Lag on medium laptop

So i have an acer Aspire ES15 8gb ram ddr3 GPU Nvidia Geforce 920mx 2gb CPU intel pentium quad core 1,6 ghz ( boosts to 2,5) and i hit a max of 30 40 fps with drops on very low , while on my old pc 4 gb ram CPU intel pentium dual core 2,7 integrated graphics card it hits a nice 60 fps all time , please help me, do i just have a very s*it laptop or i just didn`t set it up right P.S yes i am runing the game with the Nvidia card at least i think i do.
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