To Thunderfoot,
If your production capabilities increases on the planets where you build your military projects it will decrease building time, cash is a factor in lowering building times.
If you just rack up military spending too 100% you might not see the decrease in building time, since you have so little social projects that enchance production on planets (or tech, modules) that it will simply not build more (read faster)
For example : if your planet can build a 'colony ship' in 20 turns with 50% military spending and 15 turns with 60% and 100%
That also explains that more cash is not used on the planets to build things since the maximum production is already archieved with 60% military spending.
If you leave this on 100% your expenses grow faster when you get more and more social projects and techs, anomalies, sb's that increase production.
100% military spending just means that the project building will get the maximum amount of cash needed (if it needs more it will get more)
This usually only happens in the begin of the game, when you still have to build alot.
So the military expenses and the other sliders might not have much effect in the start of the game.
I hope I explained it correctly or else the Stardockian ppl can correct it
~SDC~