seems there is 2 misleading tags now that I saw this save (which is vooperia and vooperian)
it seems like the speed 95 one is fastest
As Umm and Riptier1 said, they change at the same time. Tested speed "25" vs "100" at one point and they were both on Y:217.
and it turns into a video
if you replace the brick with pscn and spark it at the top it instantly turns on
i think i can make one faster in not sure but come to my page to find it