This is Windows trying to be helpful. There's two things we've discovered that can cause this. One of them is Background Activity Moderator (BAM). It's supposed to regulate background network traffic so it's not interfering with normal use. Except it thinks the library should be handled as background traffic.

There's no easy fix. It requires editing the registry. You need to remove the registry keys that BAM has created for Poser so it will leave your library functions alone. There's no way to totally disable BAM so it can't "help" again.

https://forensafe.com/blogs/bam.html

The second possible culprit is Fault Tolerant Heap (FTH). This causes a general slowdown of Poser in general. And again it's Windows "helping". And, again you'll need to edit the registry to remove Poser from the FTH list. It it possible to edit the registry to just turn FTH off so it will stop "helping".

https://learn.microsoft.com/en-us/windows/win32/win7appqual/fault-tolerant-heap

If you're not comfortable editing the registry don't try this. There's a way to sneak around it.Both of these apps use the full path to identify it's victims. If you move Poser it will leave it alone, at least for a while. Uninstall Poser and then install it to a different folder When prompted for the Install folder just pick a different name. (C:|Program Files\Fix My Poser\) that will free it from the clutches of BAM. Well until it decides to help again.