Run multiple pickdist/xmlback?

[emmulator]

We are running OpenEMM 5.5.1. We're sending 100s of thousands of emails a day. But it appears that sometimes when a user generates particularly large content, say a megabyte of html with lots of replacement variables, the xmlback process can take a long time to unpack a block of emails, and this can cause a delay in getting other mailings processed. Since the work is already broken into these blocks, would it be possible to run multiple pickdist/xmlback processes? Is that just a matter of calling merger.sh or pickdist.sh multiple times in the startup sequence, or is there some configuration that would be needed?

Thanks!