The version one of this project was very useful. The new version has a major setback. The new version includes a global link to other rooms hosted by Blastchat with no way to turn this link off. While this may be a great feature for some sites, those needing a private chatroom don't have a way to disable this feature. Major bummer.
You can disable global features completely and you can disable access for guests as well.
One can not compare IRC based chat with AJAX based (read more about how AJAX works to understand why there is "delay"), lag can be caused by user having slow internet connection as well.