I've found that it helps to reduce the Default Preload size in VIPro settings to the minimum that will work with the piece at hand. This fixed most of my glitch problems.
Yes of course.But in a former Posting Paul recommended for Synchron-Strings not to use the lowest Preloadsetting but only 8192 to ensure no performance problems with "insane tutti-chords".
With 1536 I would presumably have no problem to load the whole Synchron-series to come. But if I understand Paul right, for not to "insane" regular use 4096 or even 3172 Samples Preload might work aswell. However his list of alternative performance optimzation is still interesting whenever any hardware resource runs short.