I am using Nop Venture Theme for my website http://sportsone.com.pk/. My site was very slow in beginning, now after about 10 months, speed is quite better then beginning but its still very slow.

I run a site speed test on GTMetrix and analyzed that some sites are loading fast then mine while those sites have more loading time according to GTMetrix. The reason I found is that the header and main slider of those sites is visible on the first go and the remaining homepage loads after that. But on my site, homepage compiles complete data from top to bottom and then gets visible.

Is there any way we can load our slider and header first within 2-3 seconds and then remaining homepage loads gradually when scrolled down?