I don't have vector, my settings are medium low, there isn't any AI and this stutter occurs with the default f22 aswell.
You are correct in saying the cpu is being clogged, and I've already pointed out a solution being a more meticulous graining of the scenery complexity in the package.
I have a few areas elsewhere on the globe where most people can only dream of smooth simming, such as fly tampa toronto, dd nyc with both airport packs and the fsdt jfk, dd chicago with the airports and fsdt ord, tokyo city scenery with the notoriously hard on frames technobrain scenery. All of those areas run like milk.
Socal is the only offender. Please add a scenery complexity config. I'm sure the stutters can be eliminated this way, or by allowing us to control how far away those objects get loaded in. Preferably both.