Make a variable to set quality settings and then use it in your events to control how many objects are you spawning, how many effects are enabled etc.
So for example on your layout they are objects that spawns 100 sprites every seconds. This can make slower computers to slowdown a bit and loose fps.
You could set then
+if variable = "normal"
+ every 1 second - Object spawn 100 sprites
+if variable = "low"
+ every 1 second - Object spawn 30 sprites
I've used something like that in two of my games and it works really nice.