Website Opening too slow

Hi i am using Nictitate Version: 1.0.9 ( free version ) with wo-commerce and some other plugin.

But is opening too slow

I tried many solution ( like w3cache , css , image optimize ..etc) but still opening too slow .

Website Link

Please let me know what is problem . as some one told me the theme which i am using is creating the problem .

link for your support forum : https://kopatheme.com/forums/topic/website-opening-very-very-slow/