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@marshian Borderlands2 had PSP port - it was working with 15fps there.
On PC with turn-off shadows and all postprocessing BL2 was working on 720p on 8600 Nvidia with 30fps.

PSP is 480×272 screen resolution.
720p is 7-times bigger than that and 30 fps vs 15 -> 7x2=14 times bigger performance required to render BL2 on 720p than on 480×272 screen.

Same linear scale goes to modern games - it is mostly about "screen size" - 1440p is alot of pixels.