Performance
· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
8.72 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
17.56 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
414 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.
8.72 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.
17.85 s
Page Load Progression
FPage Weight BudgetAction3.1 MB transferred, 96 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
FJS Execution CostAction3943ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.oracles.ch/ | 870ms | 25ms | 6ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-VTWH5FDH1S | 699ms | 379ms | 57ms | 3rd |
| https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202609220101/show_ads_impl_fy2021.js?bust=122881196 | 696ms | 539ms | 52ms | 3rd |
| Unattributable | 515ms | 7ms | 0ms | 1st |
| https://fundingchoicesmessages.google.com/i/ca-pub-6364580711310936?href=https%3A%2F%2Fwww.oracles.ch&ers=2 | 302ms | 278ms | 18ms | 3rd |
| https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js | 273ms | 153ms | 97ms | 3rd |
| https://www.oracles.ch/assets/js/stars.js | 228ms | 45ms | 5ms | 1st |
| https://fundingchoicesmessages.google.com/f/AGSKWxXsmebZquhKGWqlh2VY7USlRWjwFVPaz8H8aOlUAgXg8Sq78EKnr2POmcUc_d7A5UbpN5ZLtHtir3HRhxU9P50JSzJoFUDZ2hJKxgG_-wcevCNeiNMz8z1MddH-OvxkchBpK4XPhw==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzkwMzY0OTQyLDgxODAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzcsOV0sbnVsbCwyLG51bGwsImVuIl0sImh0dHBzOi8vd3d3Lm9yYWNsZXMuY2gvIixudWxsLFtbOCwiMndTV2M4bHdzMDgiXSxbOSwiZW4tVVMiXSxbMTgsIltbW251bGwsMTM4MV1dXSJdLFszNSwiMTc5MDM2NDk0MiJdLFsxOSwiMiJdLFsxNywiWzBdIl0sWzI0LCIiXSxbMjksImZhbHNlIl1dXQ | 127ms | 38ms | 1ms | 3rd |
| https://fundingchoicesmessages.google.com/f/AGSKWxUkh0Ty2vVNntJv8Sy6gibM4j4YT_dM-ux6O4ghtP5ghnEjdbSom0kBaB2eF0BKVpbWU23A-qChcCa-Gw8amR53R9MQ_ZV59IF43bGIFxhm6JeRS_fPyNhAPvVq_gg35FLOHqLgDg==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzkwMzY0OTQzLDU3NjAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzcsOSw2XSxudWxsLDIsbnVsbCwiZW4iLG51bGwsbnVsbCxudWxsLG51bGwsbnVsbCwxXSwiaHR0cHM6Ly93d3cub3JhY2xlcy5jaC8iLG51bGwsW1s4LCIyd1NXYzhsd3MwOCJdLFs5LCJlbi1VUyJdLFsxOCwiW1tbbnVsbCwxMzgxXV1dIl0sWzM1LCIxNzkwMzY0OTQyIl0sWzE5LCIyIl0sWzE3LCJbMF0iXSxbMjQsIiJdLFsyOSwiZmFsc2UiXV1d | 69ms | 56ms | 4ms | 3rd |
| https://www.oracles.ch/assets/js/jquery.min.js | 58ms | 42ms | 13ms | 1st |
Showing top 10 of 12 scripts
DAsset CompressionAction2 of 3 asset hosts serve text uncompressedFIX
DPage Weight InventoryAction96 resources · 3.1 MB · 295 KB savings availableFIX
~295.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 96 resources | 3.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction29 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
Performance issues directly impact user engagement and conversion rates.
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS BundlesAction28 scripts, 295 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202609220101/show_ads_impl_fy2021.js?bust=122881196 | 163 KB | 102 KB (63%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VTWH5FDH1S | 173 KB | 72 KB (42%) | ✓ | 3rd |
| https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202609220101/reactive_library_fy2021.js?bust=122881196 | 73 KB | 59 KB (81%) | ✓ | 3rd |
| https://fundingchoicesmessages.google.com/i/ca-pub-6364580711310936?href=https%3A%2F%2Fwww.oracles.ch&ers=2 | 71 KB | 37 KB (52%) | ✓ | 3rd |
| https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js | 56 KB | 25 KB (45%) | ✓ | 3rd |
| https://tpc.googlesyndication.com/pagead/js/r20260924/r20110914/client/load_preloaded_resource_fy2021.js | 1 KB | — | ✓ | 3rd |
| https://tpc.googlesyndication.com/pagead/js/r20260924/r20110914/client/window_focus_fy2021.js | 1 KB | — | ✓ | 3rd |
| https://www.oracles.ch/assets/js/stars.js | 1 KB | — | ✓ | 1st |
| https://www.oracles.ch/assets/js/util.js | 3 KB | — | ✓ | 1st |
| https://www.oracles.ch/assets/js/breakpoints.min.js | 1 KB | — | ✓ | 1st |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BDocument CompressionDocument response uses gzip; brotli would be ~20% smallerREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
AThird-Party Impact30% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading8 fonts (247 KB)PASS
Web fonts
8
247 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
Network Waterfall96 requests over 3056msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 699ms | 173 KB | 42% | CHF11/mo | Costly |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 696ms | 163 KB | 63% | CHF11/mo | Costly |
fundingchoicesmessages.google.com fundingchoicesmessages.google.com | Other | 302ms | 71 KB | 52% | CHF5/mo | Costly |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 273ms | 56 KB | 45% | CHF4/mo | Costly |
fundingchoicesmessages.google.com fundingchoicesmessages.google.com | Other | 127ms | 4 KB | — | CHF2/mo | Optional |
fundingchoicesmessages.google.com fundingchoicesmessages.google.com | Other | 69ms | 2 KB | — | CHF1/mo | Optional |
ep2.adtrafficquality.google ep2.adtrafficquality.google | Other | 55ms | 8 KB | — | CHF1/mo | Optional |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 52ms | 73 KB | 81% | CHF1/mo | Optional |
These scripts may cost more than they're worth
- Google Tag Manager adds 699ms and costs ~CHF11/month
- pagead2.googlesyndication.com adds 696ms and costs ~CHF11/month
- fundingchoicesmessages.google.com adds 302ms and costs ~CHF5/month
- pagead2.googlesyndication.com adds 273ms and costs ~CHF4/month
58% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
Google Tag Manager takes 699ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
pagead2.googlesyndication.com takes 696ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
63% of pagead2.googlesyndication.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
fundingchoicesmessages.google.com takes 302ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
52% of fundingchoicesmessages.google.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
pagead2.googlesyndication.com takes 273ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
81% of pagead2.googlesyndication.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-08-27 — 2026-09-23)
LCP (p75)
1702 ms
85% good
INP (p75)
240 ms
68% good
CLS (p75)
0.280
67% good
FCP (p75)
1145 ms
TTFB (p75)
486 ms
Image Optimization23 images, 1953 KB total, 1398 KB wastedINFO
Image Optimization Audit
Total Images
23
Total Size
1953 KB
Oversized
11
Wasted
1398 KB