Slow network under WSL

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Created: 2025-08-23UTC00:000 / Updated: 2025-12-21UTC01:460 / Status: finished / Readability: technical / 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.