Guessing this is due to floating point precision issues, but once you fly very far away in the ship designer's testing mode ships and all jetpack movement slow down to a crawl beyond a certain distance, and the UI turns, for lack of a better phrase, hilarious:
Steps to Reproduce:
1) Create any flight-capable ship in the SSD
2) Fly far away from the starting station
3) Observe weird side effects and UI issues.
Steps to Reproduce:
1) Create any flight-capable ship in the SSD
2) Fly far away from the starting station
3) Observe weird side effects and UI issues.