Skip to content
https://www.opera.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
4
PASS
9
INFO
2

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

Mobile Desktop
70
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

2.40 s

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

3.83 s

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

621 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.

2.40 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.

7.42 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 s
Checks
16
9 PASS 4 REVIEW 1 FIX
D
Third-Party Impact
Action
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (951.2 KiB of 976.0 KiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
B
Image Optimization
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 222 KB
0 oversized -0 KB
18 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

C
JS Execution Cost
Action
1932ms total JS execution
REVIEW
1932ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PRB...: 450ms CPU time
Warning::
Unattributable: 386ms CPU time
Warning::
https://www.opera.com/: 368ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T18E...: 333ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-979...: 234ms CPU time
Warning::
Third-party scripts: 1564ms (81% of total)

Main Thread Breakdown

Script Evaluation 49% Other 23% Style & Layout 10% Script Parsing & Compilation 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-PRBZ42F450ms365ms54ms3rd
Unattributable386ms8ms0ms3rd
https://www.opera.com/368ms15ms3ms1st
https://www.googletagmanager.com/gtag/js?id=G-T18E1GTPQG&cx=c&gtm=4e6481333ms257ms54ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-979253717&cx=c&gtm=4e6481234ms173ms53ms3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/traffic.fa1e9a35091f.js99ms75ms8ms3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/mainHomepage.536f7d9ecacc.js62ms52ms1ms3rd
C
JS Bundles
Action
22 scripts, 215 KB unused
REVIEW
22 scripts, 215 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PRB...: 82 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T18E...: 67 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-979...: 65 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 215 KB
215 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PRBZ42F185 KB82 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-T18E1GTPQG&cx=c&gtm=4e6481171 KB67 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-979253717&cx=c&gtm=4e6481145 KB65 KB (45%)✓3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/3578.js1 KB—✓3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/3675.js2 KB—✓3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/6139.js3 KB—✓3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/2291.js1 KB—✓3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/6353.js4 KB—✓3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/9523.js7 KB—✓3rd
https://cdn-production-opera-website.operacdn.com/staticfiles/1819.js3 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

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

A
Page Weight Budget
976 KB transferred, 59 requests
PASS
976 KB transferred, 59 requests
Info::
Page weighs 2.4 MB (976 KB transferred)
Warning::
JavaScript is 580 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 580 KB
Info::
59 HTTP requests
Info::
Estimated 0.20 g CO2 per page load
976 KB / 2.4 MB budget
976 KB transferred
59 requests
0.20 g CO2 per page load
JavaScript 579.9 KiB 59%
Images 222.0 KiB 23%
Fonts 106.7 KiB 11%
CSS 31.5 KiB 3%
HTML 23.7 KiB 2%
Other 10.5 KiB 1%
Other 1010 B 0%
Other 569 B 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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
4 fonts (107 KB)
PASS
4 fonts (107 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

107 KB total

Render-blocking

0

of 4

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 FCP 2.4 s LCP 3.8 shttps://cdn-production-opera-website.operacdn.com/staticfiles/b21a8376d942833de6fc.91f7ad7162e8.woff2b21a8376d942833de6fc.91... https://cdn-production-opera-website.operacdn.com/staticfiles/b21a8376d942833de6fc.91f7ad7162e8.woff2 — 26.2 KiB — 0 ms — font-display: swaphttps://cdn-production-opera-website.operacdn.com/staticfiles/067e5dad13c9184c2ba1.c0d25ced7cb5.woff2067e5dad13c9184c2ba1.c0... https://cdn-production-opera-website.operacdn.com/staticfiles/067e5dad13c9184c2ba1.c0d25ced7cb5.woff2 — 27.9 KiB — 0 ms — font-display: swaphttps://cdn-production-opera-website.operacdn.com/staticfiles/b606148c8e6ddb775208.43881a474ab8.woff2b606148c8e6ddb775208.43... https://cdn-production-opera-website.operacdn.com/staticfiles/b606148c8e6ddb775208.43881a474ab8.woff2 — 24.0 KiB — 0 ms — font-display: swaphttps://cdn-production-opera-website.operacdn.com/staticfiles/1da861906eae74cef5c2.6eaba6c08ad3.woff21da861906eae74cef5c2.6e... https://cdn-production-opera-website.operacdn.com/staticfiles/1da861906eae74cef5c2.6eaba6c08ad3.woff2 — 28.6 KiB — 0 ms — font-display: swap
b21a8376d942833de6fc.91... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
067e5dad13c9184c2ba1.c0... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
b606148c8e6ddb775208.43... woff2 swap
Size 24 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
1da861906eae74cef5c2.6e... woff2 swap
Size 29 KB
Load time 0 ms
Start 0 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
26 hints, 0 missing preconnects
PASS
26 hints, 0 missing preconnects
Info::
Page uses 26 resource hint(s)

Current Resource Hints

preconnect
5
preload
+6
16
dns-prefetch
5
prefetch
—

26 resource hints configured

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
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
59 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
81% of JavaScript execution is third-party
First-party Third-party 1564ms · 529KB · kr291/mo
Google Tag Manager
Tag Manager
Costly
Execution 450ms
Transfer 185 KB
Unused 45%
Monthly Cost kr84/mo
Unattributable
Other
Costly
Execution 386ms
Transfer 0 KB
Monthly Cost kr72/mo
Google Tag Manager
Tag Manager
Costly
Execution 333ms
Transfer 171 KB
Unused 39%
Monthly Cost kr62/mo
Google Tag Manager
Tag Manager
Costly
Execution 234ms
Transfer 145 KB
Unused 45%
Monthly Cost kr43/mo
cdn-production-opera-website.operacdn.com
Other
Optional
Execution 99ms
Transfer 24 KB
Monthly Cost kr18/mo
cdn-production-opera-website.operacdn.com
Other
Optional
Execution 62ms
Transfer 4 KB
Monthly Cost kr12/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 450ms and costs ~kr84/month
  • Unattributable adds 386ms and costs ~kr72/month
  • Google Tag Manager adds 333ms and costs ~kr62/month
  • Google Tag Manager adds 234ms and costs ~kr43/month

81% 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

Google Tag Manager takes 450ms 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

Unattributable takes 386ms 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

Google Tag Manager takes 333ms 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

Google Tag Manager takes 234ms 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

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback