Load times slow, editor, payments square

New here. My site is slow. Customers like a quick interface and mine is not quick.  We added all of the services, booking, and products to my page. 

now the extension, square, is processing payments 30minutes of loading time. I have not problem with clearing internet, restarting my computer, every customer order is slow. Go and try to book and process a payment and you will see. 

How can I get my page to load faster?