Proper Tier Doubling - Each assembler doubles in speed as the tier increases to allow for halving of ratios and setups per tier. This doubling also applies to belt speed, cleanly going from 15/s to 30/s to 60/s.
No more do you have to figure out 0.75 or 1.25 setups or dealing with wonky 45/s belts!
Double Speed Belts by darkfrei
note this mod was made for me personally, as such I have combined two features together since I could not find another mod that did this so simply.