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https://puretechleman.ch

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
0
REVIEW
5
PASS
8
INFO
2

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

Mobile Desktop
97
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.
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.

937 ms

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

937 ms

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.

0.000

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

1.09 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.

937 ms

Page Load Progression

579 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s
4.1 s
4.6 s
Checks
15
8 PASS 5 REVIEW
B
Third-Party Impact
53% third-party, 0 ms blocking
REVIEW
53% third-party, 0 ms blocking
Warning::
Third-party code accounts for 53% of page weight (213.9 KiB of 401.4 KiB)
Info::
Third-party blocking time is low (0 ms)
47%
53%
First-party Third-party
B
JS Execution Cost
668ms total JS execution
REVIEW
668ms total JS execution
Warning::
https://puretechleman.ch/assets/main-CFQN0IbE.js: 324ms CPU time
Info::
https://puretechleman.ch/: 179ms CPU time
Info::
Unattributable: 92ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0TSC...: 73ms CPU time
Info::
Third-party scripts: 165ms (25% of total)

Main Thread Breakdown

Other 47% Style & Layout 22% Script Evaluation 21% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://puretechleman.ch/assets/main-CFQN0IbE.js324ms71ms0ms1st
https://puretechleman.ch/179ms1ms1ms1st
Unattributable92ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0TSC8HDBTF73ms60ms11ms3rd
B
JS Bundles
3 scripts, 123 KB unused
REVIEW
3 scripts, 123 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0TSC...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://puretechleman.ch/assets/main-CFQN0IbE.js: 57 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 123 KB
123 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-0TSC8HDBTF157 KB65 KB (42%)✓3rd
https://puretechleman.ch/assets/main-CFQN0IbE.js145 KB57 KB (40%)✓1st
https://puretechleman.ch/~flock.js8 KB—✓1st

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

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

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache, must-revalidate, max-age=0
REVIEW
no-cache, must-revalidate, max-age=0
Info::
Cache-Control header is set
Got: no-cache, must-revalidate, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, must-revalidate, max-age=0

DirectiveValueMeaning
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
max-age0Cache for 0 seconds
A+
Page Weight Budget
401 KB transferred, 12 requests
PASS
401 KB transferred, 12 requests
Info::
Page weighs 1.2 MB (401 KB transferred)
Info::
12 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
401 KB / 2.4 MB budget
401 KB transferred
12 requests
0.08 g CO2 per page load
JavaScript 310.5 KiB 77%
Fonts 54.7 KiB 14%
CSS 18.8 KiB 5%
HTML 15.9 KiB 4%
Images 584 B 0%
Other 549 B 0%
Other 329 B 0%
Other 102 B 0%
0 2.4 MB 4.9 MB
Under budget
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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Warning::
https://puretechleman.ch/ptl-mark-white.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
1 images 1 KB
0 oversized -0 KB
1 legacy format
1 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

A+
Font Loading
2 fonts (55 KB)
PASS
2 fonts (55 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

55 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 937 ms LCP 937 mshttps://fonts.gstatic.com/s/jetbrainsmono/v24/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxDcwgknk-4.woff2tDbv2o-flEEny0FZhsfKu5W... https://fonts.gstatic.com/s/jetbrainsmono/v24/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxDcwgknk-4.woff2 — 30.6 KiB — 49 ms — font-display: swaphttps://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2xn7gYHE41ni1AdIRggexSvf... https://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2 — 24.0 KiB — 37 ms — font-display: swap
tDbv2o-flEEny0FZhsfKu5W... woff2 swap
Size 31 KB
Load time 49 ms
Start 622 ms
Risk FOUT — text flashes from fallback to web font
xn7gYHE41ni1AdIRggexSvf... woff2 swap
Size 24 KB
Load time 37 ms
Start 622 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
A
Page Weight Inventory
12 resources · 401 KB · 123 KB savings available
PASS
12 resources · 401 KB · 123 KB savings available
Info::
Within 1MB page-weight target
Got: 401 KB
Info::
~123 KB of savings available
Warning::
5 third-party resources (53% of weight)
12 resources · 401.4 KiB · 5 third-party Within 1MB page-weight target
JavaScript 77% · 310.5 KiB
Font 14% · 54.7 KiB
CSS 5% · 18.8 KiB
Document 4% · 15.9 KiB
Image 0% · 913 B
Other 0% · 651 B

