A good way to reduce sim-speed drops caused by large conveyor networks.
Simply make this mod Vanilla:
6-way conveyor blocks, and/or excessive use of them slows down the game, so simply allow people to use conveyor blocks and tubes that don't mean they need 6-way blocks all the time ( for structural or aesthetic reasons ). T-junctions would be a God-send, as would solid blocks with only 2 ports on them so that people can avoid holes in their structures or unnecessary use of 6 way blocks when a 3 or 4 way block is what they really want.
Please also fix the colour mis-match on certain conveyor tube tips.