Well, if you care about DX12 game performance only, first you need to wait for a game that supports directx12.
none of the previous directx versions have had any magical band-aid patch that would magically fix earlier versions performance or do any such magic.
As for the rest, I would assume that week or so would clear most of the awful bugs out. Rest of the waiting time depends on software support like if your antivirus and/or firewall/other things have support for windows 10.