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I have removed some completion datalase using DB manager. Then I restarted IDE. Many DB updater threads was started on "background" fully blocking IDE.
Huh, now I see that autoupdate flag for most DB databases is set to true. It looks like setting get broken.. :-(.
The issue has been already fixed. Now, Parser DB threads are queued, so only one updating thread runs at a time. Autoupdate flags are disabled after restart.