Increase Website Performance
The 2 tools I recommend are https://developers.google.com/speed/pagespeed/insights/ and https://gtmetrix.com/
You can follow Google optimisation tips once they have scanned your site and they will even provide you with the optimised content. You should aim for 99/100 on Google page speed.
On GT Metrix, I aim for sub 1 second page load time for above the fold content.