Website takes too long to load

In short, you have a large number of high resolution images.

Sites like GTMetrix give you good insights into what to do – https://gtmetrix.com/reports/ongidesign.com/w9WDL9sC

I should also note that you have some very slow/heavy plugins in play. There are optimization instructions out there for WooCommerce, so look into that. Also, contact your host as they might be able to help you. I think revslider is also a pretty slow plugin so if you don’t absolutely need it, I’d recommend dropping it.

And I see you are using Visual Composer and add-ons, that’s also a slower performing builder in my opinion.