About the only think I can think of to speed up Poser's load-the-pose time is to make sure your Windows is as squeaky-clean as possible. That means: all rubbish files cleaned off the system (CrapCleaner - it's free), and the odd defragmentation done so the files are all together. Oh, be careful using CrapCleaner - it tends to clean a bit too vigorously sometimes, like autofill stuff for FireFox like logins and stuff.

There are those who think it doesn't matter, but I have found that if I uninstall programmes I don't use, Windows and Poser seems to work a bit faster.

Just a thought...

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks