When trimming large clip-groups after a re-cut PT10 often beach balls away. This has happened since region-groups were invented an it still does in PT10. No matter how much RAM you have. Setting the undo level to 1 helps but it still happens. Disk-cache on or off doesn´t make a difference as well. There are people who say it´s memory leaking or it happens when you´re out of ram. But this is not the case. On my system it happens when I have 11GB RAM still free (out of 12GB total). It´s been a PITA for years. Please fix this. It´s a very important feature for post.