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https://Diehl.com

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
8
PASS
11
INFO
3

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

Mobile Desktop
65
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

3.50 s

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

7.97 s

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

151 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.

4.03 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.

8.04 s

Page Load Progression

424 ms
849 ms
1.3 s
1.7 s
2.1 s
2.5 s
3.0 s
3.4 s
Checks
26
11 PASS 8 REVIEW 4 FIX
F
Page Weight Budget
Action
9.9 MB transferred, 39 requests
FIX
9.9 MB transferred, 39 requests
Critical::
Page weighs 10.8 MB (9.9 MB transferred)
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Info::
Fonts are 282 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 282 KB
Info::
39 HTTP requests
Info::
Estimated 2.1 g CO2 per page load
9.9 MB / 2.4 MB budget
9.9 MB transferred
39 requests
2.1 g CO2 per page load
Other 8.2 MiB 83%
Images 1.0 MiB 11%
Fonts 282.0 KiB 3%
JavaScript 274.0 KiB 3%
HTML 82.3 KiB 1%
CSS 50.7 KiB 0%
Other 20.6 KiB 0%
Other 1.2 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

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 (9.9 MiB of 9.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
39 resources · 9.9 MB · 190 KB savings available
FIX
39 resources · 9.9 MB · 190 KB savings available
Warning::
Page weight 9.9 MB exceeds 1 MB target by 8.9 MB
Got: 9.9 MB Expected: ≤ 1 MB
Info::
~190 KB of savings available
Warning::
38 third-party resources (100% of weight)
Info::
3 resources over 200KB
39 resources · 9.9 MiB · 38 third-party 8.9 MiB over 1MB target
Media 83% · 8.2 MiB
Image 11% · 1.1 MiB
Font 3% · 282.0 KiB
JavaScript 3% · 274.0 KiB
Document 1% · 83.0 KiB
CSS 0% · 50.7 KiB
Other 0% · 1.2 KiB

~190.5 KiB of savings available

Remove unused JavaScript: 190.5 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
Image Optimization
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Info::
All images are well-optimized
15 images 1.0 MB
0 oversized -0 KB
15 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1978ms total JS execution
REVIEW
1978ms total JS execution
Warning::
https://new.diehl.com/build/vendor.bf8f103d.js: 938ms CPU time
Warning::
https://new.diehl.com/group/en/: 590ms CPU time
Warning::
Unattributable: 450ms CPU time
Warning::
Third-party scripts: 1528ms (77% of total)

Main Thread Breakdown

Other 39% Style & Layout 35% Script Evaluation 17% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://new.diehl.com/build/vendor.bf8f103d.js938ms270ms37ms3rd
https://new.diehl.com/group/en/590ms10ms0ms3rd
Unattributable450ms8ms0ms1st
C
JS Bundles
Action
7 scripts, 190 KB unused
REVIEW
7 scripts, 190 KB unused
Warning::
https://new.diehl.com/build/vendor.bf8f103d.js: 169 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://analytics.diehl.com/js/container_44dHNPNt....: 22 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 190 KB
190 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://new.diehl.com/build/vendor.bf8f103d.js208 KB169 KB (81%)✓3rd
https://analytics.diehl.com/js/container_44dHNPNt.js35 KB22 KB (64%)✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 KB—✓3rd
https://new.diehl.com/build/lazysizes.7b57c75b.js9 KB—✓3rd
https://new.diehl.com/build/cookieConsentTagManager.9fe57421.js2 KB—✓3rd
https://new.diehl.com/build/runtime.928978ff.js1 KB—✓3rd
https://new.diehl.com/build/main.9611bcc4.js19 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
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+
Font Loading
5 fonts (282 KB)
PASS
5 fonts (282 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

