There's a file, named ImageIO_Mac.mrw in Runtime: ImageIOPlugins that can be either renamed or deleted, which seems to speed up Poser when it isn't there. I don't remember all of the details, but I've renamed it ImageIO_Mactemp.mrw and noticed at least an decrease in startup time. And I always use Fast Tracking instead of Full Tracking, and Smooth Shaded over Texture Shaded as the latter options are slower.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.