No, I found that it still bloats while minimized; you have to "babysit" it and watch how much memory is consumed in the Process list like shown. Maximize/Minimize as poser.exe approaches around 600mb in your case since you only have 768mb RAM.
edit: changing priority will not help you with memory utilzation problems (and generally won't help you in any case I have seen for any purpose).
My Freebies