Dope sheet performance

Hi everyone, I'm not sure where to post this since it's not exactly a bug or anything but today I noticed that the dopesheet is having a big impact on performance when animating.

If I press "spacebar" to play my animation in the viewport fullscreen, the framrate is just about acceptable. When opening the dopesheet next to it however, I notice a drop of 3-4 FPS.

I don't really understand how rendering a few yellow dots as keyframes can have such an impact on performance.

Has this been noticed by some of you before?