#4 Limitation of VL671+vl671.rom USB2HS/USB3 Streaming < 210Mbps

Hi Yifeng Li, Thanks for your amazing open source project !! I have built few boards with VL671-Q4 that I have modified (USB-A to USB-A more compact with enhanced routing for USB3 Host & USB2 HS impedance/length/matching ...) Anyway I'm quite disappointed by the performance of the VL671-Q4 with the vl671.rom firmware blob (https://gitlab.com/niconicon1/vl670-firmware/-/raw/master/vl671.rom) which seem to be limited to <210Mbps to do USB2 HS to USB3 Transfer tested with an SDR with 10MHz IQ 16bits and speed of 320Mbps or even in packing mode(12bits) to 240Mbps in both case the VL671-Q4(with actual Firmware vl671.rom) limit the maximum USB2 HS speed to <210Mbps. Do you think there is something to do to improve the maximum USB2 HS speed (to reach up to 320Mbps) ? (Do you have done some research on the vl671.rom firmware that you can share ?)