Real world elements that impact speed - in zwift also?

does road surface or choice of kit impact speed in zwift?
only place i notice it is in London, the last 1/10th of a mile coming off the red before heading onto the main circle. always feels like quicksand to me (probably in my head).
haven’t changed my kit since first level up, so no idea on that (Green jersey, bald, no socks, helmet, gloves, or glasses).