Programmable Receive Buffer Timeout
In the previous device, the receive buffer timeout used to flush remaining data from the receive buffer was fixed at 16ms timeout. This timeout is now programmable over USB in 1ms increments from 1ms to 255ms, thus allowing the device to be better optimised for protocols requiring faster response times from short data packets.

Ну вот и запрограммируйте, сколько нужно.