It’s not a show stopper, just very annoying. At least on my machine.
It seems to be a little worse on other systems judging by the video c2d has put together.
Edit: Also, what’s worth mentioning, I’ve updated straight from 8.0.0 to 8.0.3, skipping all the in between releases, so the issue I am seeing may have been introduced in one of the dot releases, for all I know. I doubt it though, since there were no complaints about this since Cubase8 came out.