Any information about better performance with modern systems.

Hi there!
As you know the game won't optimized with multicore CPUs.
I'm trying to reach better FPS in Dalaran or Ogrimmar so I want to set process affinity, but don't know which number is better for me.
I have Intel Core i7 5500u, it has two physical core and two Hyperthread for each core.

its like:
CPU0: core1 CPU1: its thread.
CPU2: core2 CPU3: its thread.

what do you think about it?
as a matter of fact a lot of system and background processes are working with CPU0.
is it good to let the game run just with CPU2 and CPU3?
or maybe set it on two physical cores... CPU0 and CPU2?
I tried both of them and collect some data but they are somehow more complicated from easy comparison because FPS is changing continuously.

If anyone of you have better methods to reach high FPS pls share it.

Dude... You want them to re-write game engine? Seriously? If you are ready to give tenth of thousands dollars/euros - feel free to do so and ask for such optimisation (and BTW, Intel 5th gen is no where close to be called up-to-date).