You mean the Windows kernel that powers Azure, used to run those GNU/Linux instances?
https://techcommunity.microsoft.com/t5/windows-os-platform-b...
https://techcommunity.microsoft.com/t5/windows-os-platform-b...
When not AWS, it is Azure, so the performance isn't that bad to start with.
Also AWS and GCP aren't running cloud instances of game consoles (which also use a variation of Windows), GCP one (Stadia) powered by Linux was a failure, nor are they running an AI service being used by millions of folks around the globe.
Not bad.