Most likely your renders are choppy, it’s the playback of your computer. You can check this in quicktime by using the arrow keys to see if every frame has been rendered. Generally speaking most computers can’t playback most quicktimes codecs or uncompressed .avi’s files. Just too high of a bit rate for the cpu’s. If you need to see it compress to a file like Windows Media(pc) or Quicktime H.264.
Also check out this link as it goes into a little more detail: https://forums.adobe.com/thread/684381
Johnny Cuevas, Editor
Thinkck.com
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.