Hmmm. I don't see it. I made a one second clip of a bar moving right, and a two second clip of a bar moving right and left. When triggering both of them at the same time, I can see a slight difference, but they stay perfectly in sync. Nothing like the quarter second delay you mention.
We'd love to fix it, but can you then show a screen record of what's going on? We need to see it before we can kill it