AICreateSimobject + Performance

Quick questiot: I'll do my own tests, but wanted to know other developers opinion on the subject first.AICreateSimobject calls and pretty much all of the AICreate* calls seem to 'pause' the sim for the time an object is being inserted. it is a VERY short pause, like a mini-stutter.If I 'batch insert' a high number of objects, say, 20, while iterating the sim completely 'freezes' (for 2-3 seconds) my understanding, was that Simconnect and FSX have asyncronous communication and that this kind of 'object injections' got queued for batching and should not 'pause' anything...are this pauses 'normal'? what would be the root cause for them to happen?