Hi!
For me, the biggest difference with the patch was the fixing of the mismatched physical model/visual model gunfire causing the guns to go everywhere
Made the dogfights much more ammunition-economic
I must say I notice little to no improvement in FPS though. Perhaps a little bit when staring down into the instrument panel. This used to be quite laggy, not so much any more. Seems like micro stutters appear when closing in on a new 3D model LOD. Like when the game has to load 5 more detailed hurricanes as you approach them, I get microstutters.
Also when looking around fast at different angles at the ground. Seems like the engine is strained during loading of trees/buildings/Shadows and whatnot!
All in all, I have a very fluid game, but the microstutters and cockpit FPS drop when looking into the instrument panel are still there. Patch did NOT break anything for me. Nvidia drivers 270.51
Specs are in my sig.