Disabling out-of-map rendering in Rocket League

I am trying to play Rocket League on a core i7-4610m, 8gb RAM, and a SataIII SSD. I struggle to get 30 fps consistently at 720p. My display is 1080p. I have asked Psyonix, to no avail, to make a checkbox to disable rendering outside of the field. There are hundreds of background objects, some even being animated, that take up a large chunk of processing power. If I could disable rendering of them, I could probably get 45+fps at 1080p. Wondering if anyone has any idea how I would do that.