I was playing a multiplayer game yesterday and had a very large fleet in a single group.
I ordered them to all jump together at the same time between planets.
Half of the fleet jumped normally, and the other half... to my suprise, just started flying to the planet at their normal rate of speed.
As you can imagine this took an extremely long time for them to reach their destination.
I shared intell with guys I was playing with, so they could see what was happening.
-Avarice-