I installed the jch-optimize plugin, the site at the beginning is always very slow

www.arredamentiloiacono.it

Friend, your site has lots of pictures, but it's not that heavy. What you can do is treat these images to reduce their size.
Have you looked at the google webmastertools tool what can be done?

It's not slow navigation but slow to open the home. Once you reach the site, browse fast.

That's right, my friend, once you load the site into the cache the navigation gets really fast. At first access to your site is really time consuming, I think because of the images. But just checking it out, I'll try to get a better look at your site later. Hugs

Friend, did you install the plugin I told you to install? Well check your site in PageSpeed Insights and your site is heavy. Some things should have been healed with the plugin, but I do not think you did.

Here's how to fix it here:

developers.google.com/speed/pagespeed/insights