Been playing this game for a while on my Mac Pro (12 Core Xeon With RX580 and 32GB Ram, so definitely not a power problem) and I've experienced significant interface lag.
I've turned off facegen and that helped a little, but as you can see in this GIF I created it's still fairly significant. Enough to make playing through a season almost a bit of a chore. Managing the team is pretty exhausting.
Is this amount of interface lag normal?
Here's my video of it in action:
https://imgur.com/a/uUWfSAF
In addition to the interface lag, I get some weird behavior with drop-downs. It's hard to explain, but it seems like sometimes when I click the drop down it disappears after a second or two, and together with a delay of a second or two after I click it leads to me clicking whats undernead the drop down because it's disappeared rather than clicking what I want to click if that makes sense.
Another video of that happening:
https://imgur.com/a/0xVOMnP
I'm on Version 5.7 Build 66