Windows Client Sync / Checking for changes

My Windows and Mac clients keep scanning the whole server for changes on launch, this is causing us issues as there is 160GB of data spread over many thousands of files and folders.

Am i missing something or is it supposed to do this?
As it can take hours if not days to check all the data?

Bump. Have you found a solution to this? Its been days for me and file syncing has not even started.