I know that i am answering my own question (again),but i think i have figured it out.
First of all i have almost all of minimum specs. the ones that i don't have is the processer (i have Intel(R) Core(TM) i5-3340M CPU @ 2.70GHz (4 CPUs), ~2.7GHz, i copyed that from directX).
Is Intel(R) HD Graphics 4000 a good graphics card?
also until i get a 90 Watt AC adapter my computer will lower its performance by a lot when its plugged in.so i have to unplug my computer if i want to get good FPS. (even when its unpluged i don't get good frame rate, but 18 FPS never hut anyone).