Portals are very useful, and in many cases they make it easier to get plausible and realistic result with Cycles by reducing render time without loss of quality. I was impressed by great speed up for some of my own scenes. But this is off-topic here. My original point was that the developer is still active and already made many useful contribution to Blender. Saying that developer's work is "useless" just because some other code is not yet good enough for you is unlikely to motivate anyone to work faster. Before that you said that "this now is dead, no hope" just three weeks after the developer said "I'm looking into many different approaches currently and it looks like there is a lot of potential" in another thread. You have to understand that if you want something to be done fast(er), you either have to hire a developer or do it yourself, otherwise you have to wait and hope. Complaining many times in a row and spreading your negativity is not going to help anyone.

For all people who interested in this, here are some quotes:

Thank you!

I also think this should be reopened.