are you talking about a MST Hub when you say DP Splitter?
Make & Model of your laptop or PC Computer information?
Do you know which type of USB-C you have?
ThunderBolt Ports have a higher transfer rate then USB-C: https://www.pcmag.com/news/thunderbolt-3-vs-usb-c-whats-the-difference
Today's Thunderbolt 4 devices let you transfer data at up to 40Gbps—twice as fast as the 20Gbps maximum throughput of today's fastest USB-C ports, and four times as fast as the original Thunderbolt interface.