Since Version 6 of Vegas Its a pain to edit drums!
If I edit the grouped Drumtracks after 300-400 cuts it needs a long time to resize events!
In former Versions there was no problem - you can cut your tracks 1000-2000 times without this problem.
I checked this out on different machines, and had the problems too...
I use Vegas because its the best Programm to edit drums and vocals - it has the best workflow for me! - But with this bug its nearly unusable for me...