthly Cost €4/mo

These scripts may cost more than they're worth

  • www.thieme.com adds 343ms and costs ~€4/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.thieme.com takes 343ms 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

62% of www.thieme.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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