PyCharm running way slow

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1. Change the inspection level

Current PyCharm versions allows you to change the type of static code analysis it performs, and also features a Power/CPU Saving feature (Click on the icon at the bottom right, next to the lock):

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2. Change indexed directories
Exclude directories from being indexed which are set in the project paths but not actually required to be searched and indexed. Press ALT+CTRL+S and search for project.

3. Do memory sweeps
There is another interesting feature:

Go into the settings (File/Settings) and search for memory. In IDE Settings>Appearance -> tick Show memory indicator. A memory bar will be shown at the bottom right corner (see the picture below). Click this bar to run a garbage collection / memory sweep.

enter image description here

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