On my PC, the speed really jumped up without the bloom.fx,
try to deactivate the other effects too, and see wich
one causes the framerate drop.

Some small recent games of mine:
Griefer 4k http://damocles11.byethost9.com/griefer4k.html
Kobold 4k http://damocles11.byethost9.com/kobold.html
Cave 4k http://damocles11.byethost9.com/cave4k.html