Need to speed up site

I just redesigned a site for a client and used wordpress as the cms. The site is nothing but page after page about different items with a pic or 3 for each.

https://www.allachporcelain.com/wp

I installed a caching plugin which made a small difference but its still really slow. I checked the site speed on https://www.webpagetest.org/ and it seemed to think the speed was decent. I am not really sure what is going on.

One suggestion I got was to put the site on an ecommerce platform which is meant to handle tons of items like this. Problem is that the guy who will be using the site and adding pages in the future has the computer knowledge of a squash. Even wordpress is hard for him and its about as easy as it gets. Plus I dont want to have to completely redesign the site again!

Any suggestions to get the current site loading faster?
Thanks for any help.
K