Long loading

I use the Albizia by ITX.

Now that it is up and running, I have gotten rid of any excess widgets and such, to ‘lighten’ the load.

However, it still takes almost 16 seconds to load the website.

Any ideas? Do I have to purchase pro version, to stop this? Is there something I can put into the coding, that says please wait while we load? Open to any and all suggestions.