It happened the same in my case. Stutters are so horrible, I stopped playing as much. At first I thought maybe my disk is full (SSD get slow when they re full). But I have 60gb of free space. Nothing else changed on my computer. The new patch introduced massive stutters anywhere I fly. I lowered most traffic options, lowered textures, turned off seeing other players online, and fly only with clear skies. Nothing helped, I get stutters to a point it is unplayable. Before I was getting stable 27 fps with higher settings than now.
It is the patch, I am pretty confident.
It must be. It happens at low alt especially. Nothing is maxed out. I thought its my not so fast internet but even with rolling cache or manual cache its there. I think some objects are not optimized. Maybe those new power poles.
Please report your findings to the Zendesk (as I have), and give them a copy of your dxdiag report so they understand your hardware . It’s the best way to get these things fixed. Just because they’re discussed here, doesn’t guarantee that the dev team hears about it with sufficient emphasis.
Besides the stutters I figured I now often get “Limited By Main Thread” in the FPS window even though my CPU (Xeon E3-1231v3) sits at around 50 - 70%. And yes I checked - none of the cores is at 100%, 80% max.