Turning off rigidbody2d

Hi! I've been making my game for the last week or so but I didn't realize I'm having such a huge fps hit until today when I turned on the fps counter. Anyways, I'm trying to turn off the Rigidbody2D.simulated but no matter what I do, it's not turning off the simulated tick mark in-game. If you knew of a way to just out right remove the rigidbody, that'd also work cause I don't need it. I've seemingly tried everything I could find on google and youtube.

Here's my code that I've tried:

Code (CSharp):

1. //Manually entered in the inspector as a prefab
2. public Rigidbody2D thisRB;
3.  
4. //Later in the script after things are done doing its thing
5. thisRB.simulated = false;
6.  
7. //I've also tried destroying it
8. Destroy(thisRB);