In the challenge that brought this issue up, the major change I saw between running at 4x and running at 1x was how long three squads of fighters survived, and how many cruisers those fighters destroyed. At 1x speed the fighters got swatted out of the air almost immediately, only destroying one cruiser. At 4x speed the fighters destroyed 4 cruisers before being destroyed.
These fighters were fast, but not crazy fast, I think their speed is 2.3 or so. Regardless, their speed and the speed of weapons hitting (rockets) them seems to be the biggest variable.
As far as consistency goes, I ran the challenge 3 times at 4x and got almost identical results each time: 20% Alliance, 6% Empire.
As I understand it, others weren’t getting as consistent results, but were still pulling empire wins every time. At 4x they reported somewhere around 0% Alliance, 55% Empire.
Anyone interested in doing some scientific research on this one?