(its not long and hard to do i promise)

Go to options >graphics>resolution scale> TURN IT DOWN TO 33.33> restart your game


Now everything will look a bit fuzzy but you get used to it eventually. In my testing, I have gone from 15FPS up to 60 on an 8-year-old laptop.

If you would like to get even more fps, turn shadows and shading off. Turn anti-analyzing to low and view model distance to low. Make sure you set the weather to rainy or overcast to get rid off my more fps destroying shadows

Also when you are making a new unit I would recommend freezing the game (you can do this with alt+mousescroll so you get even more FPS.

hope this helps.