I really think that fleets need to move faster. Right now, I am stuck in terms of speed. I don't want a million ships because losses cost a ton, and larger ships are MUCH too slow in terms of their travel speed. I think I have reached an optimal point with a Hyperion, a Tempest, and a Thunder fighter wing. I only have a speed of 172, and the Tempest and Hyperion both have augmented engines. While each ship has a travel speed of over 200, I can catch only the moderately fast pirate groups. Obviously, it would be the death of me to attack massive groups (although that video on the untouchable Tempest does make me wonder...), and smaller groups are barely worth it. Plus, if I capture a ship, it drags my speed down to around 130 (depending on the ship), and so I have to be extremely careful getting it back to the outpost to sell it.
I am assuming that the "Outposts" (based on the similarly-named unused tab in the HUD) will allow us to drop off ships and supplies, which will help, but I would still love to be able to go faster, or be able to get some sort of "fleet upgrade" that does things like increase travel speed or maneuverability, crew training speed, likelihood of capturing ships, hanger space, and the like. I am thinking it could modify some kind of command ship, but I am straying into another thread here...
TL;DR: Even using only the two fastest ships (with upgraded speed) and the fastest fighter wing (I think), the fleet is way too slow, and you can't add any other ships without tanking your fleet speed.
Even more TL;DR: Fleet size reduces speed by too much!