@Razontex
I want to start apologizing, for taking so long to answer. I am sorry.
I have done what you told me to move the LSPDFR folder from the plugins folder to another place without being loaded in the game. And indeed, the game is going to 63 FPS, at some point to 43 but it is acceptable.
So I do not know what plugins are the ones that make me go to 20 FPS, I'll look at them little by little. And when I have the solution, I'll leave it written here, in case someone helps you.
EDIT:
I have tried the mods one by one, and the only ones that cause my GTA to go to 30 FPS are: Arrest Manager, Police Smart Radio and Traffic Police
Any solution? Or the idea of being able to solve it? Thank you!