If a carrier is already travelling from one star to another, and while it is in transit a warp gate is built at both stars after the fact, does the carrier speed up the remainder of its travel? Or does the trip have to start with both warp gates built?
Yes, it will speed up.
No it will not. Based on @eDave post above I attempted to save my star this way.
Carrier continued flying at it’s slow pace towards target star despite Warp Gate being build at it’s starting point and destination.
Actually it’s worked. Travel time updated next full hour.
Speed changes at the next tick.