question about fps

So my question is why am i getting low fps goes from 32 -0. My laptop are System Model: Alienware 14 BIOS: A09 (type: UEFI) Processor: Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz (8 CPUs), ~2.4GHz Memory: 8192MB RAM Available OS Memory: 8074MB RAM Page File: 6282MB used, 3070MB available Windows Dir: C:\Windows DirectX Version: DirectX 12.

My graphics nivida gt 750m. i should be able to play this game on high easy but even when i spec it to the lowest it still runs the same. so low medium or high nothing really changes please help thank you guys