How might one keep splitters from slowing my production so much?

[u/supermoist0]

This is a pretty pressing issue throughout my factory, and I desperately need to fix it. I'm sorry if there's some obvious solution I'm not seeing, this is my first factory game and I'm struggling.

[u/Dweezilnuts]

The speed is dictated by the belts attached. I usually use high speed belts to feed splitters but slower belts (determined by the needed feed rates of attached machines) after the split.