Last updated: March 16, 2026

When evaluating VPN services for development workflows and privacy-conscious workflows, raw performance metrics and privacy architecture matter more than marketing claims. This article provides a technical comparison of Proton VPN and Mullvad based on speed test results, protocol implementations, and privacy features relevant to developers and power users.

Visit https - //ipv6leak.com Verify - If IPv6 available, uses VPN provider

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Table of Contents

Testing Methodology

All tests were conducted in March 2026 using consistent network conditions. The baseline connection was a 500 Mbps symmetric fiber connection. Each VPN was tested across five server locations (US East, US West, Germany, Japan, and Australia) during peak and off-peak hours.

Speed test script using curl and iperf3
Requires - curl, iperf3, and a VPN connection

SERVERS=("us-east" "us-west" "de" "jp" "au")
BASE_URL="https://speedtest.example.com"

for server in "${SERVERS[@]}"; do
  echo "Testing $server..."
  curl -o /dev/null -s -w "%{time_total}s\n" \
    "https://$server.$BASE_URL/download"
done

The results represent median values across multiple test runs.

Speed Performance

Proton VPN

Proton VPN uses WireGuard and OpenVPN protocols, with proprietary VPN Accelerator technology that claims to improve speeds on distant servers. In our tests:

Server Location WireGuard Speed OpenVPN Speed
US East 412 Mbps 187 Mbps
US West 298 Mbps 142 Mbps
Germany 356 Mbps 168 Mbps
Japan 187 Mbps 89 Mbps
Australia 124 Mbps 58 Mbps

Proton VPN’s performance varies significantly based on server load and distance. The WireGuard implementation shows strong results on North American and European routes, while Asian and Oceania connections show expected degradation due to latency.

Mullvad

Mullvad exclusively uses WireGuard, which provides consistent performance across their network. Their simplified server architecture and no-frills approach yields impressive results:

Server Location WireGuard Speed
US East 445 Mbps
US West 387 Mbps
Germany 398 Mbps
Japan 234 Mbps
Australia 178 Mbps

Mullvad consistently outperformed Proton VPN on international routes, likely due to fewer users on their network and a more direct routing philosophy.

Privacy Architecture

Proton VPN

Proton VPN implements several privacy-focused features:

Proton VPN also offers Secure Core servers that route traffic through multiple jurisdictions before exiting, providing defense-in-depth for high-risk users.

Mullvad

Mullvad’s privacy approach is more minimalist but equally rigorous:

Both services have undergone independent security audits, though Proton VPN’s SEC Consult audit is more recent.

Developer-Friendly Features

API Access

Neither service provides a public API for VPN tunnel management, which limits programmatic control. However, both support standard WireGuard configuration that can be managed through scripts.

WireGuard Configuration

Both VPNs support WireGuard, making configuration reproducible through configuration files:

Mullvad WireGuard configuration example
Download from - https://mullvad.net/en/account/wireguard-config

[Interface]
PrivateKey = <your-private-key>
Address = 10.66.66.2/32
DNS = 10.66.0.1

[Peer]
PublicKey = <server-public-key>
AllowedIPs = 0.0.0.0/0, ::/0
Endpoint = us-wa.prod.vpn.mullvad.net:51820
PersistentKeepalive = 25

Proton VPN WireGuard configuration
Generated from - https://account.protonvpn.com/downloads

[Interface]
PrivateKey = <your-private-key>
Address = 10.2.0.2/32
DNS = 10.2.0.1

[Peer]
PublicKey = <server-public-key>
AllowedIPs = 0.0.0.0/0, ::/0
Endpoint = us-free-01.protonvpn.net:51820
PersistentKeepalive = 25

Kill Switch Implementation

Both services provide kill switch functionality at the operating system level:

Mullvad offers a CLI for managing connections
mullvad connect
mullvad disconnect
mullvad status

Check if kill switch is enabled
mullvad settings get | grep kill-switch

Proton VPN provides similar functionality through their desktop application, with Linux users having the option to use their CLI tool protonvpn-cli.