282 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.5 s LCP 8.0 sdata:application/x-font-ttf;charset=utf-8;base64,AAEAAAALAIAAAwAwT1MvMg8SBkwAAAC8AAAAYGNtYXAXVtK0AA…x-font-ttf;charset=utf-... data:application/x-font-ttf;charset=utf-8;base64,AAEAAAALAIAAAwAwT1MvMg8SBkwAAAC8AAAAYGNtYXAXVtK0AA… — 11.9 KiB — 17 ms — font-display: swaphttps://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2ProximaNovaRegular.39ba... https://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2 — 81.6 KiB — 39 ms — font-display: swaphttps://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2ProximaNovaSemiBold.ebc... https://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2 — 82.4 KiB — 39 ms — font-display: swaphttps://new.diehl.com/build/PuristaSemiBold.06f43a15.woff2PuristaSemiBold.06f43a1... https://new.diehl.com/build/PuristaSemiBold.06f43a15.woff2 — 20.6 KiB — 3 ms — font-display: swaphttps://new.diehl.com/build/ProximaNovaBold.33f8ff79.woff2ProximaNovaBold.33f8ff7... https://new.diehl.com/build/ProximaNovaBold.33f8ff79.woff2 — 85.5 KiB — 17 ms — font-display: swap
x-font-ttf;charset=utf-... unknown swap
Size 12 KB
Load time 17 ms
Start 482 ms
Risk FOUT — text flashes from fallback to web font
ProximaNovaRegular.39ba... woff2 swap
Size 82 KB
Load time 39 ms
Start 499 ms
Risk FOUT — text flashes from fallback to web font
ProximaNovaSemiBold.ebc... woff2 swap
Size 82 KB
Load time 39 ms
Start 500 ms
Risk FOUT — text flashes from fallback to web font
PuristaSemiBold.06f43a1... woff2 swap
Size 21 KB
Load time 3 ms
Start 561 ms
Risk FOUT — text flashes from fallback to web font
ProximaNovaBold.33f8ff7... woff2 swap
Size 85 KB
Load time 17 ms
Start 564 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)

