Hi,
The detail of USB lane mapping on AGX Orin developer kit is stated in
4 USB cameras using same USB Bus - #3 by DaneLLL
If you have made use of the type-A and type-C port on the developer kit but still cannot achieve target performance, it may be due to concurrent access of the multiple devices. Please consider the suggestion from other users to use PCIe switch for utilizing PCIe bandwidth.
And if the USB devices requires significant power, we would suggest supply the device with external power supply. Power from the embedded hub is 2A in total, for all connected devices.