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Has happened to me a couple of times in recent dev builds (currently using 050824 w/ Mustang on Linux) that sometimes CPU usage will go to 100% for no obvious reason.
Created attachment 24189 [details] Thread dumps (note that IDE is not even focussed when these are taken - should be completely idle)
When it happens, just have to restart the IDE.
Seems like duplicate of issue #61281. *** This issue has been marked as a duplicate of 61281 ***