I believe there should be should be 2 settings for Items Per Page. One for desktops (usually with faster connections) and one for Mobile Devices, usually with a slower connection.
I have a site, where I am using your embeds (amazon affiliate) into my WordPress site and it’s a bit slower on the mobile side, obviously. So It would be great to have something to where I could set the number of of items per page for desktop and another setting for mobile, say 8 items per page
Hopefully that would speed things up a bit.