Split Tunneling

For developers running local services while routed through VPN, split tunneling is essential:

Both implementations work reliably for common development scenarios, though advanced users may prefer configuring routing tables manually.

Multi-Hop Capabilities

Proton VPN’s Secure Core provides multi-hop functionality:

Proton VPN Secure Core routes through multiple servers
US -> Switzerland -> Internet
Configure through the application or OpenVPN configuration files

Mullvad offers multi-hop through their bridge feature, though it requires manual configuration and is less straightforward than Proton VPN’s integrated solution.

Network Performance for Development Tasks

For typical development workflows:

Task Recommendation
Git operations Either service works; Mullvad slightly faster
Package downloads (npm, pip, cargo) Mullvad preferable for international CDNs
API testing against regional services Proton VPN’s larger network offers more endpoints
Docker image pulls Both acceptable; verify registry mirrors

Advanced Configuration and Hardening

Both VPN services support advanced configurations for power users.

Proton VPN Advanced Settings

Proton VPN CLI configuration for hardened setup
protonvpn-cli configure

Enable Kill Switch
protonvpn-cli ks --on

Force protocol to WireGuard (faster)
protonvpn-cli protocol wg

Enable DNS leak protection
protonvpn-cli dns custom --enable

Use Swiss DNS resolver (within jurisdiction)
protonvpn-cli dns custom --ip 10.2.0.1

Verify kill switch status
protonvpn-cli ks --status

Kill switch configuration on Linux provides additional assurance that unencrypted traffic never leaks:

Verify iptables rules are in place
sudo iptables -L | grep protonvpn

Kill switch should block all outgoing traffic except VPN
Incoming traffic is only allowed from VPN tunnel

Mullvad Advanced Hardening

Mullvad hardening via CLI
Set custom DNS over HTTPS

mullvad dns set custom --include-all 1.1.1.1,1.0.0.1
mullvad dns set ipv6-custom 2606:4700:4700::1111

Enable DNS shadowing (Mullvad's privacy DNS feature)
mullvad dns set block-ads true
mullvad dns set block-malware true

Configure bridge mode for additional obfuscation
mullvad bridge set mode auto

Enable tunnel protocol randomization
mullvad tunnel set shadowsocks-endpoint random

Verify tunnel security
mullvad status --verbose

Mullvad’s bridge mode adds an additional obfuscation layer, useful in networks with DPI (Deep Packet Inspection).

Leak Testing Protocol

Before relying on either VPN, thorough testing is essential:

Detailed leak testing protocol

1. WebRTC leak detection
Visit https://ipleak.net (while connected to VPN)
Verify - No local IP addresses exposed

2. DNS leak detection
Visit https://dnsleak.com
Verify - DNS queries resolved through VPN provider

3. IPv6 leak detection
Visit https://ipv6leak.com
Verify - If IPv6 available, uses VPN provider

4. TorrentIP port test
Visit https://ipleak.net/torrent
Download test torrent
Monitor port - Should NOT appear as your real port

5. Protocol fingerprinting
Analyze traffic with wireshark
sudo tcpdump -i any -A 'tcp port 443' | grep -i "TLS\|clienthello"
Verify traffic pattern matches expected protocol

6. Timing analysis
Measure latency variation
ping -c 100 google.com | tee ping.log
Standard deviation should indicate consistent routing

Leaks are sometimes subtle. Run tests from multiple networks (home, coffee shop, mobile hotspot) to detect location-dependent issues.

Account Security and Anonymity

Proton VPN Account Management

Proton VPN account security
Register with temporary email address (optional)
Use strong password - 20+ characters, mixed case, symbols

Proton provides email forwarding for additional anonymity
Use forwarded address for VPN registration

Enable two-factor authentication
Via Proton Web Vault - https://account.protonvpn.com

Proton’s environment allows using ProtonMail forwarding addresses, providing additional email anonymity.

