The "Features" page is the worst performing web page I have seen in a long time. Loading 14+ MB worth of images, spending over 11 seconds on loading fonts, loading the same script multiple times. All that for just a static web page with some video embeds and a comment section is quite astounding to be honest. Makes me not want to check out their product.
Well... :D You can't add the gained time twice. It is like saying, instead of spending 20 USD on coffee, you spend 15 USD. You didn't gain 10 bucks, you are still left with only five more than you would have otherwise.
Kickstart.nvim [1] is a good starting point. One big Lua file which gets you 90% there and shows what’s possible while making it easy to change/add stuff and getting started doing your own config.