Editor is embarrassing

[mikeloc]

FYI… folks might want to give this new experimental feature a shot.

[Experimental Feature] Edit-mode performance enhancement

Hi all, We just released a new feature to the experimental settings panel. This feature is designed to help out editor performance for large pages containing lots of hidden elements. The way it works is by not rendering or allocating any memory for hidden elements in the editor, similar to what we do in runmode for elements not initially visible. In our performance testing, this has reduced memory usage drastically, especially for very large single-page apps - one page I was testing went down f…