Hey there, thanks for posting! Emma does have an autosave feature that's meant to run in the background, and ideally it wouldn't be noticeable, but it sounds like it's getting in the way. Can you describe a little bit more about what's happening? For example, which mailing in your account was running slowly? What were you doing in the account when things were very slow? Was it consistently slow, or did it get slow after certain changes in the campaign? I'd like to see if I can recreate the slowness, and possibly find a way to remedy this.
We don't have a feature to change the autosave rate, but we are looking into ways to speed up the editor, so any information you have will be helpful! Let me know, and I'll be happy to take a look!