Power Rail in Realms glitches

When riding in a cart, the trip either seems to bog down with an audio bug (sounds like a looping feedback error) or the trip is actually slowed down by the powered rails and very unsmooth. My tracks are composed of granite with a torch every seven blocks adjacent to the power rail. In NONE REALM worlds (regular worlds) this problem does not exist; everything is smooth. But in Realms, it has been persistent since realms were released.