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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
88
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

2.64 s

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

3.22 s

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

82 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.

3.05 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.

6.28 s

Page Load Progression

536 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.8 s
4.3 s
Checks
17
10 PASS 3 REVIEW 2 FIX
D
JS Bundles
Action
8 scripts, 191 KB unused
FIX
8 scripts, 191 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-W280...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WQX...: 64 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://se.net/assets/js/lib/jquery-3.5.1.min.js: 60 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://se.net/assets/js/main.js?v=1.0.1: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 191 KB
191 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-W28062ZLM4&cx=c&gtm=4e64k0157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQXDQK5B117 KB64 KB (55%)✓3rd
https://se.net/assets/js/lib/jquery-3.5.1.min.js88 KB60 KB (68%)✓1st
https://se.net/assets/js/lib/modernizr.min.js?v=1.013 KB—✓1st
https://se.net/assets/js/main.js?v=1.0.15 KB—✗1st
https://se.net/assets/js/lib/underscore.min.js?v=1.0.116 KB—✓1st
https://se.net/assets/js/search.js?v=1.1.016 KB—✗1st
https://se.net/assets/js/home.js?v=1.0.110 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

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

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://se.net/assets/img/icons/icon-senet-unmatch... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://se.net/assets/img/icons/icon-senet-no-rest... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://se.net/assets/img/oversized-icon.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://se.net/assets/img/logos/senet-white-single... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://se.net/assets/img/logos/senet-primary.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://se.net/assets/img/icons/icon-senet-global-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://se.net/assets/img/icons/icon-senet-seo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://se.net/assets/img/icons/icon-senet-biz-exp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://se.net/assets/img/domain-comparison-table-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 165 KB
0 oversized -0 KB
13 legacy format
9 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

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

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

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

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

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

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

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

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

B
JS Execution Cost
977ms total JS execution
REVIEW
977ms total JS execution
Warning::
Unattributable: 313ms CPU time
Info::
https://se.net/: 221ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-W280...: 172ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WQX...: 140ms CPU time
Info::
https://se.net/assets/js/lib/modernizr.min.js?v=1....: 70ms CPU time
Warning::
Third-party scripts: 625ms (64% of total)

Main Thread Breakdown

Script Evaluation 40% Other 29% Style & Layout 16% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable313ms73ms0ms3rd
https://se.net/221ms6ms2ms1st
https://www.googletagmanager.com/gtag/js?id=G-W28062ZLM4&cx=c&gtm=4e64k0172ms134ms37ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQXDQK5B140ms99ms32ms3rd
https://se.net/assets/js/lib/modernizr.min.js?v=1.070ms34ms2ms1st
https://se.net/assets/js/lib/jquery-3.5.1.min.js60ms41ms8ms1st
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
718 KB transferred, 28 requests
PASS
718 KB transferred, 28 requests
Info::
Page weighs 1.2 MB (718 KB transferred)
Info::
28 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
718 KB / 2.4 MB budget
718 KB transferred
28 requests
0.15 g CO2 per page load
JavaScript 421.9 KiB 59%
Images 164.5 KiB 23%
CSS 101.1 KiB 14%
Fonts 19.6 KiB 3%
HTML 9.0 KiB 1%
Other 1.3 KiB 0%
Other 542 B 0%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
38% third-party, 0 ms blocking
PASS
38% third-party, 0 ms blocking
Info::
Third-party code accounts for 38% of page weight (274.7 KiB of 718.0 KiB)
Info::
Third-party blocking time is low (0 ms)
62%
38%
First-party Third-party
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
2 fonts (20 KB)
PASS
2 fonts (20 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

20 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 1.0 s 2.0 s 3.0 s FCP 2.6 s LCP 3.2 shttps://se.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2albert-sans-v1-latin-90... https://se.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 9.8 KiB — 287 ms — font-display: swaphttps://se.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2albert-sans-v1-latin-re... https://se.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 9.7 KiB — 293 ms — font-display: swap
albert-sans-v1-latin-90... woff2 swap
Size 10 KB
Load time 287 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
albert-sans-v1-latin-re... woff2 swap
Size 10 KB
Load time 293 ms
Start 1.2 s
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
28 resources · 718 KB · 191 KB savings available
PASS
28 resources · 718 KB · 191 KB savings available
Info::
Within 1MB page-weight target
Got: 718 KB
Info::
~191 KB of savings available
Info::
3 third-party resources (38% of weight)
28 resources · 718.0 KiB · 3 third-party Within 1MB page-weight target
JavaScript 59% · 421.9 KiB
Image 23% · 165.9 KiB
CSS 14% · 101.1 KiB
Font 3% · 19.6 KiB
Document 1% · 9.0 KiB
Other 0% · 542 B

