Can not go above 15 - 30 FPS

Hi guys, So its been 2 years I have been waiting so the emulator is stable enough to use.

But I still can not go above 15 to 30 FBS in game.

My CPU and GPU are not even 100% in use So I am not finding the issue here.

I am trying to play Infamous 2(BCUS98125).

Here is my hardware 
CPU: Intel® Core™ i7-3820 CPU @ 3.60GHz  3.60 GHz
RAM: 12.0 GB
GPU: NVIDIA GeForce GTX 1070
Windows: 10

My settings 
PPU Decoder: LLVM
SPU Decoder: LLVM
Enable SPU loop: true
Block: Safe
Thread:6

render : Vulkan with shaders:low



Am I doing something wrong here ? is there any additional settings I could improve the FPS performance?