Slow network under WSL

History / Edit / PDF / EPUB / BIB /
Created: August 23, 2025 / Updated: August 23, 2025 / Status: finished / 1 min read (~71 words)
wsl network performance

When I started using WSL on Windows 11 I had slow network performance issues.
We're talking running speedtest-cli and getting ~3 Mbps download speeds while my connection can reach 400 Mbps.

After searching online for a while and trying a variety of things I finally found a solution.

In %USERPROFILE%\.wslconfig add the following:

[wsl2]
networkingMode=mirrored

With this fix applied I'm now getting ~400 Mbps download speeds in WSL, matching my native Windows performance.