Crom

Follow-up: Bill crashed the first rescue craft when he tried to test this cool concept called "aerobraking" and got it horribly wrong, but fortunately Bob was up to the task and after re-building the rocket, he managed to land within 400m of Jeb's crash-site. After a short jog, Jeb is happily on-board and the pair is currently orbiting Duna, only 99 days until they can start the return trip back to Kerbin and we'll be able to get some good data on space-suit durability during the atmospheric re-entry.

Jeb is sitting alone on Duna after he underestimated on how much fuel you need for landing stage. Good news is that explosion of the return stage softened the impact and Command Pod touched the ground un-damaged, bad news is that Command Pod is only equipped with a parachute and thermometer, neither which help getting back to Kerbin. Rescue mission is already on the way, Bill is coming to get his buddy with additional seat bolted on the side of Command Pod Mk1.

Try removing all mods, I tried to use Mechjeb to compare some of my rocket designs and it killed my FPS, making it completely unplayable. At some point, it becomes pointless to add more parts and features because game performance is handicapping your designs and large space stations are impossible to build for vast majority of people. I'm running 3570K@4,6Ghz and already at 500 parts the FPS drops down to single-digits.