I'm going to tinker with the config file after work today, and see about the extra line spacing. From what it looks like, what it's doing is adding a line before and after a paragraph, not just after a paragraph, which is default in most apps.
For the speed issue, there are two factors at work here. One is outdated java itself. If your java is not current, you will have this issue.
The other is where the files were uploaded after a Word export to html. Most of these inserts are so full of garbage html, it just takes awhile for the editor to strip it out. Because that's exactly what it's doing. Is CLEANING all the garbage out of the html insert. Something else I've found, is that in some of these for instances, there's so much garbage inserted before you even have the first line (often 10 lines of html code or more which do nothing), that it slows it down even further. If you find it doesn't load at all, let me know and I can look at the record. I remove those first ten plus lines, and the chapters load without issue. I know, because I've checked. But, to do this, means I have to go in to the db record and strip it out.