Great guide @petter and a nice addendum to your Bubble performance ebook The Ultimate Guide to Bubble Performance - the new edition is out (now 210 pages!)
One question I’ve been wondering about – whether reusables do or don’t reduce the # of elements on a page, and in turn impact performance. Say for example I have 5 groups on a page and each group is the same. I could convert these 5 identical groups into 1 reusable element that I place on my page 5 times. Does Bubble now just load 1 group (which should result in a performance improvement), or does it load the reusable 5 group times (implying no performance improvement).