According to this talk, the latency should be no worse than pulling at any frequency rate http://www.google.com/events/io/2010/sessions/building-real-time-apps-app-engine-feed-api.html
In practice, we use channel API in project Yaac ( http://code.google.com/p/yaac/) to push back query results piece by piece and it works quite good, the latency is just neglectable -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/q_yE5v7SAjgJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
