I am having this problem too. I am using linux and I updated from 0.25. I use an i7-4702MQ with Intel HD4600. I know that it is not exactly a high-end pc for gaming but in 0.25, with tons of mods (RemoteTech, Interstellar, Mechjeb, DeadlyReentry, FAR,Environmental Visual Enhancements , life support, KAS, InfernalRobotics, HotRockets, ScanSat, realchute, alarm clock, etc, etc) I had an slightly better performance than the stock 1.0. In 0.25 stock it worked just fine. I am also noticing that, flying a plane, if I look to the sky, the game works super smooth, if I look to the ground I have a massive FPS drop. I am using medium settings without AA.