There are rigs in this section to make your afterburners and microwarpdrives burn longer

Speed-freak: For those of you who can't get enough sro gold speed, there is a whole section of rigs just for you. The astronautics rigs do everything from simply giving your ship a 10% higher max velocity or 20% max warp speed, to increasing ship agility by 15%.

There are rigs in this section to make your afterburners and microwarpdrives burn longer, use less capacitor and give you a larger speed boost.

My personal favorite, however, is the Polycarbon Engine Housing. This rig decreases the mass of your ship by 15%, which has the effect of increasing agility markedly (although the exact percentage is unknown), and increasing the speed you get from microwarpdrives and afterburners.

It's effectively two rigs in one, though it may yet be nerfed due to the current over prevalence of Battleships using inertial stabilizers and this rig to reduce their mass so much that they are as fast and agile as Interceptors.

While it's not speed related, this section even houses the Cargohold Optimization rig, which increases your ship's cargo hold volume by 15%, a whopping bonus to any hauler.

An interesting side-effect is that installing a full set of Tech II or local hull cargo expanders and a single cargohold optimization rig on a Dreadnought, pushes its capacity to well over 50,000, allowing it to hold a repackaged Battleship in its hold.