Re: new to this site
Engine speed always makes a difference, because the goal should be to match the engine rpm with the drivetrain rpm. Ideally shifts should be smooth and un-noticeable.
But since we are all closet race car drivers and not chauffeurs, if you are shifting at 5-6,000 rpm expect it to be rougher. As noted, the sweet spot seems to be 2500-3000+ rpm depending upon the gear. Since my MT6 cruises around 2800 rpm at 80, then that's the spot to shift from 5th to 6th when I hit 80. In reality, I'm already in 6th at 45-50 and just gently accelerate from there. In the lower gears I generally upshift around 2000 rpm and it's usually pretty smooth.