How are you selecting which documents should be synced, with a Collection? Have you double-checked to make sure it is still set up the way you expect, both in the list of items itself, and the setting to use that list?
As far as I know, the status bar during sync has always printed the total possible count, even if only a portion of that count was being actively analyzed. So in a project with a sync collection set up to 10 files out of 700, I would still see “700” in the progress bar, but the bar would only halt and check ten times. Would you say that the thirty documents are processed more slowly, or that 1,000 documents are being processed?