After upgrading to 9.2 you may find that the first full database sync is taking much longer than expected.
This is normal and is a result of UTC conversion. In 9.2 UTC conversion was added to convert all dates to UTC time. By running UTC conversion you are modifying almost every row in the database. When a row is modified, eSync needs to read and compare it with the equivalent row on the sync destination. All of these reads and comparisons explain the long sync times.