First, I would suggest you to check in your server, what is causing this CPU usage of 100%.
If is Confluence itself, or any other application installed in the server.
Then you need to identify if this performance problem is happening when someone perform some specific action in the application, or this is happening anytime when the application is running.
I would suggest you to check our official document for performance tuning:
And for further assistance on performance issues, is recommended to forward the issue to support.atlassian.com, so we will be able to better assist you.
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