I don't know of any specific technology to replace Fastpath, in its entirety. I, also, have seen a lot of instability. I think that a lot of it has to do with the Webchat piece - in my case I am running it within Resin (a JSP container) and I find that it is a week point of the system (it does not re-establish dropped connections). I have decided to rewrite that component (the JSPs), along with the Agent client piece in (the Fastpath Spark Client). In my case, the clients are web-based and I am using StropheJS (an XMPP/BOSH client) to communicate directly with the Fastpath server plugin over BOSH. I have also turned off clustering (Fastpath doesn't really cluster anyhow) and that has seemed to help some. The Fastpath plugin largely follows the XMPP extension XEP-0142, which is available on the XMPP.org website.
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