you can play it on low settings on old computer. I was running it on low on a core 2 quad with a cheap AMD gfx card (around $150 that I bought 2 years ago).
It runs on a GFX 840m laptop chip.
My son plays it on a GTX750 3.2ghz i5. I play it on a GTX970 with same i5.
regardless of the hardware, it takes forever to load....
I got a GTX950M in my laptop and a 5500U I7 with 12GB ram and it is crappy haha.
You should try turning off the sky effects, that appears to improve things for a lot of people.