I have been using Sourcetree for some time. Most recently, I have been using the lastest version (2.1.2.5) and I notice 2 things:

• As I leave Sourcetree open for a while, my CPU utilization seems to climb. I don’t have hard stats to prove that this is from sourcetree specifically, but this is a consistent trend that I have noticed.
• After I close Sourcetree (I have been careful as of late not to leave Sourcetree open because of issue #1), I see that Putty is still running and PERL is still running (and taking a good chunk of CPU usage many times).