The less text/objects you have on the screen, the less lag you will have when using Bumps.
Instead of using large shapes for floors/walls or whatever that are going to be "Bumped" into, just make a text outline of the shape you want.
Then use a trail to fill the empty space in The shapes outline.
Then hide the text with colors or a percentage of invisibility.
I made this post because I noticed pretty much all 2D platformers made have varying amounts of lag and hopefully this post will help someone thinking of making a 2D platformer type game.
I made a 2D platform game/level that runs fast without lag because I hardly have any objects onscreen to bump
That would be too much to discuss though