If it has not been noted by now, the longer you are in Ballrace, the laggier it will get.
The lag makes the physics between the moving platforms and your Ball increasingly… bouncy.
This problem can be fixed by leaving and reentering Ballrace; there is no need to close the entire client.
This fun-lag-bug-stuff is most likely how some people made a few pretty fancy trick shots. Not naming any names of course. @scratch
Also, when you die 3 times on a level, (specifically on Midori) the level is reset; however, the cuboids that were previously moving/rotating with a platform are now stationary. Correction: new, stationary cuboids are spawned whenever a level is reset, assuming the cuboid was picked up at least once.
This can also be fixed by leaving and reentering Ballrace.
I also put this in Bug reports. I usually get to the final stage before it happens with me though :P. I do know exactly what you mean though IT gets SUPER LAGGY. Especially the FPS
Turns out, whenever the level is reset by you dying 3 times, or whenever you advance a level, any cuboids that you had previously picked up are respawned, stationary. Every time. Even on the levels that you have already completed.
Eventually, by advancing levels and/or dying lots, the sheer amount of cuboids respawned will make Ballrace lag. You can test this by going into Ballrace, on either world, grabbing a cuboid or two, then resetting the level a few times (via dying) and there will be multiple cuboids in the one spot you initially picked them up from.
Of course, sorry if anyone already knew and stuff and stuff.