Cue Lag

I have a set of cues I'm running on my Ion where I'm running about 55-60 cues in about a 20 second time frame hitting the GO button (to music).  Recently, every now and then, one or two of these cues (not the same ones every time) lag a bit.  Every cue is @ time 0, and all that the cues are doing is turning different movers on or off.  For some background info, my first cue list I use is a Master cue list that I save all our songs to (for worship), then 'copy to' Cue list 2 for a given weeks' worship set.  Cue List 1 I would guestimate has approx. 900 cues at this point.  The individual Sunday set list (Cue List 2) would have approx. 60 - 200 cues (depending on if we do this one particular song that has 135 cues- which is the one I'm speaking of).  I'm guessing that the number of cues I have on the console at this point shouldn't make a difference since I'm probably not even putting a dent in what the console can handle. So should I save the show and do a deep clear, or save the master cue list to an external drive to keep it off of the console?  I'm on v1.9.  Ion w/2x10 fader wing.

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