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.
Why not? I've tested right now and it works by blue belts at speed 60 items/second, no gaps, no lags.
yes i realized that it was the factorio extended belts with 240 items/s that is no go... probably limitations in factorissimo. not your mod i believe.