@frazashfaq11 it also seems that you are suffering from slow server initial response time. I would suggest looking at that as a priority too, this can often counteract any work you are doing to optimise the speed of your site.

What hosting are you on? Is it shared hosting or a VPN?

@jh_offlimits as you can see here and from your own research, it's unlikely that you'll get a clear answer to this question. As with many SEO related questions, the answer usually starts with "Well it depends..."

It mostly depends on what your reasons are for doing it. Take a look at this article for more info about follow vs nofollow.

Another factor that might be worth considering is if the social links are the only external links on a given page or a site. Adding nofollow to them may not be the best idea...

"Nofollowed links are also part of a natural link profile and a site with no nofollowed links looks odd." source = https://www.searchenginejournal.com/when-to-use-nofollow-on-links/

...you could always link out to somewhere else with a "dofollow" to balance things out.

See this old thread for more thoughts about that.

Also think about the anchor text of those links and how/if that may affect things.