It is important to always optimize images on your website to make all your pages load as fast as possible. You should never upload HUGE images which are much bigger than the size that will actually be displayed, otherwise, they need to be scaled down to fit on the page, but the full-size image still has to be loaded.

Kopage is built on bootstrap, and bootstrap includes tabs.If you want to add tabs to your page, create a new content block, then edit the HTML of that block and insert of the following code.