low cpu load

Greetings! First time posting here. So recently I bought Assassin's Creed Unity on a sale on Steam and decided to play it. But to my surprise the game is unplayable. Low fps around 5-10 , low CPU usage (in Nvidia Overlay, HWinfo64 and Task Manager) around 15-30%, the temperatures are at most...

I am using laptop Zbook 15 with intel i7-4800mq CPU and nvidia quadro GPU. When I run games, the load on the processor is not higher than 30%, but the temperature stays around 70-85 °. While the load of the video card is 80-99%, and the temperature is not higher than 63 °(58° most of time). I...