What does the game speed affect?

[Nats]

What is the difference between playing on Normal and Endless for example? Does it make the techs go slowly etc? Assume it doesnt affect ship speed? Why would you pick Endless above a faster speed?

[MTB-Fritz]

Population growth
Outpost transition to colony
Reasearch time
Production time

Thats what I noticed so far

[Longbow]

Everything takes longer except unit movement. The game lasts longer and this should also effect on turn limit.

[Astasia]

Originally posted by Nats:

Why would you pick Endless above a faster speed?

Some people like longer games, which is why game speed is an option in pretty much every 4x ever made. The main draw is having more time to do stuff before you tech out of it, and often it's only research speed that is effected.