any Help please?

on the 750m GPU 2,8ghz i7 rmbp  and iMac AMD 295x GPU 4,0ghz 5K that we have in the office, autocad LT 2015 desktop subsciption uses less than 10% CPU...what is wrong in this cenario? is it the subscription version of 2015 LT? is the AMD GPU? i need help...