Hello to everyone ! I need some help with the Kinect using RPI.

I used a RPI 3 model B and i connected the kinect, with external power supply. All works great, but when i tested the USB transfer speed, i noticed that the speed was ~20MB/s, when in my PC, the speed is 27MB/s. Anyone knows how to improve that speed ?

I also tested using RPI 4 model B, but the USB transfer speed was worse, I got 15MB/s only.

Thank you very much for your help.