Focus on stability and performances
Life as a developer is already complicated enough.
That's why developer tools that we use, like PhpStorm, must be stable and performing.
It is not possible to use a development tool that consumes 100% CPU without apparently doing anything (no activity running).
So, IMHO, JetBrains should focus less on new features and more on stability.
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Unfortunately, there is no way to have a magic pill to fix all performance issues at once and each scenario should be investigated separately.
What I may suggest is to collect logs (Help > Collect Logs) and CPU Snapshot and leave a report on our YouTrack portal:
https://youtrack.jetbrains.com/newIssue
For more information about CPU snapshot collection please check:
https://intellij-support.jetbrains.com/hc/en-us/articles/207241235-Reporting-performance-problems