However, there is one interesting 'catch' to how Box Sync works. I received this advice from Box Support after making a feature request:
So, at this point, any change in your local mirror of a Box folder will trigger a re-scan. I have around 270000 files amounting to 741 GB syncing to Box. This means the scanning time is quite long and I guess sometimes it doesn't even get out of that loop until I stop touching those files.
The quickest workaround is to use the web app to upload / download if you have a requirement to do something quickly.
I will consider other ways to work around this issue. Any ideas out there? And don't tell me I shouldn't be syncing so much :)