Сhanging speed of belts. Every next belt tier has twice higher speed than tier before. Now splitter splits one blue belt to two red belts.
Krastorio has some "Superior Belts" that by default are 60items/sec .. with your mod they would be twice a blue belt.
Yes, default tiers are 15, 30, 45, (60 etc.) and this mod has tiers 15, 30, 60, (120 etc), twice more than before.
added support for Krastorio