Unwritten I have a fix for you. Go to your steamapps/common/nuclear dawn/nucleardawn/cfg/video.txt
Then delete the settings in there and put this in there for low graphics.
"VideoConfig"
{
"setting.cpu_level" "0"
"setting.gpu_level" "0"
"setting.mat_antialias" "1"
"setting.mat_aaquality" "0"
"setting.mat_forceaniso" "1"
"setting.mat_vsync" "0"
"setting.mat_triplebuffered" "0"
"setting.mat_grain_scale_override" "1"
"setting.mat_monitorgamma" "2.200000"
"setting.gpu_mem_level" "0"
"setting.mem_level" "2"
"setting.mat_queue_mode" "-1"
"setting.defaultres" "1920"
"setting.defaultresheight" "1080"
"setting.aspectratiomode" "1"
"setting.fullscreen" "1"
"setting.nowindowborder" "0"
}