When travelling very fast, minecraft speed stutters, sound clicks and movement appears slowed.

Cannot get to repro in new worlds, only my own single realm world.

In a nutshell, when minecart speed tops out (either by passing 12 or more consecutive powered rails, or by speeding down a large incline (24 or more cubes of downhill progress) followed by three or more consecutive powered rails, speed stutters, and sound hiccups. Please use my realm to repro if needed.