Performance and memory problems

Since CLion tries to parse your whole code base, including all the header files used, to understand your code correctly and provide accurate code completion, code navigation, refactorings and other intelligent features. On large code bases (especially when using Boost), performance and memory issues during indexing and editing are possible.

Increasing memory may help to resolve performance problems. To check the memory usage, enable the memory indicator in Preferences/Settings | Appearance & Behavior | Appearance | Show memory indicator.

To report a performance problem, please follow these instructions. To find IDE logs to attach to the problem, use this link.



Are there any other actionable items for performance issues? I have more than sufficient memory available sitting unused, yet something as simple as toggling between header and cpp file takes 10+ seconds. CLion performance seems to have steadily degraded over the past year I've been using it to the point that it's bordering on unusable for me now.


Any updates on this? I have the same exact issue with base IDEA.


I enabled the memory indicator as suggested, where would I expect to see the indicator?


It's in the bottom right corner of the window


Do we have any solution for this performance issue? I am using Pycharm inside my virtual box and its eating all my memory and slows down my performance. How can I fix this performance issue. Please suggest.


Having very similar issue with IDEA.

os: macOS mojave

cpu: 8th gen i7

mem: 16gb @ 2400mhz

Intellij IDEA @ 2018.3.1

No matter how much memory I've allocated to IDEA, it tries to consume it all and the editor gets really slow and non-responsive. I've allotted 1 -> 1.5 -> 2 -> 2.5 gb of ram and it still eats it all up. Doesn't matter what its set to.

This is a serious issue and extremely bothersome. May be going back to vscode if this doesn't get resolved.


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