Fixing the unchecked items could save ~4 KB and ~8 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
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
A
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
2 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall
39 requests over 1193ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.5 s LCP 8.0 shttps://diehl.com// https://diehl.com/ — 301 — 243 B — 129 ms — http/1.1https://www.diehl.com/www.diehl.com/ https://www.diehl.com/ — 301 — 200 B — 133 ms — h2https://www.diehl.com/group/www.diehl.com/group/ https://www.diehl.com/group/ — 302 — 67 B — 45 ms — h2https://www.diehl.com/group/en/www.diehl.com/group/en/ https://www.diehl.com/group/en/ — 302 — 224 B — 82 ms — h3https://new.diehl.com/group/en/new.diehl.com/group/en/ https://new.diehl.com/group/en/ — 200 — 82.3 KiB — 390 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 129 ms — https://new.diehl.com/build/main.3f4bd2ec.cssnew.diehl.com/build/main.3f4bd2ec.c... https://new.diehl.com/build/main.3f4bd2ec.css — 200 — 50.7 KiB — 18 ms — h2https://new.diehl.com/build/lazysizes.7b57c75b.jsnew.diehl.com/build/lazysizes.7b57c... https://new.diehl.com/build/lazysizes.7b57c75b.js — 200 — 8.9 KiB — 11 ms — h2https://new.diehl.com/build/cookieConsentTagManager.9fe57421.jsnew.diehl.com/build/cookieConsentTa... https://new.diehl.com/build/cookieConsentTagManager.9fe57421.js — 200 — 1.7 KiB — 15 ms — h2https://new.diehl.com/manifest.jsonnew.diehl.com/manifest.json https://new.diehl.com/manifest.json — 200 — 1.2 KiB — 37 ms — h2https://new.diehl.com/build/runtime.928978ff.jsnew.diehl.com/build/runtime.928978f... https://new.diehl.com/build/runtime.928978ff.js — 200 — 1.0 KiB — 4 ms — h2https://new.diehl.com/build/main.9611bcc4.jsnew.diehl.com/build/main.9611bcc4.j... https://new.diehl.com/build/main.9611bcc4.js — 200 — 19.5 KiB — 8 ms — h2https://new.diehl.com/build/vendor.bf8f103d.jsnew.diehl.com/build/vendor.bf8f103d... https://new.diehl.com/build/vendor.bf8f103d.js — 200 — 208.2 KiB — 11 ms — h2data:application/x-font-ttf;charset=utf-8;base64,AAEAAAALAIAAAwAwT1MvMg8SBkwAAAC8AAAAYGNtYXAXVtK0AA…data:application/x-font-ttf;charset... data:application/x-font-ttf;charset=utf-8;base64,AAEAAAALAIAAAwAwT1MvMg8SBkwAAAC8AAAAYGNtYXAXVtK0AA… — 200 — 11.9 KiB — 17 ms — datahttps://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2new.diehl.com/build/ProximaNovaRegu... https://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2 — 200 — 81.6 KiB — 39 ms — h2https://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2new.diehl.com/build/ProximaNovaSemi... https://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2 — 200 — 82.4 KiB — 39 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/400px/4/0/6/4/24604-1-eng-GB/4591246a327f-Diehl_Video_Loading-Screen.jpgnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/400px/4/0/6/4/24604-1-eng-GB/4591246a327f-Diehl_Video_Loading-Screen.jpg — 200 — 65.9 KiB — 68 ms — h2https://new.diehl.com/var/site/storage/images/4/0/6/4/24604-1-eng-GB/4591246a327f-Diehl_Video_Loading-Screen.jpgnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/4/0/6/4/24604-1-eng-GB/4591246a327f-Diehl_Video_Loading-Screen.jpg — 200 — 181.6 KiB — 85 ms — h2https://new.diehl.com/group/en/asset/download/898/file/Icon_Beschaeftigtenew.diehl.com/group/en/asset/downlo... https://new.diehl.com/group/en/asset/download/898/file/Icon_Beschaeftigte — 200 — 4.4 KiB — 47 ms — h2https://new.diehl.com/group/en/asset/download/899/file/Umsatznew.diehl.com/group/en/asset/downlo... https://new.diehl.com/group/en/asset/download/899/file/Umsatz — 200 — 4.1 KiB — 38 ms — h2https://new.diehl.com/group/en/asset/download/897/file/FundEnew.diehl.com/group/en/asset/downlo... https://new.diehl.com/group/en/asset/download/897/file/FundE — 200 — 4.4 KiB — 43 ms — h2https://new.diehl.com/group/en/asset/download/900/file/Unternehmensgeschichtenew.diehl.com/group/en/asset/downlo... https://new.diehl.com/group/en/asset/download/900/file/Unternehmensgeschichte — 200 — 4.2 KiB — 43 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/200px/2/6/1/2/22162-1-ger-DE/4c46a21553b7-AdobeStock_1079762019.jpegnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/200px/2/6/1/2/22162-1-ger-DE/4c46a21553b7-AdobeStock_1079762019.jpeg — 200 — 16.6 KiB — 75 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/400px/9/0/7/9/449709-1-ger-DE/51880fc09f27-pm_ziesel_v.jpgnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/400px/9/0/7/9/449709-1-ger-DE/51880fc09f27-pm_ziesel_v.jpg — 200 — 133.7 KiB — 83 