Re: how to change https://www.australiaglasses.com/ to xcart?
Depends on what you want ported. If you want products, orders, customers, etc we could help you transfer that. We can also transfer your look, etc. A lot of it though is process where we'd have to create a script to transfer the data and the look would have to be recreated in X-cart. We've done this for a few clients to X-cart 4.
Usually slowness on the other shopping cart is due to setup and/or server that is not set up correctly.