Burning multiple CD/DVDs at one time is slow (3.4.55 x86_64)

[William Thompson]

Please keep me in the CC.

I tried burning 2 DVDs at the same time.  Both processes completed however
there were buffer underruns and the speed was no more than 4x.

Each burner individually can do upto 16x and I have seen the burn end at
16-17x.

The parallel burns ended no higher than 6x.  Why is this so slow?
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