It’s not a bug but it bugs me. The game needs more GPU power to render it’s menu at 60Hz than rendering a fight with two teams at 85Hz. It doesn’t add anything to the user experience but noise.
Ironically, if you have texture quality set to low the textures in the menu background will also be low quality, rendering all that rendering essentially useless cause it will not look good.
Why not play an ultra quality video as the background, it doesn’t make a difference except that it will actually look better on a lot of machines and use less system resources.