Just a guess:
The Activities section displays numerous flow fields. Their calculation theoretically may take too Long when the SQL Server does not find a selective key according to the calculation formula. It could be necessary to create additional, more selective Indexes.
Another attempt: Did you also move the SQL Server? If so, there are no SQL statistics (or the old one may be damaged) and the application may run faster once a statistics are created. But honestly, I am no SQL Server expert at all, so don't rely too much on my idea ;-)