I thought more people would actually put the effort to try and get a fix for this browser. I guess people aren't bothered enough by the lag. I hope I'm wrong and that more than two people actually wrote the devs.
Anyway, I've been communicating back and forth with the devs. I sent them here to check out the lag while typing in XDA after they requested sites for examples. They are looking into it, and hopes to have a fix soon. They have version 6 developing, and I saw a note for the beta testers, so hopefully it will come soon.