What is the spec of your computer?
How many threads are allocated to each instance of VEP?
How many instances are you using?
VST2 or VST3 VEP connector?
I have one instance of VEP with eight instruments, all Kontakt 5.
I have chosen zero threads because of the low latency.
I have a four processor, 8 thread 3.4 Intel processor with 32 gigs of RAM.
I don’t know about the VST 2 vs VST 3 or where to look to change/ find out.
I think your misunderstanding about threads. You are talking about the buffer multiplier. Threads (in the VEP Prefs) allows you to tell VEP how many of your 8 threads to use. I would suggest at least 4. See page 13 of the VEP manual.
When you load the VEP connector in the VST rack, are you loading the one with /// next to the name?
I use VEP with N6.5 and it works like a charm. Reduces the CPU load substantially, even using a VEP server on the same machine, though I also have 2 slave computers as well.
Up the VEP buffers to 2 and keep your soundcard latency as low as possible and I think you will be happy.