As you use WSL, the VHDX disk image will grow. You need to compact it!

1. Cleanup

Start by cleaning up the disk. Each user can choose their preferred method.

2. fstrim

Once everything is clean, you can force the system to discard unused elements from the image.

sudo fstrim -av

3. Installing wslcompact

The wslcompact project is a PowerShell module that allows you to compact the disk efficiently.

Set-ExecutionPolicy RemoteSigned -Scope CurrentUser
iwr -useb https://raw.githubusercontent.com/okibcn/wslcompact/main/setup | iex

Note: On the latest versions of WSL (2.5.4.0?), you may need to patch the file as shown in this commit.

4. Running the script

This will shut down WSL, copy the disk data into a new VHDX, and then replace the old one.

WslCompact -c -d