From my time playing the game, it does seem to be a pretty notable difference. Even if someone were to perfectly replicate the world record, they would most likely be about 10-15 seconds behind for no good reason, and so separating depending on the OS seems fair in my opinion. It would be nice if there was some compromise method, like maybe we could just add a certain amount of time to each run to make up the gap, but it’s extremely variable depending on how much time you spend on each stage, so that's not really possible. Also, because the game displays as 60fps on either Windows 7 or Windows 10, it’s extremely hard to tell the exact amount of discrepancy or why it’s even happening at all.

残念ですけど差はすごすぎるので公平のために分けるしかないと思う。多分、全部のスピードランに十秒追加させられますっとか思ったんだけど各のスピードランを付ける方法に対する未知数が多すぎる仕方ない。

In my run below, I get a 12:02 as the final time. 18 seconds behind the record. Where did I lose all this time you ask? Well…I don’t know myself. Sure, I lost maybe around 5 seconds on Nue and 1 second in 3-1, but I gained about that same amount of time in other stages (1-2, 1-4, and 1-7 especially) so it should’ve evened out in the end to be AT LEAST within 5 seconds of the world record, but I’m nowhere close. My theory, based off of a forum post from the past, is that this game runs faster on Windows 7.

I tried messing with my graphics settings, enabling triple buffering, adaptive vsync, disabling every graphical enhancement, highest performance over quality, etc, to minimal effect. Even Windows 7 compatibility mode is no help! Achieving a 1:29 RTA time at the end of 1-3 is simply impossible without an old operating system, or, who knows, maybe even older hardware. This is highly unfortunate because I was looking forward to competing against past times, but unless something is done to address this inexplicable gap, there is little incentive to be subject to such an unfair disadvantage.

Sounds like a good idea

このスキップだけでいいのなら世界記録抜いたりして他のカテゴリー作りましょうね