A minor issue, but it does lag and at the York Street Teamway this does cause lineups at the afternoon rush.
One of the problems is that it takes too long to stop showing the prior customers information. Most people want to put their card up while walking past the machine, which works, but then the machine continues to display the card info with the lights on for about three seconds. People in line tend to wait for it to turn off before tapping again, as it's unclear if you can tap on at that point. Add on top of this the 20% of people who get to the machine without their card ready, or they have it inside a backpack/purse/suitcase/etc... and just try holding that up to the machine at various angles until it reads, and you get average about five seconds per person, which is not enough when you have just four machines at the main entrance and 200 people arriving per minute. I've never seen someone miss a train because of it, but it gets pretty harry when you randomly get three people in a row in the line all of whom fumble their cards or something.
