Hello, @VDinev,
If you check your provided screenshot, you can see that the time is less than 1 second as well. It is already very impressive.
So do not need to worry about it, Your site is fast enough and the best in Speed.
I suggest you to do not add some more modifications in terms of speed as that might conflict with your current score as well.
Hope you can understand.
Regards 8Themes Team.