And there aren't any other editors installed? pico
? emacs
? nano
? <code>joe</code>? <code>ed</code>?
Well, if not, I assure you you'll benefit from learning how to use Vim. Once you get the hang of text objects, you'll wonder why you ever liked Sublime without Vintage-mode.
WordStar used CTRL-K to put it in command mode. So you'd type:
^KS to save
^KD to save and close the document
^KF find (I think ^L for find next)
I learned it as a kid and I still use it as an editor on my Linux boxes. The Linux version is called joe (Joe's Own Editor) It's pretty cool if you need a WordStar fix :-/
EDIT: Oh, try ^KH to toggle the help menu (I think.) It'll show the commands on the top of the screen IIRC.
You can find the detailed commands here, but the ^KH command might be enough:
http://joe-editor.sourceforge.net/manpage.html
The command line options don't apply to WordStar, but the Editing Tasks section does.
I opened it with font-lock on, but SQL mode is very simple (it just highlights keywords). Also, the amount of free physical memory is probably also a factor.
Btw, I was aware of Joe Allen's text editor performance comparison, so when I had to open this file, I decided to bypass Emacs and open it with JOE. JOE took 25-30 s to load it, but then it worked without a hitch. It turns out JOE for Windows had a bug (since fixed) where you couldn't insert a new line in the replacement text of a search/replace operation. So I decided to bit the bullet and open the file in Emacs. I prepared myself to having to wait a long time and deal with an unresponsive interface... and nothing of that happened! Just a couple of seconds to load, and then, smooth as ever (saving took a relatively long time, though).
I guess the moral of the story is don't dismiss Emacs without first checking. Maybe it can do it after all.