I just started a new job where I'm subjected to Windows 11. They gave me a behemoth of a laptop. 64GB of RAM, absolute screamer of a CPU, big GPU, the whole deal. Windows 11's file browser lags when opening directories with more than 100-ish files. Windows 11's file browser takes a few seconds to open at all. Context menus take a noticeable amount of time to appear. I'm getting used to a new keyboard, so I keep hitti…
Your first gripe kind of sounds like DLP software is installed on the system and it is scanning files you're "accessing".
At work we use clownstrike for our driving-around-with-the-handbrake-on needs, which I have installed on both Linux and Windows, and the former flies while the latter lags all the time (I dual boot, so it's the same exact hardware). Doing something which is fully equivalent, like installing an IntelliJ update takes around a minute on Linux and many more on Windows.
The fan also comes on much more often on Windows than Linux, even though most of my job is done on remote servers via SSH. Under Linux I only hear the fan when I compile something. This morning I booted windows and the fan was running constantly while I was just catching up with a few mails in outlook.