I am suffering the same problem on Macbook Air mid 213. even when i tried reducing the download bandwidth to 25% it seams to have no effect. If core sync starts it consumes the whole cpu... Core Sync taking up 100% when syncing files causing cpu fan to run at full draining battery at a very high rate once sync has started the cpu does not decrease even when sync is paused it has to be force quit as a process to stop I have now disabled syncing of files and now use dropbox as an alternative. Dropbox works very well so i know its a not a fault with my machine. Please can you sort this as its now June and the problem is ongoing cheers W.
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