Valve announced on that twitter that the Steam Deck performs at its best in ambient temperatures between 0° and 35° C. If the temperature gets higher than this, Steam Deck may start to throttle performance to protect itself.
A bit more detail about this – Steam Deck’s APU runs well at temperatures up to 100°C. At 100°C, it will start to throttle performance, and at 105°C it will shut down. Again, this is to protect itself (and you) from damage.
— Steam Deck (@OnDeck) July 19, 2022
