I thought it was playable on the LCD Deck. I did turn things down below what the Steam Deck preset was at. It certainly wasn't the smoothest 100% of the time but it was better than Fallout New Vegas on a PS3 IMO. It still holds up pretty well against the Switch 2 version in handheld mode.

https://www.youtube.com/watch?v=SvGQik3m6ag