Make a settings screen, where you can disable particles, make the explosion effect just a circle getting bigger and fading out, remove shadows or even disable the whole render system, congratulations, you're running on 60 fps!
Example:
Music: 100%
Sound Effect: 100% (can be done by setting a checkbox to "is sound" or "is music")
LDM: Yes (Disables shadows and some particles.)
Simple Explosion ("circle getting bigger and fading out")
maybe add a egg that does that "disable render system" and when you load a level everything is black and the top left corner will say "FPS: 60" and go back to the menu