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https://Diehl.com

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
8
PASS
7
INFO
3

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

Mobile Desktop
90
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.

1.11 s

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

1.75 s

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

4 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.

1.37 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.

1.75 s

Page Load Progression

386 ms
773 ms
1.2 s
1.5 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
22
7 PASS 8 REVIEW 4 FIX
F
Page Weight Budget
Action
11.0 MB transferred, 40 requests
FIX
11.0 MB transferred, 40 requests
Critical::
Page weighs 11.7 MB (11.0 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 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::
40 HTTP requests
Info::
Estimated 2.3 g CO2 per page load
11.0 MB / 2.4 MB budget
11.0 MB transferred
40 requests
2.3 g CO2 per page load
Other 8.5 MiB 77%
Images 1.8 MiB 16%
Fonts 282.0 KiB 3%
JavaScript 274.0 KiB 2%
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 (11.0 MiB of 11.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
40 resources · 11.0 MB · 190 KB savings available
FIX
40 resources · 11.0 MB · 190 KB savings available
Warning::
Page weight 11.0 MB exceeds 1 MB target by 10.0 MB
Got: 11.0 MB Expected: ≤ 1 MB
Info::
~190 KB of savings available
Warning::
39 third-party resources (100% of weight)
Info::
6 resources over 200KB
40 resources · 11.0 MiB · 39 third-party 10.0 MiB over 1MB target
Media 77% · 8.5 MiB
Image 17% · 1.8 MiB
Font 3% · 282.0 KiB
JavaScript 2% · 274.0 KiB
Document 1% · 83.0 KiB
CSS 0% · 50.7 KiB
Other 0% · 1.2 KiB

~189.8 KiB of savings available

Remove unused JavaScript: 189.8 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
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Info::
All images are well-optimized
16 images 1.8 MB
0 oversized -0 KB
16 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
594ms total JS execution
REVIEW
594ms total JS execution
Warning::
https://new.diehl.com/build/vendor.bf8f103d.js: 266ms CPU time
Info::
https://new.diehl.com/group/en/: 223ms CPU time
Info::
Unattributable: 105ms CPU time
Warning::
Third-party scripts: 490ms (82% of total)

