I had a T-Mobile Note 4 as well and I used it for the full 14 days. It lagged. It wasn't as bad as the previous models, but it still lagged. Closingracer, did you ever stop to think your experience might not match everyone? Just stop acting like there is no possibility of us telling the truth because YOUR phone didn't lag, or you just didn't perceive the lag.
I had lag doing the following:
Opening the camera
Opening the multi tasker
Opening the app drawer
Opening the browser, stock or Chrome
Switching apps after the switcher itself finally loaded
This was after switching to the Google Now launcher and disabling all motion controls, s voice from the home key, and any other Samsung bloat I could, including the stupid preloaded security app that active scans every damned thing. Before you say it, it was worse using the default Touchwiz launcher.
I suppose I'm lying, though? Making it all up?
Edit: I also wanted to make sure I mentioned that general scrolling between home screens and in apps got entirely too jittery for the specs of the phone entirely too often as well.