@ Cheap, it's a huge topic on its own... There'll be a minor update shortly, to address some minor
CLS issues. The demo is hosted on a fairly low spec VPS to be honest.
Some things such as 'render-blocking resources' can't be improved upon, due to the sequence X-Cart loads it's javascript.
Unchecking "
Enable buttons "Buy Now" and "Add to wish list" in the products list" in General Settings > Appearance will reduce the DOM size somewhat on the homepage and catalog pages.
You can 'trim' down the template somewhat (CSS & JS) to make small extra gains, but you'll probably need a reasonably experienced developer on your side to make the changes.
If you look at the trends in other ecommerce platforms, eg. Shopify; stores tend to be going more lightweight in content/presentation, in order to get better scores. It's possible to make changes via the reBOOT settings to do the same.
You can search back through this thread, as it's been talked about/addressed before, but in the meantime, you can check the SEO
tips and
links section.
Having had the unenviable task of working with Woocommerce over the past couple months (don't ask), I can tell you that in terms of SEO, X-Cart Classic and reBOOT beats it hands down
I might write a longer article dedicated to SEO in general, as there's so many factors involved, ie. not just the template itself.