the question is: why is FFrender running at normal priority then?

Poser will be launched at any priority, determined by user
Queuemanager will be launched by user at any priority, or by Poser
FFrender will be launched by either QM or Poser
and... any process ingerits the priority from its parent/launcher, at launchtime.

So when QM is not used and Poser starts at reduced prio, how can FFrender run normal?

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though