[blunte]

I too use it on an older (2014) mbp, and it is fine for Rubymine.

I highly suspect the performance problems some people experience are due to plugins. When I was doing some Elixir/Phoenix work, the Elixir plugin made it unusable sometimes. Clearly that plugin had some serious issues which would appear at times. I have not had the same performance problems in Rubymine or in vanilla IDEA.

[brundolf]

I've had sluggishness on a 2019 MBP with totally vanilla Webstorm, no third-party plugins. It was usable, but bad enough to turn me off and send me back to VSCode.

[blunte]

My work laptop is a 2018 or 19 i5 13" MBP with an Intel GPU. It sometimes feels slower than my old MBP (i7 with Nvidia 680 or somesuch GPU). I doubt the CPU difference is the issue, but perhaps there's enough GPU difference that can cause IDEA to be slower on machines without a dedicated GPU.

Or who knows; could be something about the projects - number or sizes of files, language used and references between files, etc.