Well, I was really annoyed with my ship movement last game. I would give the command, the ship would freeze for a few seconds, then teleport ahead.
This game, issue is not there. And I realized that what was causing the problem was excessive exploration treaties. Earlier game I have 20 treaties going on an insane map. I saw some slow down on current game with 5 treaties on insane. As the treaties concluded, ship movement improved.
This was a major hang-up for me. I am quite pleased.