You have a lot of images on your website, and they usually take quite a while to load. Even worse if someone were trying to access your site with their mobile phone on mobile network. It’s in the nature of things.
If you want to speed your site up for low bandwiths, you might want to consider a different concept of how your site is built. Or, if you want to keep things the way they are, you’ll just have to accept long loading times on phones.
Of course, images are only one of the things that slow your site down. If you have a lot of script-heavy plugins, if you need an awful lot of javaScript, or if you include scripts or fonts from other websites on the internet, your website will be slower each time you add a thing like that.
