I think you’re confusing frame rate and shutter speed. It’s possible to set both a high shutter speed (to reduce the exposure in bright conditions or to reduce motion blur) and a low frame rate.
I’m not a photographer. What I am thinking of is reducing the amount of light that goes into the lens to prevent the sunlight from whiting out the picture.
It is my understanding that one way to do that is to take quicker pictures, whether that is frame rate or shutter speed I don’t know.