FPD + Woocommerce with over 1000 variations

Hello.

I'm working on a site where the client does framing.

I'm having issues with speed on a few products. I think some of it is down to how woocommerce queries variations but I want to make sure the way I have set these products is the right way.

If you go here https://www.artsylaser.co.uk/product/photo-frame-landscape/ you will have to wait a while and you will see they have size, frame type, frame colour, mount colour. 

I have a FPD product which as a default frame, mount and upload area. then each size, frame type, frame colour, mount colour attribute has the relevant elements which replace each other when selected. 

Is that the best way of doing it for page speed in mind ?Or am I missing an easier more efficient way ?