I am now at the stage in my project where I benefit from having a word processor. Accordingly, I tried today to import a large RTF file (190,000 words) into Scrivener. It choked. Even moving a cursor down one line took several minutes. I chopped the file into different files of chapter size (between 10,000 and 15,000 words), it worked—sort of, but it was still intolerably slow. Even breaking down the files into still smaller chunks did not make it much better.
There are quite a few footnotes, some words in italics. That's all. Nothing complicated or fancy.
I am giving up on Scrivener for now! It was probably never meant for serious work, anyway.
ConnectedText did not have a problem with this; neither does Atlantis.
1. In the forum, there is the following claim: "We trialled a 364,440 word (2,361,934 characters) in a single document. First clicking the down arrow in the binder through a series of other docs until one hits the 364,440 word document took about 7-10 seconds to display." This is most definitely not my experience on a AMD Athlonll X4 630 (P) 2.8 GHz (95W) with 4GB of memory (and Windows 7, 64 bits).