When I get a slow PC occasionall, sometimes I see insync over 99% on top, so I kill it and restart it nice -19. Consider making insync nice -19 all the time. Soms apps actually do better nice, as they get larger timeslices.
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Hi @David_Pickett,
Thank you for reaching out! 
Could you send your log files to support@insynchq.com with the link of this post? We’ll need to investigate what’s causing your CPU spike.
Hi @David_Pickett could you copy and paste their response here? I’m noticing a similar issue with ubuntu but mine is hard to reproduce. Thanks