Technical Help needed

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Hi all,

I ran my site through Google’s PageSpeed Test and came out pretty low. The main opportunity listed was to remove unused Javascript. 

My guess was that it’s referring to all the code & files left over from the many apps I had tried out & later deleted. So i tried to delete some files that were from apps i deleted before. But I ended up messing the website up so I reverted the changes through to a back up copy I had made.

I also ran it through GT Metrix and ranked much better. But it was suggested to ‘Minify Javascript & CSS, Reduce DNS Lookups & Leverage Browser Caching’

I’d appreciate any help I could get regarding these technical suggestions. I’m not sure if I require a Developer to look at it or I can do this myself.

If I do require a Developer to do it, I would appreciate if any of the Experts or Developers will be willing to able to do it. Please DM me and we can discuss further. 

If I will can do it myself, I’d seriously appreciate all the help any of you can offer.