I really dig the idea of Pycharm and would love to use it. However, its tendency to consume the computer\'s processing power and lag is a large drawback.
In the near fut
First of all: you can disable inspections. In right bottom, on status bar, next to memory usage indicator, there is a little Hector head - click it and select "syntax" level. I belive this will help a lot.
If this won't help enough you can set "Power save mode". From PyCharm help:
When Power Save Mode is on, PyCharm reduces its functionality to the one of a text editor, by not executing expensive background activities that drain laptop battery.