I installed this 30 min ago. 1. My M1 temp went from 28c to 60c 2. CPU utilization to 103%? 3. It's using 3.29Gb of RAM And it hasn't changed. With a single python project with 3k lines of code. VSCode sits at 280Mb and CPU temp around 28c. Edit: Vim + SpaceVim sitting at 17Mb :)
While annoying, all intellij EAPs (early access previews) are very cpu intensive, as they run in debug mode by default to create diagnostics and crash reports. Kinda similar like if you would keep the debugger open in your browser. Not sure if you can disable it, but thats the main reason why I stopped using EAPs for work. But the ram is typical intellij, they take what they can get from the OS :)
It's the opposite, they run in JVM so there's an upper bound at around -Xmx ("around" because you still have stack allocated and JNI allocated, but heap is usually the biggest pool of memory by a large margin)
on the flip side it also has a lower bound at -Xms
Personally I have mine running with 16/32G heap. It's my work computer not like I need the 64G ram for gaming :)