By default, all things being equal, it shouldn't be taking longer with 2008 SSMS. So, you have to figure out what's not equal. Again, are you capturing an execution plan? Do you have different connection settings, the ANSI settings? There has to be a difference somewhere.
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning