What is real-world Steam Deck performance with CryoUtilities, OLED, and tweaks?

[ScarlettS]

I'm considering buying a Steam Deck primarily to play my extensive PC library on the go, but I'm concerned about performance for some of the more demanding titles in my collection. I've seen benchmarks, but I'm curious about real-world, long-term user experience. For current Steam Deck owners, how does performance hold up for games like recent AAA open-world titles or competitive shooters after a few months of updates? What are the most effective settings tweaks and tools like CryoUtilities that actually make a noticeable difference in frame time consistency and battery life? I'm also wondering about the thermal performance and fan noise during extended play sessions, and whether the OLED model's improvements are worth the upgrade for someone focused on performance over display quality.