Double check for CPU spikes in Developer Mode.
Often with a new update, you just need to recalibrate your LOD settings for your CPU.
With the new vegetation sliders, I suspect CPU utilization will need to be recalibrated for many, if not most users.
Level of Detail and Traffic sliders impact the CPU more than the GPU and an overtaxed CPU causes those trademark stutters at or near airports.
Check this thread for some further guidance. But remember, the beta has vegetation and tree sliders which likely also tax the CPU and they may need adjusting, too.