It seems like the Firefly renderer is still running in the background after you've killed Poser. And as such it will continue to use memory and possibly make your computer sluggish.

I say "seems" because I have no idea of how things work on a Mac, but I've had a few occasions where my Poser (both 7 and 8) has crashed during a render, and it turns out that although it is gone from the screen, the Firefly renderer, which is a separate process and therefor CAN continue on its own, is still running and chewing up memory.

And it's quite natural for a computer to become sluggish while Poser is RENDERING - it shouldn't be when Poser is merely running - sitting idle in the beackground or anything else. But of course it will use a lot of ressources to render - that's why so many people do overnight renders. Not because they necessarily takes all night, buut because you can then leave your computer and avoid getting frustrated from the lack of abilities to do other things.

I can browse the 'net just fine on my computer also while Poser is rendering, but it takes TIME. For some reason, especially Google searches takes an insane amount of time while Rosity works close to normal.

If I switch to Photoshop while Poser is rendering, I can do it, but everything is slow and sluggish, and any other program which also uses OpeGL, like my Blacksmith3D, is extremely slow - if it will run at all, I have long periods of "not responding" waiting time there.

So whenever I want anything more than a simple render to finish without me pulling my hair out, I start it and go do something else. Watch TV, go to bed, do laundry... go to work.. whatever will keep my mind off the fact that my computer is not really usable.

But it's not Poser's fault really. It's actually just being very very efficient and using every bit of CPU and RAM it can lay its paws on.

And in Windows you can set a process to "below normal" like BB showed. I don't know if you can do that on a Mac but I would think so, anything else seems illogical.

Oh and btw.. Whenever someone capitalizes Me and My... I'd say they have an attitude problem ;)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.