The title kind of speaks for itself. There is currently no official ruling on whether or not one is allowed to change their FPS in the middle of a run. This discussion shall be an attempt to create an official ruling about this. Please provide examples of levels where doing this would be beneficial as I can only think of Great Divide where the 1st TL has better odds with one FPS and the 2nd is better with another.
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I've never felt the need to change my FPS in the middle of a run in order to gain any sort of advantage. FPS tricks are few and far between, it just seems unnecessary to me. However I don't know of many examples of levels where it would be advantageous to do so.
Since Lee was talking about Bent Reality, I think the benefit there is glitching into the slanted platform faster with a lower framerate.
I also imagine there are some levels that rely on mine/nuke hits where changing FPS would at least be nice; Dizzying Heights comes to mind first.
Playing the entire level at low fps allows for the low fps trick and doesn't require fiddling with it mid run. I like to make a big fuss about playing at lower fps but in all honesty its not that big a deal, I get used to it pretty quick.
Off the top of my head,
Stop 2's Can't Jump
is probably the most extreme example of this. It's a catch level with a nuke hit, requiring a mid-run fps change to get an optimised time. While few and far between, I feel like these levels are the reason for why this trick should be allowed.
"cheater hakcer i want your flair gikemve me it" - MASON35, 2020
Something just feels off about it to me. Not sure what it is, but it feels like this is the type of thing where people could find an extreme way to abuse it like with the screenshot glitch. Two MBG levels where this comes to mind are Marble Materials Lab (lowering the frame rate just for the jump to the second gem), and Great Divide for the second traplaunch. But I'm sure there could be other instances just in MBG, like Space Slide and Skyscraper. I guess I'm fine with it for now, it just kind of feels inherently sketchy.