Speed in large projects. IntelliJ is super slow once you have huge source/text files. E.g. WebStorm is unusable for debugging as one step over takes ~10s on a 128GB RAM machine in such cases.
I am mentioning this in the off chance you did not tried it, exclude the node_modules/vendors/build folders or other third party code that is not part of your project you are editing.
I am not experiencing this issue and I have a large project PHP and JS plus the plugins for jquery and angular , all linting on. After the project loads I don't feel any lag, I run an i5 6th gen CPU , 4cores. I might have tweaked some VM options years back (my configs and styles are at least 5-6 years old so I do not remember).
Also if you transpile all your js into a big minified file, exclude that too, right click on it and there must be an option as mark as plain text.
