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
In the hardware end, upgrading your system is a fair choice. PyCharm recommends 1 GB of RAM as stated in the system requirements at the PyCharm website.
You could disable a few of PyCharm's functionalities like disabling inspections. You could also turn on "Power Save Mode" for PyCharm.
You could also use a lighter operating system when running PyCharm, or kill a few processes to reduce the load of the computer.
If PyCharm is still heavy for you, you could try out Python for VS Code, KDevelop, or you could go use a text editor such as Atom for Python development. Here's a full list of Python IDEs.