takes about 6 seconds from when i press siri in my camaro, to when the phone answers the request. EVEN when connected via USB, the phone takes longer to change songs, when it should be instant.
Yes, I can confirm similar behavior. In my BMW's a long-press on the steering wheel would bring up the Siri ding-ding in about 2 seconds, now it takes about 4. iPhone 6, same phone on both iOS's.