Performance
· 17 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.
3.47 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.72 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
520 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.023
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.47 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.
8.02 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 sDThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization19 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
CJS Execution CostAction1849ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.opera.com/ | 434ms | 15ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PRBZ42F | 380ms | 290ms | 53ms | 3rd |
| Unattributable | 370ms | 6ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-T18E1GTPQG&cx=c>m=4e64f0 | 305ms | 241ms | 46ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-979253717&cx=c>m=4e64f0 | 231ms | 180ms | 41ms | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/traffic.fa1e9a35091f.js | 71ms | 51ms | 5ms | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/mainHomepage.536f7d9ecacc.js | 59ms | 50ms | 1ms | 3rd |
CJS BundlesAction22 scripts, 216 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-PRBZ42F | 186 KB | 82 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-T18E1GTPQG&cx=c>m=4e64f0 | 172 KB | 69 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-979253717&cx=c>m=4e64f0 | 145 KB | 65 KB (45%) | ✓ | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/3578.js | 1 KB | — | ✓ | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/3675.js | 2 KB | — | ✓ | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/6139.js | 3 KB | — | ✓ | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/2291.js | 1 KB | — | ✓ | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/6353.js | 4 KB | — | ✓ | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/9523.js | 7 KB | — | ✓ | 3rd |
| https://cdn-production-opera-website.operacdn.com/staticfiles/1819.js | 3 KB | — | ✓ | 3rd |
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
BPage Weight Inventory60 resources · 1014 KB · 216 KB savings availableREVIEW
~215.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 60 resources | 1014.3 KiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
APage Weight Budget1014 KB transferred, 60 requestsPASS
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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (107 KB)PASS
Web fonts
4
107 KB total
Render-blocking
0
of 4
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 Hints26 hints, 0 missing preconnectsPASS
Current Resource Hints
26 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall60 requests over 989msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.opera.com www.opera.com | Other | 434ms | 24 KB | — | kr81/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 380ms | 186 KB | 44% | kr71/mo | Costly |
Unattributable Unattributable | Other | 370ms | 0 KB | — | kr69/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 305ms | 172 KB | 40% | kr57/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 231ms | 145 KB | 45% | kr43/mo | Costly |
cdn-production-opera-website.operacdn.com cdn-production-opera-website.operacdn.com | Other | 71ms | 24 KB | — | kr13/mo | Optional |
cdn-production-opera-website.operacdn.com cdn-production-opera-website.operacdn.com | Other | 59ms | 4 KB | — | kr11/mo | Optional |
These scripts may cost more than they're worth
- www.opera.com adds 434ms and costs ~kr81/month
- Google Tag Manager adds 380ms and costs ~kr71/month
- Unattributable adds 370ms and costs ~kr69/month
- Google Tag Manager adds 305ms and costs ~kr57/month
- Google Tag Manager adds 231ms and costs ~kr43/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.opera.com takes 434ms 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
Google Tag Manager takes 380ms 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
Unattributable takes 370ms 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
Google Tag Manager takes 305ms 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
Google Tag Manager takes 231ms 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