My advice:
- if there’s a part of code which you not gonna touch in same event, make a separate script for it
- avoid using too many for-loops in live code. Again - if some part is already completed, move it rather to some script (you don’t need to change code in any way, as it will be run in context of event) and keep the smallest amount in code you want to modify.
I’ve got one object which have around 10 nested for-loops inside, and I’m getting 2FPS cause of it, so above solutions helped me a lot.