Help with Woocommerce on a website

I have a website with 900 items in Woocommerce.

The website backend is very slow when using Woocommerce, espcially when adding items and when I search for products I get a 'page not found error' I also get this error when moving trying to move items to the bin (I have six items that I need to remove). Sometimes the website freezes when people are trying to purchase items.

The server is fine and I have upped all the resources.

I'd like someone to look at the Woocommerce set-up so that it performs better.