I don't get this at all - you're talking about generating objects - I'm assuming you're talking allocating new objects. What's your bottleneck ? Allocator or do you have some poor data structure to update it ? Where is the speedup coming from ? The kind of speedup you're talking about sounds like moving from allocating each object separately to some arena and avoiding allocator overhead.

I could be wrong in the assumptions - but OP is talking about fitting stuff in CPU cache don't really see how that translates to your scenario.