Sync with Toodledo very slow

I am evaluating this software.  I don't understand why it takes so long to perform a synchronization.

Does the Ceptara sofware index the outlook data file?  Is it indexing more than just the "tasks" component of Outlook?  There appears to be some sort of syncing going on, but it only adds a few tasks each time I sync.  I've been at this almost all day now.