osu!mania scroll speed is indicated in milliseconds but scales with BPM

in stable, bpm scaling is standard behaviour and can be turned off in the options. In lazer however, that option doesn’t exist and scrollspeed is indicated in scrolltime which suggests the speed to be fixed, however it’s not. Currently it seems to be indicated_scrolltime x 50 / BPM = final_scrolltime (based on observation) making the result of a given value unpredictable (just like stable where no player knows what the number actually means and everyone has to try out different values to find one that “feels right”).

Indicating the speed in scrolltime is a good thing as it gives the number an understandable meaning, but if BPM scaling is active then the overlay that shows up when you change the scrollspeed should display both the input value and the resulting time after BPM scaling is applied.

This brings along the problem that lazer currently doesn’t have an option for fixed scrollspeed, which is a must-have. I’d even go so far to question whether or not we want to keep BPM scaling (and if yes, which of the two should be default). It is important to note that even though the default in stable is BPM scaling, almost all players use fixed scrollspeed.

[smoogipoo]

Please test using https://github.com/smoogipoo/osu/tree/fix-mania-scrolling-speed instead. It looks very close to me.

[hhirtz]

Hello,

Scroll speed isn’t fixed for me (downloaded the code as a zip after this issue’s been closed). For example these two beatmaps don’t scroll with the same speed:

• https://osu.ppy.sh/beatmapsets/575053#mania/1217803
• https://osu.ppy.sh/beatmapsets/176972#mania/426032