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Besides it and Steam's overlay there's also Game Bar: press Win+G, turn on Performance applet. Press pin icon on it to keep it on the screen.
Essentially, upscaling is rendering at a lower resolution, and then rescaling to your native resolution, with some elaborate tricks.
You tweak it by picking an upscaling algorithm (like: TAAU, TSR, XSS, etc.) and then selecting "how much" upscaling should happen (from "performance" to "native").
It's an important tradeoff between performance and looks, and might let you keep your display at 4K.
That doesn't seem to allow me to have a 4k-sized window at a lower resolution. Whatever resolution you pick in the game settings is what resolution it is. I'm using DLSS but that doesn't allow you to pick a different resolution.
Indeed, upscaling (maybe I should say "upsampling" as is written in the game options) doesn't change the visible resolution, its purpose is to improve performance at higher resolution. The settings for upsampling do not mention a resolution, and maybe that's a bit confusing indeed.
My understanding is that the setting "upsampling preset" really is about the (invisible) resolution at which the game scene is rendered, before being upscaled to your selected window size.
In other words, maybe you could get acceptable performance at 4K with one of the "upsampling methods" (probably DLSS is best on Nvidia, I don't know) and the "upsampling preset" set to a value lower than "native"? But maybe you already tried that, I don't know, just suggesting.
And I also notice that alt-tab in "fullscreen" mode (as opposed to "borderless" or "windowed") doesn't work well, but it seems better if you first switch away from full screen with alt-enter. Seems like a workaround to me, but maybe combining alt-tab with alt-enter helps? You decide.