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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
98
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.
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.

762 ms

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

958 ms

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

12 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

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

762 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.69 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
14
8 PASS 3 REVIEW 1 FIX
D
Third-Party Impact
Action
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (969.5 KiB of 1006.3 KiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
B
Image Optimization
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 218 KB
0 oversized -0 KB
15 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 Bundles
Action
21 scripts, 216 KB unused
REVIEW
21 scripts, 216 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...: 69 KB unused (40%)
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: 216 KB
216 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 KB69 KB (40%)✓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
1006 KB transferred, 56 requests
PASS
1006 KB transferred, 56 requests
Info::
Page weighs 2.4 MB (1006 KB transferred)
Warning::
JavaScript is 578 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 578 KB
Info::
56 HTTP requests
Info::
Estimated 0.21 g CO2 per page load
1006 KB / 2.4 MB budget
1006 KB transferred
56 requests
0.21 g CO2 per page load
JavaScript 578.2 KiB 57%
Images 217.5 KiB 22%
Fonts 131.2 KiB 13%
HTML 35.8 KiB 4%
CSS 31.5 KiB 3%
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+
JS Execution Cost
419ms total JS execution
PASS
419ms total JS execution
Info::
https://www.opera.com/: 117ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PRB...: 91ms CPU time
Info::
Unattributable: 90ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-T18E...: 64ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-979...: 57ms CPU time
Warning::
Third-party scripts: 301ms (72% of total)

Main Thread Breakdown

Script Evaluation 43% Other 24% Style & Layout 15% Script Parsing & Compilation 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.opera.com/117ms4ms1ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-PRBZ42F91ms74ms11ms3rd
Unattributable90ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-T18E1GTPQG&cx=c&gtm=4e648164ms47ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-979253717&cx=c&gtm=4e648157ms39ms13ms3rd
A+
Font Loading
5 fonts (131 KB)
PASS
5 fonts (131 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

131 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 FCP 762 ms LCP 958 mshttps://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/4fdfc1ed1fd6ef8b1684.add313694b12.woff24fdfc1ed1fd6ef8b1684.ad... https://cdn-production-opera-website.operacdn.com/staticfiles/4fdfc1ed1fd6ef8b1684.add313694b12.woff2 — 24.5 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
4fdfc1ed1fd6ef8b1684.ad... woff2 swap
Size 25 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
56 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
72% of JavaScript execution is third-party
First-party Third-party 301ms · 501KB · kr56/mo
Google Tag Manager
Tag Manager
Optional
Execution 91ms
Transfer 185 KB
Unused 45%
Monthly Cost kr17/mo
Unattributable
Other
Optional
Execution 90ms
Transfer 0 KB
Monthly Cost kr17/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 171 KB
Unused 40%
Monthly Cost kr12/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 145 KB
Unused 45%
Monthly Cost kr11/mo

72% 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

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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