Having issue while using multiple project on intellij

Hi,

What kind of projects do you have? How big are they?

Do you have the same problem with multiple brand new simple Java projects?

How much is the CPU usage? Please provide a screenshot of the system Activity Monitor.

Under normal circumstances, CPU is used while the projects are indexed and when you edit the code (to run inspections, highlighting, etc.) If CPU usage is high while the IDE is idle, a CPU snapshot can help understand what's going on and possibly fix it.

Make sure that:

• IDE default directories, installation folder, process itself and project files are all excluded from the Antivirus/firewall scan. For more information, see help article one and two.
• The IDE is installed on a fast local drive and project files are not located on network drives
• Unnecessary project folders are excluded from indexing if you are working on a large project (mark them as 'Excluded' in the File | Project Structure | Modules | Sources dialog).

Solutions to try:

• Increase the heap size in Help | Change Memory Settings. If it is too low, Garbage Collection process runs too often, using up the CPU and slowing down the IDE. You can increase it up to 85% of overall available memory.
• Temporarily disable all downloaded plugins and restart the IDE: Preferences | Plugins | ⚙ | Disable all downloaded plugins
• Switch the runtime JDK to default JetBrains Runtime in case something else is selected.

If the problem persists:

1. Capture a CPU usage snapshot. To keep the readings clean and on point, start the profiling only when performance actually drops, and stop it right after you are done testing.
2. Take a screenshot of the Help | Diagnostic tools | Activity Monitor window while experiencing high CPU usage
3. Collect the logs: Help | Collect Logs and Diagnostics Data (entire archive)
4. Upload everything for analysis (privately) to https://uploads.jetbrains.com/ and provide the upload id here.