Seconds Per Frame.
Similar to FPS(Frames per Second), it indicate how much seconds it take to render one frame of video or a game.
Mainly used by: Gamers playing high end games on ancient hardware and amateur motion artist rendering videos in desktop PC.
Guy 1: Dude! I downloaded GTA 5 yesterday and it played like a charm at 60 FPS.
Guy 2: Ha! so pathetic, I used to play the same game at 186 SPF.
Guy 1: Woah! that's awesome!... wait... what!
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