I'm thinking about disabling the dwm.exe process. It seems that I can do fine without the fancy feature of [Wind]+[Tab], and am generally needing to cut memory.
Does it have unintended side-effect?
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There are no functionality related side effects except some minor UI ones like, you won't be getting Thumbnail previews in the taskbar. Aero peek will be disabled(You have to click instead of just pointing). You won't be able to change Taskbar color and stuff like that. Another advantage of disabling DWM is that it reduces the boot up time.
You can go to System Properties --> Advanced system Settings --> Click Settings in Performance Panel under Advanced tab --> You can uncheck/disable most of the items there to speed up your system a bit. Also you can check Services and Startup processes, there may be many unnecessary ones which you can disable including Windows related ones.