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/400px/3/7/6/8/448673-1-ger-DE/1b09a1462963-2026_05_08_pm_mou_hds_verteilerbild.jpgnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/400px/3/7/6/8/448673-1-ger-DE/1b09a1462963-2026_05_08_pm_mou_hds_verteilerbild.jpg — 200 — 56.2 KiB — 92 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/400px/8/6/6/6/446668-1-ger-DE/24b7c834b331-diehl-metering_gaia_2025_smart-metering-et-reduction-des-pertes-deau-1-.jpgnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/400px/8/6/6/6/446668-1-ger-DE/24b7c834b331-diehl-metering_gaia_2025_smart-metering-et-reduction-des-pertes-deau-1-.jpg — 200 — 98.0 KiB — 95 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/400px/1/0/1/5/445101-1-ger-DE/2b4e72947c77-202604_ifat_meet-the-experts_diehl-metering_news_distri-page-pic_2x1.pngnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/400px/1/0/1/5/445101-1-ger-DE/2b4e72947c77-202604_ifat_meet-the-experts_diehl-metering_news_distri-page-pic_2x1.png — 200 — 92.0 KiB — 94 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/400px/3/9/5/2/2593-1-eng-GB/bbd1993ac7ce-VBW_DAQ_Kicker.jpgnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/400px/3/9/5/2/2593-1-eng-GB/bbd1993ac7ce-VBW_DAQ_Kicker.jpg — 200 — 74.7 KiB — 79 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/400px/5/7/2/2/22275-1-ger-DE/a3aed49c6feb-Website_Stephanstrasse_2025_Shooting4von5-HG1T_2591.jpgnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/400px/5/7/2/2/22275-1-ger-DE/a3aed49c6feb-Website_Stephanstrasse_2025_Shooting4von5-HG1T_2591.jpg — 200 — 68.7 KiB — 65 ms — h2https://new.diehl.com/var/site/storage/images/_aliases/400px/8/7/8/5/25878-1-ger-DE/e461698b3c37-VB_Ventures_fotografie-christian-horn_de-HG1T_8994.jpgnew.diehl.com/var/site/storage/imag... https://new.diehl.com/var/site/storage/images/_aliases/400px/8/7/8/5/25878-1-ger-DE/e461698b3c37-VB_Ventures_fotografie-christian-horn_de-HG1T_8994.jpg — 200 — 70.2 KiB — 88 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.5 s LCP 8.0 shttps://diehl.com// https://diehl.com/ — 301 — 243 B — 129 ms — http/1.1https://www.diehl.com/www.diehl.com/ https://www.diehl.com/ — 301 — 200 B — 133 ms — h2https://www.diehl.com/group/www.diehl.com/group/ https://www.diehl.com/group/ — 302 — 67 B — 45 ms — h2https://www.diehl.com/group/en/www.diehl.com/group/en/ https://www.diehl.com/group/en/ — 302 — 224 B — 82 ms — h3https://new.diehl.com/group/en/new.diehl.com/group/en/ https://new.diehl.com/group/en/ — 200 — 82.3 KiB — 390 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 129 ms — https://new.diehl.com/build/main.3f4bd2ec.cssnew.diehl.com/build/main.3f4bd2ec.c... https://new.diehl.com/build/main.3f4bd2ec.css — 200 — 50.7 KiB — 18 ms — h2https://new.diehl.com/build/lazysizes.7b57c75b.jsnew.diehl.com/build/lazysizes.7b57c... https://new.diehl.com/build/lazysizes.7b57c75b.js — 200 — 8.9 KiB — 11 ms — h2https://new.diehl.com/build/cookieConsentTagManager.9fe57421.jsnew.diehl.com/build/cookieConsentTa... https://new.diehl.com/build/cookieConsentTagManager.9fe57421.js — 200 — 1.7 KiB — 15 ms — h2https://new.diehl.com/manifest.jsonnew.diehl.com/manifest.json https://new.diehl.com/manifest.json — 200 — 1.2 KiB — 37 ms — h2https://new.diehl.com/build/runtime.928978ff.jsnew.diehl.com/build/runtime.928978f... https://new.diehl.com/build/runtime.928978ff.js — 200 — 1.0 KiB — 4 ms — h2https://new.diehl.com/build/main.9611bcc4.jsnew.diehl.com/build/main.9611bcc4.j... https://new.diehl.com/build/main.9611bcc4.js — 200 — 19.5 KiB — 8 ms — h2https://new.diehl.com/build/vendor.bf8f103d.jsnew.diehl.com/build/vendor.bf8f103d... https://new.diehl.com/build/vendor.bf8f103d.js — 200 — 208.2 KiB — 11 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
77% of JavaScript execution is third-party
First-party Third-party 1528ms · 291KB · €21/mo
new.diehl.com
Other
Costly
Execution 938ms
Transfer 208 KB
Unused 81%
Monthly Cost €13/mo
new.diehl.com
Other
Costly
Execution 590ms
Transfer 82 KB
Monthly Cost €8/mo

These scripts may cost more than they're worth

  • new.diehl.com adds 938ms and costs ~€13/month
  • new.diehl.com adds 590ms and costs ~€8/month

77% 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

new.diehl.com takes 938ms 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

81% of new.diehl.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

new.diehl.com takes 590ms 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

Image Optimization
13 images, 808 KB total, 5 KB wasted
INFO

Image Optimization Audit

Total Images

13

Total Size

808 KB

Oversized

4

Wasted

5 KB

13 missing dimensions 12 missing lazy loading
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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