Which audio latency do you use when playing the MMV ?
I suppose that you want to play the MMV live, but for some patches the amout of calculation needed is very dependant of the varying parameters, so if you have a very short latency, cpu peaks due to short transient on certain parameters (like the filter frequency) may produce some short cpu overload, resulting in clicks and pops.
Try to set a longuer latency value when playing (a 5 to 10 ms value is very playable), this may smooth the cpu peaks.