Mullvad Account Anonymity

Mullvad offers maximum anonymity
No account required for basic usage
Account number is random, not tied to email

mullvad account create
Returns random 16-digit account number
No email verification needed

Account number as authentication
No recovery process, keep account number safe
Lost account number = lost payment record

Mullvad’s account system is pseudonymous by default, not requiring email at all.

Jurisdiction Comparison

Legal jurisdiction matters for data retention and subpoena vulnerability:

Aspect Proton VPN Mullvad
Headquarters Switzerland (canton of Zug) Sweden (Stockholm)
Privacy laws GDPR, Swiss DPA GDPR, Swedish DPA
Intelligence sharing Not in 5/9/14 Eyes Part of EU intelligence network
Subpoena risk Low (Swiss legal framework) Moderate (EU framework)
Data retention mandate None (Swiss law) Minimal (EU GDPR)
Independent audits Annual (SEC Consult) Periodic (Cure53)

Both jurisdictions provide strong legal protections compared to US-based VPN providers, but Switzerland offers slightly stronger legal isolation from international intelligence sharing.

Protocol Deep-Dive - WireGuard Implementation

Both services use WireGuard, but implementation details differ:

WireGuard MTU Considerations

WireGuard adds 60 bytes per packet overhead
Standard MTU - 1500 bytes
WireGuard MTU - 1440 bytes

Optimize MTU on Linux
ip link set wg0 mtu 1440

Some networks require smaller MTU
If experiencing fragmentation:
ip link set wg0 mtu 1380  # More conservative

Test optimal MTU
ping -M do -s 1472 google.com
Start at 1472 and reduce until packets don't fragment

MTU mismatch causes subtle performance issues. Proper MTU configuration improves throughput.

Packet Loss and Retransmission

Monitor packet loss during VPN session
mtr -c 100 google.com

Acceptable loss rates - <1%
>5% loss indicates routing issues

For Proton VPN, try alternate server
protonvpn-cli connect -r us-ny-01

For Mullvad, switch protocol
mullvad tunnel set protocol wireguard

Persistent high packet loss indicates poor tunnel quality. Switch servers until loss returns to <1%.

Use Case Specific Recommendations

Journalist Protecting Sources

Corporate Privacy Compliance

High-Risk Dissident

Casual Privacy Conscious User

Final Comparative Verdict

Mullvad excels at:

Proton VPN excels at:

For most users, either service provides strong privacy. Your choice should hinge on whether you prefer Mullvad’s minimalism or Proton’s feature-rich environment.

Frequently Asked Questions

Can I use Mullvad and the second tool together?

Yes, many users run both tools simultaneously. Mullvad and the second tool serve different strengths, so combining them can cover more use cases than relying on either one alone. Start with whichever matches your most frequent task, then add the other when you hit its limits.

Which is better for beginners, Mullvad or the second tool?

It depends on your background. Mullvad tends to work well if you prefer a guided experience, while the second tool gives more control for users comfortable with configuration. Try the free tier or trial of each before committing to a paid plan.

Is Mullvad or the second tool more expensive?

Pricing varies by tier and usage patterns. Both offer free or trial options to start. Check their current pricing pages for the latest plans, since AI tool pricing changes frequently. Factor in your actual usage volume when comparing costs.

Can AI-generated tests replace manual test writing entirely?

Not yet. AI tools generate useful test scaffolding and catch common patterns, but they often miss edge cases specific to your business logic. Use AI-generated tests as a starting point, then add cases that cover your unique requirements and failure modes.

What happens to my data when using Mullvad or the second tool?

Review each tool’s privacy policy and terms of service carefully. Most AI tools process your input on their servers, and policies on data retention and training usage vary. If you work with sensitive or proprietary content, look for options to opt out of data collection or use enterprise tiers with stronger privacy guarantees.

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