I've been fighting this issue for quite some time, searching for advice, but there doesn't seem to be a solution to this.
On my Windows 10 laptop, I'm running Creative Cloud quite extensively, utilizing cloud storage etc. Almost all of the time, the CoreSync.exe keeps synchronizing and employing the processor so that the fan runs constantly. Moreover, while the sync process is on, it seems to block icon display. The moment I kill the CoreSync app, all goes back to normal.
Do you find this behaviour normal? Because it really slows down my work (CPU power AND file organization without icons).
Unfortunately, Adobe developers don't usually hang out on these pages, so you're not likely to get a technically knowledgeable person who can answer your questions here. As far as I know, they don't read these pages and are unaware of the issue. The CPU usage and such have been a constant complaint on these forums, and as far as I know, no one has ever suggested a reason or been able to provide a solution.
I would suggest going to the Feature Request/Bug Report site, selecting Creative Cloud, and either adding your vote to a current bug about this (I don't know if there is one), or starting one yourself.