I'm with you on this.
I'm firmly in the camp that suspects that many of the familiar stutters that have plagued ED games (since back in the LOMAC days!) are related to the sound engine.
Rockets hitting the ground, bombs exploding, an aircraft being hit, contacting ATC, ejecting, crashing....all these events, at least the first time you encounter them during a session, cause DCS to stutter. They have at least one common denominator - they trigger a sound file.