I recently converted a large SVN repository to Git using git-svn.

Started on Windows. After five days it failed for some reason so I had to rerun it (forgot an author or along those lines, trivial fix). Meanwhile I looked into why it was so slow, and saw git-svn spun up perl commands like crazy.

Decided to spin up a Linux VM. After fixing the trivial issue it completed in literally a couple of hours.

Some people use WSL as an epicycle to fix this.