That is definitely the results of the RAM being maxed out and everything being warped. You said on the MPC forum that you like having the whole project warped, to keep the elastic nature of options open. I think the Force is trying to keep track of all warp settings, in every clip, not just the ones playing. The warp engine in the Force is unusable, unfortunately. I think if you have all the clips rendered in the proper tempo, your problem may disappear.
That is definitely the results of the RAM being maxed out and everything being warped. You said on the MPC forum that you like having the whole project warped, to keep the elastic nature of options open. I think the Force is trying to keep track of all warp settings, in every clip, not just the ones playing. The warp engine in the Force is unusable, unfortunately. I think if you have all the clips rendered in the proper tempo, your problem may disappear.