Yikes, do yourself a favour and turn off motion blur though it's mainly a hold over from the consoles using blur to hide unsmooth camera turning at lower frame rates. Although the low framerate you're getting it might actually help, at 60+FPS this will greatly improve the image though just an FYI. Same goes for Depth of field in other games when available
Just a couple wee things mate Volumetric lighting can have a big impact on frames so it's worth playing with the settings on that. Shadow Filtering can also massively impact performance depending on how it's used so it's worth playing with that setting both of those can gain you a big amount of frames especially when you have Scattered Density set to Ultra there will be a lot of objects to bounce light off and produce shadows for
Just a couple wee things mate Volumetric lighting can have a big impact on frames so it's worth playing with the settings on that. Shadow Filtering can also massively impact performance depending on how it's used so it's worth playing with that setting both of those can gain you a big amount of frames especially when you have Scattered Density set to Ultra there will be a lot of objects to bounce light off and produce shadows for