Cinematic sequencer movie capture is awful

So does this work or not? And if it does work, what’s the trick? I have a simple camera pan that I want to record as a movie. The result is a skipping/stuttering mess. The scene is very simple and it plays fine doing a dry run. But recording is a no-go. The computer I’m using should have more than enough horsepower for this. Is this hopeless? (4.18)