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WSL has horrible horrible IO performance. It's really not going anywhere until they fix it, and the fix won't be easy

But they don't really need to fix it. Sure, it'd be nice, but they're targeting developer machines and utilities with WSL, not a server replacement of Linux. Nobody would buy a Windows license just to serve from LAMP stacks on WSL over Azure or something. Speed requirements for dev machines are a little less stringent, and as long as they are hitting better-than-Docker numbers, they will still be providing value.

Sidenote: looks like I/O performance is really not that bad in most cases already, and sometimes even faster than Linux distros like Ubuntu: https://www.phoronix.com/scan.php?page=article&item=wsl-febr...

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