Unreal engine lagging everytime

[solymanali35]

Just installed unreal engine 4 and it's lagging everytime, i shouldn't call this lag, its like if i click on something it respond after 4/5sec. That's not all of it. Even at first, if i click somewhere it works after 4/5sec later and on the option key, it doesn't work, just a small black screen appears,

What is causing this problem?

My spec

I5 6400

16gb of ram

Rx 590 8gb

I'm using the latest versions of amd driver (optional one)

And windows 10 the oldest version

Something from 2015/2016 maybe.

Can windows cause this problem? Or my gpu driver?

At first i though i cpu cant handle UE4

But one of my friend using smoothly with the same cpu and gtx 1060 3gb 8gb of ram.

it happens when i click on something which contain some options, like file, edit etc. 

And if i click on something that doesn't contain any options then It'll work after 4/5/6 sec later,

 

[Phazoner]

How is the drive where it is installed?

 

[solymanali35]

How is the drive where it is installed?

I'm not worrying about installed location,,i installed everything perfectly, in c drive, but i install my old gtx 950 and unreal engine working fine, its not working with my amd gpu,,even msi doesn't show my amd gpu temp, fan speed etc,
what is the problem? is it my gpu hardware or something to do with the amd driver?