iRacing - Cube Maps On/Off. 20S4

Got a 3090. Decided to check out the cubemaps. This is a daylight replay so not the most obvious change ever, but check out the framerate in the top right corner. Same replay, identical graphical settings in every way except with 1 fixed and 1 dynamic cube map enabled on the right. A little better contrast and interior lighting realism, but so resource hungry.