Speaking to Eurogamer, the game’s executive producer Marty Stratton revealed that the game will run at 30fps on the Switch. Eurogamer asked Stratton to clarify this as prior to this, it was said that the game would run at 60fps, but Stratton has since confirmed that for the Switch, it will run at 30fps, while other consoles like the PS4 and Xbox One will run at 60fps, or at least that’s the goal.
Stratton also highlights how the 2016 port of DOOM onto the Switch ran at 30fps, so if you were fine with those frame rates then DOOM Eternal shouldn’t be a problem either. As for a launch date, it seems that no specifics have been mentioned yet as it appears that the game is still being worked on.
However Stratton does confirm that Bethesda’s plan is to launch the Switch version alongside all the other versions of the game. “That’s the plan right now; we’ll see. We’re still a way away from launching but we have made the decision to make Switch a, what we call internally, ‘first class citizen’.”