Prior to update using a 60hz refresh rate and vsynch enabled, I was getting a steady 60fps and everything was super smooth whilst flying in default and Mariana`s scenery. Updating to version 2.7.18.30765 has resulted in my frames per second dropping down to 40fps or less at times which is now obviously leading to "stuttering". To get the sim to run smooth i now have to set my refresh rate to 30hz, and although my frame rate is now steady at 30 fps and graphics super smooth, due to the lower refresh rate i now get slightly blurred scenery. Prior to the update, windows 10 had not had any updates and video driver had not been updated and no changes had been made to my DCS setting. So, to summarise with everything working fine and no changes to my DCS settings simply updating to the above release version has caused this problem. I did try updating my video driver to the latest release, but things are still the same. It would seem something in this update has affected the 2D graphics performance. I have looked on the forums and cannot see anybody else having graphic performance issues since this update. I hope it is something that can be addressed in the next update since i am not enjoying my flying so much now.