If you are presenting your wallet, then there's likely card clash going on. People will have to stop doing that, once debit/credit is accepted, as who knows which card it will find first.
On buses/streetcars, I've found it intermittent. Most times it seems fine. But sometimes it seems slow. I'm not sure what the pattern is. Free transfers have been both fast and slow (despite no need for any realtime checks). Though I did notice that the slow tap I got this afternoon on a bus, was likely the first tap in a while, as I tapped in at the back door of a bus, in a fare paid zone; which most people never do. (and doesn't happen on that route at regular stops).
So are the readers on vehicles going to sleep? It could have been hours since anyone had tapped that reader.
