Video play back with multiple print tracks

PT 12.2.1 HD
Video via a Black Magic card.

If I try to print 5.1 NDME stems simultaneously to audio tracks, the video play back is reduced to something like one frame per second. If I just print one stem at a time the video runs OK.

Is changing HW Buffer (currently 1024) or Disk Playback (currently 32GB) likely to help, and if not is there anything else that will?

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PT10.2.0 / HDN / HD Omni / MC Control / Intensity Pro / Quad core Intel MacPro
Over 15yrs experience in TV. Currently mainly indie features.

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Video play back with multiple print tracks