I can still feel performance increases, most recently was when I got an M4 Mac Mini. Compared to my M2 Air, which is no slouch by any means, there was a very perceptible improvement in latency, app opening, general task completion, and so on. But very slight, and some coming from placebo effect/marketing.
These days, I feel the most performance uplift when I switch from Windows/macOS over to a Linux or BSD installation, if only because there is so little wasted effort in running a bajillion little background tasks for crap I didn't ask for. Windows 10 on my PC is highly debloated and optimized, very little in my startup services and so on, but CachyOS on the same hardware feels leagues better.
These days, I feel the most performance uplift when I switch from Windows/macOS over to a Linux or BSD installation, if only because there is so little wasted effort in running a bajillion little background tasks for crap I didn't ask for. Windows 10 on my PC is highly debloated and optimized, very little in my startup services and so on, but CachyOS on the same hardware feels leagues better.