I found the start up time for powershell to be quite noticeable in WSL for scripts like that.

If copying is all you're after you can invoke `clip.exe` instead.

Honestly though I just caved and ended up using an xserver with WSL for really smooth copy and paste support. Paste requires a powershell invocation without an xserver.

Definitely recommending X410 (paid) or VcrXsrv (free) -- let's you launch x11 apps too!

Once WSLu is released everything will be even more seamless though.