I've seen/heard this can be done in several videos I've watched, most notable Scott Manley's videos, as a way to reduce lag during takeoff when the rocket is at it's laggiest. He used some addon or mod to slow the game clock down to 1/4th or 1/8th time and then everything worked, albeit slowly. Lately I've been trying to build entire large bases and launch them to the stars, but with the lag they generate, there's no way. Thanks in advance!