My XP64 slave (Quad core Xeon E5420 2.5GHz) runs a VE Pro 5436 template with 8 instances of Vienna Instruments and 3 instances of Kontakt 3.5, a total of 21 GB. While it plays back everything fine (except some hanging notes in Kontakt, mentioned in another thread, but that even happens on a 500MB template), the problem is that certain editing, particularly within Kontakt becomes extremely sluggish, and will eventually lead to crash VE Pro. For example editing midi cc curves in Kontakt. If I just load one of those Kontakt instances there is no problem.
There is still 3GB memory free on the machine. Would this have something to do with video RAM? Or is there any other system setting that could be changed?