Playback stalls randomly when adding a track

Here is what happens. I have an instrumental track. I go to add a vocal track. The singer hears the instrumental track in his headphones. The playback stalls, randomly, for a tiny bit of time. He tries to stay in sync with the music, but in the best case this adds big chunks of latency that have to be removed manually. Worst case, the stalling throws him off and we have to re-record. What might cause these stalls?

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