My macbook has a high cpu usage because of one process and i don't know why.
This is the process all the time at 130% 
I think it has something to do with this log. The log is getting spammed only with this message. 
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What app is that with the colored graph? It looks nice.– fsbCommented Jun 11, 2016 at 20:16
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@fbara bjango.com/mac/istatmenus– Michael MaluraCommented Jun 13, 2016 at 7:43
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3 Answers
com.apple.bkagentservice is part of BookKit, which itself is part of iBooks.
Based on the limited information in your question I'd guess the BKAgentService is trying to reconcile your books in iBooks.app on your Macbook with the books registered against your account in iCloud, and some conflict is causing it to go a little mental.
Something I'd try is closing iBooks, killing the BKAgentService, then renaming the following two folders and re-opening iBooks. This will relaunch BKAgentService and it should start to sync your library from scratch.
/Users/YOURUSERNAME/Library/Containers/com.apple.iBooksX
/Users/YOURUSERNAME/Library/Containers/com.apple.BKAgentService
answered Jun 11, 2016 at 23:41
That looks to me like a problem with iCloud. (com.apple.bird is a process of iCloud.) Try logging out of iCloud and see if that helps. If it helps, try logging back in and see if that breaks it.
I had the exact same problem, but a simple restart fixed it.
