Setup: Windows 7 Ultimate, running in a VMware box inside Windows 8, VMware Tools installed; VMware Workstation is the only application launched in win8). Aero is on.
Starting a few months ago, on and off, performance is extremely sluggish in all applications. Checking process explorer shows high CPU usage by dwm.exe (20-30%) and svchost.exe (30-40%) when system is idle, nothing open but Explorer.
Killing dwm.exe does not change anything; dwm resumes its high cpu usage when it restarts.
Services in svchost are:
- Audio Endpoint Builder
- CSC Service
- WDI System Host
Turning off Aero helps slightly, but I want to actually solve the problem. This problem didn't exist before; it wasn't sluggish, dwm.exe only had high usage when it was actually compositing windows together; I never noticed any high usage from that svchost.
edit when I'm running one app at a time, occasionally large areas of the app go black, like in the olden days with Win 95 when it would run out of system resources.