So yesterday I’ve tried my new OLED Deck on my 4K TV for the first time (haven’t done it with the LCD Deck before either) and was surprised how my games suddenly only ran at 15 FPS. Not even fluctuating, just a rock solid 15 FPS.

After trying around a bit I figured out that the problem was the system-wide FSR. I had it turned on for some of my games to get them a bit sharper by using a resolution just slightly below 800p so I could enable FSR, which ran fine when using the Deck on its own.

However when connected to my TV, FPS drop from locked 30 to locked 15 when FSR is active. Same situation with using NIS by the way. Setting it to Linear or Nearest instantly brings the FPS back to 30 but the image logically gets more blurry(Linearr) or pixelated(Nearest) as a result.

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Any idea as to why that happens? It’s the case with normal Steam games (tried My Time At Sandrock for testing) and also with the Yuzu Emulator.