Yamatai tops at 20 LY/min, which to me is really too much. I cant do a thing about that, but Id like to.
Everyone likes being fast. But this setting has a nice syndrome of "so fast its really goddamn stupid". This is, of course, not your fault, but submissions like this certainly dont help it. Why, WHY, does every ship need to be able to travel across the entire known IC universe in under 4 minutes?
The best thing that ever happened to this setting was the halt on super-weapons and uber-speeds. It came too late, but it was a massive improvement to what was happening. Submissions like this (and the DD4, and other recent NAM subs) threaten to start us up all over again with that kind of thing.
A playing experience isnt ruined by one ship being faster than another. But right now I think the only genuinely interesting plotship would probably by Yggdrasill, because its the only one that cant span the entire universe in the bat of an eye. The DD4 can travel across known space in 3 minutes, the Sakura in 4. The Crataeis in 11 or so, the average military vessel in 10 to 15. Its sheer mental masturbation having speeds like this on everything, and exceeding them as NAM seems so keen on doing just goes to the point of shallow, pedantic pissing-contests.