Until that is a thing, you can use console commands (open console using "~")
these are the lowest settings!
resolution "r.ScreenPercentage 10"
view distance "r.ViewDistanceScale 0.4"
anti aliasing "r.PostProcessAAQuality 0"
post process "sg.PostProcessQuality 0"
shadow quality "sg.ShadowQuality 0"
texture quality "sg.TextureQuality 0"
effects quality "sg.EffectsQuality 0"
detail mode "r.DetailMode 0"
dont lower the settings too much because it has a chance of crashing!
its not very conviniet to use these, but it can help... we hope.