This doesn't make a lot of sense off the bat, are there more details to the story that explain how CPU branch prediction performance depends on Windows behaviour somehow?
Basically (according to him) they disabled the spectre/meltdown mitigation if you were an admin - because you were an admin and have full rights to the machine anyway. So now they are doing that for all users?
He wasn't clear - or at least it wasn't clear to me. So the mitigations are no longer needed? I think I have more questions than before after listening to that.
https://x.com/davepl1968/status/1812559735616577565
He claims he wrote realtime rendering of vertical text in start menu.
Turns out he didn't. No released or unreleased version or source code show that.
This is just shooting from the hip, but there is a ton of different stuff going on in both the OS and the CPU around this.