RetroArch on Nvidia Shield 2019 Pro NES ROMS EU region stutter

Hi guys,

just like the topic name says I noticed when I play EUR region RetroArch NES / GENESIS ROMS on Nvidia Shield 2019 Pro I get this noticeable constant stutter.

If I play USA region - everything is great.

Any idea why its like that?

I’m from Europe playing on a lcd tv.