About idea tuning

JetBrains doesn’t officially recommend GC switches like `-XX:+UseZGC` for general IDE speed-ups. The most commonly supported tuning is increasing the IDE heap (`-Xmx`), preferably using the IDE’s built-in ‘increase heap’ suggestion / settings. Other VM flags are considered advanced experimentation and can sometimes make things worse. The performance issues should be checked case by case.

https://youtrack.jetbrains.com/articles/SUPPORT-A-593/How-to-troubleshoot-IntelliJ-IDE-slowness-high-CPU-or-memory-usage