Main Thread Breakdown

Style & Layout 35% Other 30% Script Evaluation 19% Rendering 10%
ScriptTotalScriptingParse/CompileParty
https://new.diehl.com/build/vendor.bf8f103d.js266ms94ms9ms3rd
https://new.diehl.com/group/en/223ms2ms0ms3rd
Unattributable105ms2ms0ms1st
C
JS Bundles
Action
7 scripts, 190 KB unused
REVIEW
7 scripts, 190 KB unused
Warning::
https://new.diehl.com/build/vendor.bf8f103d.js: 168 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 KB168 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 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.7 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 — 18 ms — font-display: swaphttps://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2ProximaNovaSemiBold.ebc... https://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2 — 82.5 KiB — 9 ms — font-display: swaphttps://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2ProximaNovaRegular.39ba... https://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2 — 81.6 KiB — 8 ms — font-display: swaphttps://new.diehl.com/build/PuristaSemiBold.06f43a15.woff2PuristaSemiBold.06f43a1... https://new.diehl.com/build/PuristaSemiBold.06f43a15.woff2 — 20.6 KiB — 4 ms — font-display: swaphttps://new.diehl.com/build/ProximaNovaBold.33f8ff79.woff2ProximaNovaBold.33f8ff7... https://new.diehl.com/build/ProximaNovaBold.33f8ff79.woff2 — 85.5 KiB — 4 ms — font-display: swap
x-font-ttf;charset=utf-... unknown swap
Size 12 KB
Load time 18 ms
Start 456 ms
Risk FOUT — text flashes from fallback to web font
ProximaNovaSemiBold.ebc... woff2 swap
Size 82 KB
Load time 9 ms
Start 474 ms
Risk FOUT — text flashes from fallback to web font
ProximaNovaRegular.39ba... woff2 swap
Size 82 KB
Load time 8 ms
Start 474 ms
Risk FOUT — text flashes from fallback to web font
PuristaSemiBold.06f43a1... woff2 swap
Size 21 KB
Load time 4 ms
Start 561 ms
Risk FOUT — text flashes from fallback to web font
ProximaNovaBold.33f8ff7... woff2 swap
Size 85 KB
Load time 4 ms
Start 567 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.
Network Waterfall
40 requests over 2285ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.7 shttps://diehl.com// https://diehl.com/ — 301 — 243 B — 95 ms — http/1.1https://www.diehl.com/www.diehl.com/ https://www.diehl.com/ — 301 — 200 B — 154 ms — h2https://www.diehl.com/group/www.diehl.com/group/ https://www.diehl.com/group/ — 302 — 67 B — 47 ms — h2https://www.diehl.com/group/en/www.diehl.com/group/en/ https://www.diehl.com/group/en/ — 302 — 224 B — 96 ms — h3https://new.diehl.com/group/en/new.diehl.com/group/en/ https://new.diehl.com/group/en/ — 200 — 82.3 KiB — 426 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 92 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 — 8 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 — 4 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 — 5 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 — 3 ms — h2https://new.diehl.com/build/main.9611bcc4.jsnew.diehl.com/build/main.9611bcc4.j... https://new.diehl.com/build/main.9611bcc4.js — 200 — 19.4 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 — 208.3 KiB — 11 ms — h2https://new.diehl.com/manifest.jsonnew.diehl.com/manifest.json https://new.diehl.com/manifest.json — 200 — 1.2 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 — 18 ms — datahttps://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2new.diehl.com/build/ProximaNovaSemi... https://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2 — 200 — 82.5 KiB — 9 ms — h2https://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2new.diehl.com/build/ProximaNovaRegu... https://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2 — 200 — 81.6 KiB — 8 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 — 66.0 KiB — 21 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 — 21 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 — 4.3 KiB — 11 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 — 4.2 KiB — 16 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 — 4.3 KiB — 19 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 — 4.0 KiB — 16 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 — 16.5 KiB — 19 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 — 23 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 — 23 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 — 24 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 — 92.1 KiB — 24 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 — 74.8 KiB — 22 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 — 68.6 KiB — 23 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 — 24 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.7 shttps://diehl.com// https://diehl.com/ — 301 — 243 B — 95 ms — http/1.1https://www.diehl.com/www.diehl.com/ https://www.diehl.com/ — 301 — 200 B — 154 ms — h2https://www.diehl.com/group/www.diehl.com/group/ https://www.diehl.com/group/ — 302 — 67 B — 47 ms — h2https://www.diehl.com/group/en/www.diehl.com/group/en/ https://www.diehl.com/group/en/ — 302 — 224 B — 96 ms — h3https://new.diehl.com/group/en/new.diehl.com/group/en/ https://new.diehl.com/group/en/ — 200 — 82.3 KiB — 426 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 92 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 — 8 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 — 4 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 — 5 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 — 3 ms — h2https://new.diehl.com/build/main.9611bcc4.jsnew.diehl.com/build/main.9611bcc4.j... https://new.diehl.com/build/main.9611bcc4.js — 200 — 19.4 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 — 208.3 KiB — 11 ms — h2https://new.diehl.com/manifest.jsonnew.diehl.com/manifest.json https://new.diehl.com/manifest.json — 200 — 1.2 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 — 18 ms — datahttps://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2new.diehl.com/build/ProximaNovaSemi... https://new.diehl.com/build/ProximaNovaSemiBold.ebcc077a.woff2 — 200 — 82.5 KiB — 9 ms — h2https://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2new.diehl.com/build/ProximaNovaRegu... https://new.diehl.com/build/ProximaNovaRegular.39ba3707.woff2 — 200 — 81.6 KiB — 8 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 — 66.0 KiB — 21 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
82% of JavaScript execution is third-party
First-party Third-party 490ms · 291KB · €7/mo
new.diehl.com
Other
Costly
Execution 266ms
Transfer 208 KB
Unused 81%
Monthly Cost €4/mo
new.diehl.com
Other
Costly
Execution 223ms
Transfer 82 KB
Monthly Cost €3/mo

These scripts may cost more than they're worth

  • new.diehl.com adds 266ms and costs ~€4/month
  • new.diehl.com adds 223ms and costs ~€3/month

82% 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 266ms 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 223ms 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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