~122.6 KiB of savings available

Remove unused JavaScript: 122.6 KiB
Network Waterfall
12 requests over 2335ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 937 ms LCP 937 mshttps://puretechleman.ch// https://puretechleman.ch/ — 200 — 15.9 KiB — 413 ms — h2https://puretechleman.ch/ptl-mark-white.svg/ptl-mark-white.svg https://puretechleman.ch/ptl-mark-white.svg — 200 — 584 B — 112 ms — h2https://www.googletagmanager.com/gtag/js?id=G-0TSC8HDBTFwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-0TSC8HDBTF — 200 — 157.3 KiB — 116 ms — h2https://puretechleman.ch/assets/main-CFQN0IbE.js/assets/main-CFQN0IbE.js https://puretechleman.ch/assets/main-CFQN0IbE.js — 200 — 145.1 KiB — 162 ms — h2https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&family=Manrope:wght@300;400;500;600;700;800&display=swapfonts.googleapis.com/css2?family=Je... https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&family=Manrope:wght@300;400;500;600;700;800&display=swap — 200 — 1.4 KiB — 75 ms — h2https://puretechleman.ch/assets/styles-COf--v6T.css/assets/styles-COf--v6T.css https://puretechleman.ch/assets/styles-COf--v6T.css — 200 — 17.3 KiB — 121 ms — h2https://puretechleman.ch/~flock.js/~flock.js https://puretechleman.ch/~flock.js — 200 — 8.2 KiB — 118 ms — h2https://fonts.gstatic.com/s/jetbrainsmono/v24/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxDcwgknk-4.woff2fonts.gstatic.com/s/jetbrainsmono/v... https://fonts.gstatic.com/s/jetbrainsmono/v24/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxDcwgknk-4.woff2 — 200 — 30.6 KiB — 49 ms — h3https://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2fonts.gstatic.com/s/manrope/v20/xn7... https://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2 — 200 — 24.0 KiB — 37 ms — h3https://puretechleman.ch/favicon.svg/favicon.svg https://puretechleman.ch/favicon.svg — 200 — 329 B — 108 ms — h2https://puretechleman.ch/~api/analytics/~api/analytics https://puretechleman.ch/~api/analytics — 200 — 102 B — 1.3 s — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-0TSC8HDBTF&gtm=45je6511v9251214526za200zd9251214526&_p=1777992789704&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&are=1&cid=1805546812.1777992791&frm=0&pscdl=denied&rcb=6&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.137%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~118289195&sid=1777992790&sct=1&seg=0&dl=https%3A%2F%2Fpuretechleman.ch%2F&dt=Pure%20Tech%20Leman%20%E2%80%94%20Digital%20Studio%20Geneva%20%7C%20Web%2C%20Automation%2C%20Strategy&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1375region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-0TSC8HDBTF&gtm=45je6511v9251214526za200zd9251214526&_p=1777992789704&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&are=1&cid=1805546812.1777992791&frm=0&pscdl=denied&rcb=6&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.137%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~118289195&sid=1777992790&sct=1&seg=0&dl=https%3A%2F%2Fpuretechleman.ch%2F&dt=Pure%20Tech%20Leman%20%E2%80%94%20Digital%20Studio%20Geneva%20%7C%20Web%2C%20Automation%2C%20Strategy&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1375 — 204 — 549 B — 67 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
25% of JavaScript execution is third-party
First-party Third-party 165ms · 157KB · CHF1/mo
Unattributable
Other
Optional
Execution 92ms
Transfer 0 KB
Monthly Cost CHF0/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 157 KB
Unused 42%
Monthly Cost CHF0/mo

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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