Should be better when this land (next version) https://youtrack.jetbrains.com/issue/JBR-745

(switch rendering API in JRE used by Intellj/Pycharm to Metal for rendering)

Because you are most likely running the Intel version, not the Apple Silicon one! Check it in the Activity Monitor. There should be a "Kind" column on the CPU or Memory tabs. If not, you can turn on that column via a right click on the headers.