I see that v2.2 claims to have "Performance improvements for rendering slides in edit view." I'm finding just the opposite on my desktop computer (Windows 7 64-bit).
I upgraded to the latest version tonight (v2.2.0.0016), and I'm finding it super slow to edit a song. I'm in Edit mode, and not On Air. Every time I make an adjustment to song lyrics, the preview panes are refreshing, and my cursor in the edit field lags. I have to stop and wait a second or more for it to catch up. Even typing in the Notes tab causes this response (though the notes don't appear in the slides, so I'm not sure why it would have any impact). I rebooted and tried again, but the issue persisted.
I tried to rule out an issue with this one computer, by doing the same thing from my laptop (Windows 7) which had Proclaim 2.1.0.0028 installed. I powered it on, tested Proclaim, and didn't experience the lag. I then added one new song and got it tweaked to my liking without experiencing any lag. So far, so good. I then installed the latest version on the laptop, and tried again. I edited an existing song, and added a new song, and didn't experience the issue at all.
It seems to be limited to my desktop computer. This issue was occurring a week and a half ago, though. Is anyone else having a similar problem? Any idea what's going on? I'm hesitant to upgrade Proclaim on the presentation computer (not one of the two mentioned here) in case it will experience this issue.