I recently installed Visual Studio 2013 Professional Update 2 on a Windows 7 virtual machine. I had been running VS 2012 with no problems, but I wanted to upgrade. Everythin
I had a similar problem here (25-30% CPU usage) and a message complaining about Microsoft SQL Server Compact 4.0 not being installed (not sure why, it was supposed to be installed with Visual Studio).
After downloading and installing it separately, the CPU usage issue was solved.