Yes, the issue you are describing is exactly what is happening. With these plugs inserted, and my buffers set to MAX (2048), ? >?k >? 4up the CPU meter about 4 times more than what DreamVerb does, and about 5 times more than Cambridge. That's causing an overload, as you say.
Why it took me by surprise is that the CPU meter in this instance was below 60%... but still causing CPU overload.
Nuendo 2.10.10
Dual 1.42
OSX 10.2.6
1 Gig Ram
ULN-2 1.4.27
2 UAD Cards with 3.3.1
[ January 04, 2004: Message edited by: mmallett ]