Thats just simply not accurate. Would you be willing to make a video and upload it proving or showing what you are describing? Like a side by side or something?
Im curious what it is that you're seeing and why you say its so drastically bad on yours.
It isn't drastically bad in that you notice the lag and stutter instantly. It is something I mainly come across whilst web browsing, which is what I use my 6+ for 90% of the time.
I think you're assuming that my phone lags all the time and that it's noticeable to all & sundry 100% of the time. It isn't. Sometimes it's subtle and certainly not a dealbreaker, but at other times it's a real PITA. It's there and I notice it several times per day.