Is There a Major Change to the Super Editor?

I'm refactoring a lot of the layout widget api so that you have more control over document styling using style rules. And i'm manipulating how information gets into the layout, which should lead to some performance optimizations. We ar we have some known performance difficulties at the moment - but they're not bad enough to be a priority to fix. But we know they'rethyre this change that i am working on now should address at least one area of those issues.