That is my Dell E7440 creates with this stick reproducible on all USB ports maximum 120MB / sec. On another computer do the 190MB / sec.
That may now complain at a high level, but it shows that in this speed regions far from any hardware plays along. So it was probably at Dell believes that an increase from USB 2.0 to 3.0 with 20MB - sufficient> 120MB. The revenge now with the fast Devices SSD and the new USB sticks.