Your comments

It will be in the version after the current 3.2.
Sorry, but I don't plan to do that. 

I try to merge duplicate feedback on the userecho forums though.
In the last few weeks I've managed to improve the performance quite a bit. These performance improvements will be available in the next update.
Ah, ok, you have to scroll down to see them. Looks like those are the same files, yes.
I don't know. I don't see any plist files in the settings app on my iPad.
That would be great. You can also send me the crash reports. See http://feedback.textasticapp.com/topic/48133-how-do-i-send-crash-reports/
You can already use Firebug Lite with Textastic: http://getfirebug.com/firebuglite

Just reference it in your html file as described on their website.
Textastic doesn't save and restore the scroll position but it saves the current cursor position or text selection. I'll think about a solution. Your suggestion sounds like a good idea.
I'll try to reproduce the issue.