I don't get any lag around KSC at all, but if I fly a spaceplane mission hdg 90 degrees from there, I get hit with a massive lag spike no matter what craft I am flying, my fps instantly halves a couple of minutes after take off. Then when I get higher in my ascent the lag suddenly goes away. The only way to fix it is doing the ocean config edits and setting half res textures. It's a problem I can live with. My system is an FX6350@4.2, 16gb ram, 6950 2gb. I first noticed it 0.18 and it's still the same in 0.21.1.