I changed the door that I use the most (the door between the garage and family room) to a fast loop response. This zone does have the chime enabled, and I also use that zone to trigger the garage lights. The only thing different that I have noticied is that sometimes when closing the door, if I didn't use my man strength and close it all the way, and perhaps the door ever so lightly opens again just as I realize I didn't get it closed, the chime will sound again. When I had it set to the normal response time, I had never seen this, unless the door completely reopened and I wasn't there to shut it just as fast as it had opened. I don't view this as annoying, or problematic, or anything. I am just documenting what I have seen as the only difference. I do like the lights coming on in the garage a few milliseconds earlier. You'd be surprised that you really do notice such things. And that's all I have to say about that.