I have noticed a slight reduction in framerates when loading back in from a suspended state but only on certain games. Namely High On Life
I was in the middle of Witcher 3 when I got my deck, and pausing during a cut scene (and some are feature film length, it fells like) caused the video to go slide-show and the audio to get choppy, and there was no recovering the game. I basically had to go back to the previous save and play back to that point. PITA. Something similar happened in one other game (can’t remember at the moment) and I just gave up suspend unless it was something simple / mindless like Yoku’s Island Express.