IntelliJ IDEA Ultimate high CPU when running tests
Answered
I'm seeing high CPU usage and slowness when running tests from IntelliJ IDEA Ultimate in a Windows VDI environment.
I have tried moving the repo from OneDrive to a local user profile path and also adjusted the IntelliJ memory setting, but the issue still happens when running from the local path.
I have attached the IntelliJ logs. Could you please help check if there is anything in the logs that points to a plugin, indexing, project scanning, or IDE issue causing the high CPU?
Thanks.
Upload id: 2026_07_03_EvCmUP75uAgje59qHXc23b (file: idea-logs-20260623-18291517626659612022358386.zip)
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Hi John,
Please perform the following steps to help us investigate this issue:
1. Move your project to the local user profile;
2. Make sure that IDE directories (https://intellij-support.jetbrains.com/hc/en-us/articles/206544519), installation folder, process itself (
idea64.exe) and project files are all excluded from the ANTIVIRUS / Firewall scan.For more information and instructions, see article one and two.
3. Open this project in IntelliJ IDEA;
4. Capture a CPU snapshot covering at least 20–30 seconds of IDE performance while the tests are running and you’re experiencing high CPU usage: Help | Diagnostic Tools | Start/Stop CPU Usage profiling.
To keep the readings clean and on point, start the profiling only when performance actually drops, and stop it right after you’re done.
5. After reproducing the problem and capturing a CPU snapshot, collect fresh IDE logs through Help | Collect Logs and Diagnostic Data;
6. Upload a CPU snapshot and IDE logs securely to our server https://uploads.jetbrains.com/ and provide us with the Upload ID. The uploaded data will be accessible only to our team and will be used solely for investigating this issue.
Thank you in advance!