I've recently hit a problem when using SQL Compare (which was logged as request #322451).

I am reasonably sure the issue is with the database, not the tool, but when using debug logging, there's just not enough information to understand why it gets stuck on "reading object text (99%)" for over 20 minutes for a specific database, yet is very fast on other similarly sized databases.

Some additional logging during the comparison phase might help to work out why this is happening.