How to get rid of ugly rendering artifacts?

Hello there.

How to get rid of ugly artifacts specially for fast moving objects/actors?
Attached picture shows what I mean. I rendered it originally to AVI without compression and these artifacts are there. Actually such artifacts are quite present all along the movie but it gets really bad sometimes. Final movie -> Galton Board (Bean Machine) simulation - CGI - YouTube

And now I’m curious if my video card can be the culprit? Anyway how to fix? Clues?

Thanks !

Try adding a delay between each frame to let all these effects settle down

you could try movie render queue