~190.5 KiB of savings available

Remove unused JavaScript: 190.5 KiB
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
Network Waterfall
28 requests over 1967ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.6 s LCP 3.2 shttps://se.net// https://se.net/ — 200 — 9.0 KiB — 486 ms — http/1.1https://se.net/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://se.net/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 319 ms — http/1.1https://se.net/assets/css/style.css?v=1.1.3/assets/css/style.css?v=1.1.3 https://se.net/assets/css/style.css?v=1.1.3 — 200 — 50.7 KiB — 487 ms — http/1.1https://se.net/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://se.net/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 636 ms — http/1.1https://se.net/assets/img/logos/senet-white-single-color.svg/assets/img/logos/senet-white-singl... https://se.net/assets/img/logos/senet-white-single-color.svg — 200 — 12.2 KiB — 480 ms — http/1.1https://se.net/assets/img/logos/senet-primary.svg/assets/img/logos/senet-primary.svg https://se.net/assets/img/logos/senet-primary.svg — 200 — 11.6 KiB — 480 ms — http/1.1https://se.net/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://se.net/assets/img/icons/loader.svg — 200 — 3.0 KiB — 160 ms — http/1.1https://se.net/assets/img/icons/icon-senet-unmatched.png/assets/img/icons/icon-senet-unmatc... https://se.net/assets/img/icons/icon-senet-unmatched.png — 200 — 10.8 KiB — 160 ms — http/1.1https://se.net/assets/img/icons/icon-senet-global-trust.svg/assets/img/icons/icon-senet-global... https://se.net/assets/img/icons/icon-senet-global-trust.svg — 200 — 9.0 KiB — 160 ms — http/1.1https://se.net/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://se.net/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 477 ms — http/1.1https://se.net/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://se.net/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 165 ms — http/1.1https://se.net/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://se.net/assets/js/lib/underscore.min.js?v=1.0.1 — 200 — 16.3 KiB — 170 ms — http/1.1https://se.net/assets/js/search.js?v=1.1.0/assets/js/search.js?v=1.1.0 https://se.net/assets/js/search.js?v=1.1.0 — 200 — 16.2 KiB — 331 ms — http/1.1https://se.net/assets/js/home.js?v=1.0.1/assets/js/home.js?v=1.0.1 https://se.net/assets/js/home.js?v=1.0.1 — 200 — 9.8 KiB — 333 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-WQXDQK5Bwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WQXDQK5B — 200 — 117.2 KiB — 174 ms — h2https://se.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2/assets/fonts/albert-sans/albert-sa... https://se.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 200 — 9.8 KiB — 287 ms — http/1.1https://se.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2/assets/fonts/albert-sans/albert-sa... https://se.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 200 — 9.7 KiB — 293 ms — http/1.1https://se.net/assets/img/icons/icon-senet-seo.svg/assets/img/icons/icon-senet-seo.sv... https://se.net/assets/img/icons/icon-senet-seo.svg — 200 — 5.8 KiB — 310 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-W28062ZLM4&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-W28062ZLM4&cx=c&gtm=4e64k0 — 200 — 157.0 KiB — 70 ms — h2https://se.net/assets/img/icons/icon-senet-no-restrictions.svg/assets/img/icons/icon-senet-no-res... https://se.net/assets/img/icons/icon-senet-no-restrictions.svg — 200 — 7.0 KiB — 161 ms — http/1.1https://se.net/assets/img/icons/icon-senet-biz-expansion.svg/assets/img/icons/icon-senet-biz-ex... https://se.net/assets/img/icons/icon-senet-biz-expansion.svg — 200 — 4.2 KiB — 160 ms — http/1.1https://se.net/assets/img/oversized-icon.svg/assets/img/oversized-icon.svg https://se.net/assets/img/oversized-icon.svg — 200 — 9.3 KiB — 168 ms — http/1.1https://se.net/assets/img/domain-comparison-table-desktop.png/assets/img/domain-comparison-table... https://se.net/assets/img/domain-comparison-table-desktop.png — 200 — 50.1 KiB — 167 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-W28062ZLM4&gtm=45je64k0v9216915821z89216910805za20gzb9216910805zd9216910805&_p=1776894783213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1549107042.1776894784&frm=0&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512542&sid=1776894784&sct=1&seg=0&dl=https%3A%2F%2Fse.net%2F&dt=.SE.NET%20%7C%20A%20Flexible%20Domain%20for%20the%20Swedish%20Market&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1513region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-W28062ZLM4&gtm=45je64k0v9216915821z89216910805za20gzb9216910805zd9216910805&_p=1776894783213&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1549107042.1776894784&frm=0&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512542&sid=1776894784&sct=1&seg=0&dl=https%3A%2F%2Fse.net%2F&dt=.SE.NET%20%7C%20A%20Flexible%20Domain%20for%20the%20Swedish%20Market&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1513 — 204 — 542 B — 87 ms — h2https://se.net/assets/img/domain-comparison-table-mobile.png/assets/img/domain-comparison-table... https://se.net/assets/img/domain-comparison-table-mobile.png — 200 — 39.0 KiB — 161 ms — http/1.1https://se.net/assets/img/icons/senet-mag-glass-location.svg/assets/img/icons/senet-mag-glass-l... https://se.net/assets/img/icons/senet-mag-glass-location.svg — 200 — 1.9 KiB — 161 ms — http/1.1https://se.net/assets/img/icons/baseline-open_in_new-24px.svg/assets/img/icons/baseline-open_in_... https://se.net/assets/img/icons/baseline-open_in_new-24px.svg — 200 — 795 B — 161 ms — http/1.1https://se.net/assets/img/favicon-32x32.png?v=3/assets/img/favicon-32x32.png?v=3 https://se.net/assets/img/favicon-32x32.png?v=3 — 200 — 1.3 KiB — 160 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
64% of JavaScript execution is third-party
First-party Third-party 625ms · 274KB · €7/mo
Unattributable
Other
Costly
Execution 313ms
Transfer 0 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 172ms
Transfer 157 KB
Unused 42%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 140ms
Transfer 117 KB
Unused 55%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 313ms and costs ~€3/month

64% of JavaScript execution time comes from third-party scripts.

Why this matters

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

Unattributable takes 313ms 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

55% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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