It has been brought up a few times by myself and a few other users. So when the phone is on, I press the lock button. The screen goes dim for a second or two and then it goes to sleep and makes the lock sound. Sometimes it’ll hang for several seconds and in the meantime, I can’t do anything but wait for it to go to sleep. It’s annoying.
So essentially all you're saying is "delay in lock screen" gotcha.