Actually I would say a lot. Look at this image. Dimensions are the same, no visible quality loss, compressed from 921kB down to a paltry 45.9kB or 95%.
Single page sites with lots of animations will usually suck performance wise. I think you will find that most people won’t wait for page loads. Why do you think Webflow killed all the “cool” animations they used to have on the main site? I’ll bet it was performance and engagement. Anyway that’s just my opinion. Good luck with your project.