All my issues were with Node and packages dependencies.
I would not call anything Windows related fast.
Maybe it was an older version of WSL that you were using. Yarn install is pretty speedy for me with Windows 18.09's WSL.
You might want to try disabling Windows Defender for WSL or even all together. I know a lot of people said WSL was slow for them when you run that tool. It was one of the first things I disabled after installing Windows before I even used WSL.
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