I don't mind the upgrade "procs" being a bit hidden, it makes it fun and surprising to discover them, it gets easier to get them with the bottom shop upgrades. I do agree that the damage to projectiles behavior, wording and color code is a bit confusing tho.
I'm sorry you had performance issues, I have no idea how to replicate or fix it, in my experience even on a very low end PC it should run fine :/