When a new ship is built, speed bonuses are not applied for its first turn.
Example:
A ship with one impulse drive has a base speed of 3 (1 from hull, 2 from engine). The tech impulse drive gives a speed bonus of +1. (Why does it say +10 btw? And why is it listed in the speed ability as +10%?) When the ship is launched on the same turn it was built, its speed is only 3. In the next turn it has the correct speed of 4.
I'm playing beta 2b.