I have been using 18.0.1 (on Win XP SP3) for a couple of weeks now (am a trial use) and have been seeing very high (50%) cpu usage AFTER closing SE. Using Process Explorer, I start SE, see that it is using fairly common cpu usage (< 5%) for most of my work (editing C++ files, doing lookups, etc) and it shows up as vs.exe. I then close SE and the cpu usage goes up to 50%. I know it is the same program because the PID stays the same in Process Explorer. I can kill the process and it goes away. If I don't kill the process, I can start another instance of SE and it does the same low cpu usage. Closing that version then changes the cpu usage on that one to about 40% and the original drops down to about 45%. I can keep starting/stopping the program and the process still stays, taking up more cpu time.
I have attached a jpg that shows three vs.exe processes running (after starting/closing SE 3 times).
