So I figured it out. It’s definitely a pitfall people here should consider but the fix might be outside LB. I use Pixelcade with ledblinky integration. Lesblinky sends marquee image requests to Pixelcade as the front end game list scrolls.
My Pixelcade is on its own power switch. Power on and everything works well. If I power it down (as common when building instead of playing) then menu navigation in LB/BB stutters. I assume due to a failure/retry upstream as the marquee selected per game cannot be delivered. It’s binary and 100% reproducible.
I’m thinking that the fix needs to come from Pixelcade or the way Ledblinky is integrated with it. But if you use this combo as well, don’t fall into the trap I did.