Have you ever tried to add this line into the Host file ?

127.0.0.1 www.renderosity.com

This might be the trick to speed back up Poser and if then you know what or who is using up all the resources :)

it was already a known Issue that there was a Loss of Speed in Poser 11.2 after integration of Rendo Store into Poser of about 20% or more so we might just search the error on the wrong Place ! Not to mention the Random Call home and each time you start Poser the New Licence that gets generated. All this stuff is accessing Ports and naturally causing your security to make additional checks . ( Just a Theory )