Skip to content
https://www.mullvad.net

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
3
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
95
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.
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.

992 ms

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

1.28 s

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

0 ms

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

0.008

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

997 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.

1.29 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
7 PASS 2 REVIEW 3 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 82 requests
FIX
2.3 MB transferred, 82 requests
Info::
Page weighs 4.0 MB (2.3 MB transferred)
Info::
82 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
82 requests
0.48 g CO2 per page load
Other 1.2 MiB 52%
Other 650.5 KiB 28%
Fonts 199.4 KiB 9%
JavaScript 119.7 KiB 5%
Images 111.3 KiB 5%
HTML 17.9 KiB 1%
CSS 16.9 KiB 1%
Other 2.0 KiB 0%
Other 401 B 0%
0 2.4 MB 4.9 MB
Approaching limit
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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.

B
JS Execution Cost
540ms total JS execution
REVIEW
540ms total JS execution
Warning::
https://mullvad.net/en: 272ms CPU time
Info::
Unattributable: 179ms CPU time
Info::
https://mullvad.net/_app/immutable/chunks/CbqrmVTX...: 88ms CPU time
Warning::
Third-party scripts: 540ms (100% of total)

Main Thread Breakdown

Other 48% Style & Layout 24% Script Evaluation 20% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://mullvad.net/en272ms3ms0ms3rd
Unattributable179ms39ms0ms3rd
https://mullvad.net/_app/immutable/chunks/CbqrmVTX.js88ms73ms0ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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+
Image Optimization
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Warning::
https://media.mullvad.net/web/desktop-2024.png?wid... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
3 images 111 KB
0 oversized -0 KB
0 legacy format
1 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

A+
Font Loading
13 fonts (199 KB)
PASS
13 fonts (199 KB)
Info::
13 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

13

199 KB total

Render-blocking

0

of 13

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 992 ms LCP 1.3 shttps://mullvad.net/_app/immutable/assets/martian-mono-latin-wght-normal.5W32yIyr.woff2martian-mono-latin-wght... https://mullvad.net/_app/immutable/assets/martian-mono-latin-wght-normal.5W32yIyr.woff2 — 23.2 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/source-sans-pro-cyrillic-600-normal.7IW-0rI7.woff2source-sans-pro-cyrilli... https://mullvad.net/_app/immutable/assets/source-sans-pro-cyrillic-600-normal.7IW-0rI7.woff2 — 8.0 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-cyrillic-400-normal.DvjyhnTk.woff2open-sans-cyrillic-400-... https://mullvad.net/_app/immutable/assets/open-sans-cyrillic-400-normal.DvjyhnTk.woff2 — 11.1 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-cyrillic-600-normal.BuMhxFId.woff2open-sans-cyrillic-600-... https://mullvad.net/_app/immutable/assets/open-sans-cyrillic-600-normal.BuMhxFId.woff2 — 11.1 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-cyrillic-700-normal.Db4W_Rwa.woff2open-sans-cyrillic-700-... https://mullvad.net/_app/immutable/assets/open-sans-cyrillic-700-normal.Db4W_Rwa.woff2 — 10.9 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/source-sans-pro-latin-ext-600-normal.XGkkjFz7.woff2source-sans-pro-latin-e... https://mullvad.net/_app/immutable/assets/source-sans-pro-latin-ext-600-normal.XGkkjFz7.woff2 — 20.2 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-latin-ext-400-normal.URAvo6nN.woff2open-sans-latin-ext-400... https://mullvad.net/_app/immutable/assets/open-sans-latin-ext-400-normal.URAvo6nN.woff2 — 15.3 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-latin-ext-700-normal.DatbY7Hl.woff2open-sans-latin-ext-700... https://mullvad.net/_app/immutable/assets/open-sans-latin-ext-700-normal.DatbY7Hl.woff2 — 15.0 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-latin-ext-600-normal.CXDaa6Q7.woff2open-sans-latin-ext-600... https://mullvad.net/_app/immutable/assets/open-sans-latin-ext-600-normal.CXDaa6Q7.woff2 — 15.2 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/source-sans-pro-latin-600-normal.BM2CBz6W.woff2source-sans-pro-latin-6... https://mullvad.net/_app/immutable/assets/source-sans-pro-latin-600-normal.BM2CBz6W.woff2 — 14.7 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-latin-400-normal.Bk63H6sG.woff2open-sans-latin-400-nor... https://mullvad.net/_app/immutable/assets/open-sans-latin-400-normal.Bk63H6sG.woff2 — 18.4 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-latin-700-normal.CceUhp2e.woff2open-sans-latin-700-nor... https://mullvad.net/_app/immutable/assets/open-sans-latin-700-normal.CceUhp2e.woff2 — 18.0 KiB — 0 ms — font-display: swaphttps://mullvad.net/_app/immutable/assets/open-sans-latin-600-normal.Cp4N6AwT.woff2open-sans-latin-600-nor... https://mullvad.net/_app/immutable/assets/open-sans-latin-600-normal.Cp4N6AwT.woff2 — 18.4 KiB — 0 ms — font-display: swap
martian-mono-latin-wght... woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
source-sans-pro-cyrilli... woff2 swap
Size 8 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-cyrillic-400-... woff2 swap
Size 11 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-cyrillic-600-... woff2 swap
Size 11 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-cyrillic-700-... woff2 swap
Size 11 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
source-sans-pro-latin-e... woff2 swap
Size 20 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-latin-ext-400... woff2 swap
Size 15 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-latin-ext-700... woff2 swap
Size 15 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-latin-ext-600... woff2 swap
Size 15 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
source-sans-pro-latin-6... woff2 swap
Size 15 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-latin-400-nor... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-latin-700-nor... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-latin-600-nor... woff2 swap
Size 18 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+
JS Bundles
48 scripts, 0 KB unused
PASS
48 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://mullvad.net/_app/immutable/entry/start.B7dUx2Pa.js0 KB—✓3rd
https://mullvad.net/_app/immutable/entry/app.S3a_2s1E.js9 KB—✓3rd
https://mullvad.net/_app/immutable/chunks/CCHWH_DR.js12 KB—✓3rd
https://mullvad.net/_app/immutable/chunks/CbqrmVTX.js22 KB—✓3rd
https://mullvad.net/_app/immutable/chunks/BNMJouZY.js1 KB—✓3rd
https://mullvad.net/_app/immutable/chunks/N07Kv-m5.js0 KB—✓3rd
https://mullvad.net/_app/immutable/chunks/CgQugkeh.js2 KB—✓3rd
https://mullvad.net/_app/immutable/chunks/D8zj3yWo.js0 KB—✓3rd
https://mullvad.net/_app/immutable/chunks/ksVfiGWN.js1 KB—✓3rd
https://mullvad.net/_app/immutable/chunks/twkb37T4.js0 KB—✓3rd
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
Network Waterfall
82 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
100% of JavaScript execution is third-party
First-party Third-party 540ms · 40KB · kr98/mo
mullvad.net
Other
Costly
Execution 272ms
Transfer 18 KB
Monthly Cost kr49/mo
Unattributable
Other
Optional
Execution 179ms
Transfer 0 KB
Monthly Cost kr33/mo
mullvad.net
Other
Optional
Execution 88ms
Transfer 22 KB
Monthly Cost kr16/mo

These scripts may cost more than they're worth

  • mullvad.net adds 272ms and costs ~kr49/month

100% 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

mullvad.net takes 272ms 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