Tip No.1 Cycles Boost.

If You using CUDA or Optix turn off in Addon tab - settings - Cycles CPU rendering ''off''.

Installation:

Many plugins do not work when we update the blender even one version higher.

Here, the possibility of avoiding this problem comes to the rescue (for Mac, Win users). 

1.)Go to Edit - Preferences - Save&Load and uncheck Load UI:

2.)Second Open Modded Blend file Profile (Cuda, Optix or CPU):

3.)Go to File-Defaults - Save Startup File

Everytime You open Blender 3D, Cycles Boost + AI Denoiser will come with.

This Way it's will work in all versions  Blender 3D and for Mac and Win users.