I have not encountered any "stuttering" at all. With your post I even did the old hold Shift Key down and click minimize dot. Slow and smooth.
I'm pretty tough on computers and a tough critic.
Quick story - every year since 1994 I buy the latest and "fastest" new Mac. When done though, the family all gets upgrade - the wife got my old one, oldest kid her old one, youngest got older sibling one. Went on for years. Also how I justified buying new every year LOL
And with every new computer I got, faster CPU, more ram etc… you get it home set it up and - you didn't really notice a difference. Not a dig at anyone - just reality.
After all these years - riding in car with my kid, youngest so you know he's not young anymore - he said he saw Retina in name of my new iMac (I run a server he logs into) "any good?" First time I tell him in all these years a computer I actually am blown away with speed I notice. OS speed, internet speed faster, Don't blink I say - whatever I did is done. Freaked me out. Lightroom opens sp fast. Internal file transfers blazing from one computer to the next.
And I bought the "entry" iMac 5k.
Best computer I have ever owned. And that is saying a lot over these years and many 10's of thousands of dollars in Apple computers.
Yes I'm gushing - it's that good. LOL