Ultimate Starcraft 2 Optimization Guide ((CPU))

I skimmed the topic but didn’t understand what to do.
Tell me, if I have a xeon with a low clock speed, how do I get starcraft 2 to use at least 4 cores?

Found another theme like this Patch/guide for CPU speed FPS (If you play competitively click this) but it is like the same thing

I tryed set cores and high priority but it isnt help.
What helped - graphics setting effects and physics to low. Now it is more fps even on dead nights.