Problem Details: I can play the game perfectly fine, then all of a sudden, Osu takes up 100% (and keeps it there) of the CPU, thus causing my PC to lag, then in most cases, freeze, forcing me to hard shutdown.I merged your post to the Cutting Edge thread. Anyways, this is known, and it's only happening in Cutting Edge. I think it's going to be fixed soon. Until that, if it's really bothering you, change to Beta or Stable.
Video or screenshot showing the problem: I cannot show a screenshot as the lagspike lags the PC too badly before I can screenshot it.
osu! version: 20151009.7cuttingedge