After 2 videos I'm still not convinced Bryan's 100% ruled out his own builds and Windows installs?? I appreciate that he's put some effort into establishing commonality between the 10850K and 13900K systems but there's not much extra effort made to rule out just about anything else.
OC, mem and BIOS settings? What BIOS? How many times did he reinstall Windows to repeat the test on either setup? Exactly what sort of stuff he's loading Windows down with? Windows builds being used? Did he allow Windows Update to auto-fetch any platform-related drivers? Exactly how many reviewer anecdotes did he collect corroborating (for example) the specific Office mouse jumpiness bug, and what sort of specs? Regarding DPC latency tests, are we ruling out Nvidia as the culprit during every test? Regarding random observed "slow Windows" symptoms, they pretty much remain completely anecdotal, and no word as to how consistently reproducible they are.
Being a self-described "edge case", if ignoring all other potential factors that have not been eliminated, seems like most of the behaviour can still be described as Intel still needing to fine tune Thread Director behaviour for applications like Premiere, and maybe MS has work to do as well. No need to go off the deep end with vague speculation regarding "I/O driver being moved off the CPU"?
Core-to-core latency, negative effect of E-cores, and the Alder Lake/Raptor Lake ringbus are largely a known factor as well. AT and Chips&Cheese both covered this stuff a long time ago. The overall latency picture for the ringbus is not rosy but not horrible (progressively worse starting from 8th gen), and overall AMD runs a tighter ship within the CCX. E-cores being online does have some perceptible negative impact on stuff like cache performance, but all in all nowhere near the severity of the symptoms Bryan is showing.
He's promised more testing and maybe even Ryzen testing so I guess I'll keep waiting on this to unfold.
But man........linking screenshots of random "X feels snappier than Y" forum posts (including from TPU) is pretty funny. I thought he's trying to convince everyone that all of this *isn't* just seat-of-the-pants feeling? And the "statement" he got from Intel sounds like nothing more than a vague red herring that the Intel rep threw at him to stop bothering them - doesn't sound like a promise that Intel is aware or investigating or doing anything really.
And I hope Bryan doesn't need a reminder how much of a dumpster fire 11th gen was. Even if latency is the cause, 11th gen certainly isn't the saviour here.