I'm having a problem playing videos shot with my iPhone 12 on my M1 Studio Ultra that I haven't noticed before. The phone is on IOS 17.0.3 and my Ultra has 64 GB of Ram and is on macOS 13.6. The videos play smoothly on my phone and iPad but stutter on my Mac. It's that way whether I view them in Photos, Preview or DaVinci Resolve. I've transferred them to the Mac via Photos, Email & AirDrop and made sure they they were H.264. I've also tried sizing them to a lower resolution. No luck in solving the problem. Can someone suggest a next step to take? Thanks.