Gareee:

One possibility: external drives are MUCH slower then internal drives.. maybe if you install the main app on your main system HD instead of the exxternal one?
Ah!  I didn't know that!  P6 works just fine on the external, but I guess adding P7 as well has probably clogged it up quite a bit.  I'll try installing to the C: drive and see if there's any difference.

I does look like you are running a system that's at least 4-5 years old, and P7 really has been optimised to take advantage of newer hardware.
Whaa???  I bought this comp last Christmas from Best Buy.  I looked it up and the Introduction Date is November 16th, 2005:

Compaq Presario SR1625NX

Integrated video is always REALLY BAD compared to adding a video card, and you can biuy one 2-3 years old that would be more then twice as fast as what you are currently using for very little cash.
I didn't know that either!  I have an ATI RADEON 9200 sitting in my old comp.  Would that be better?

arcady:

This doesn't surprise me, though the logical answer would be disappointing. As long as there is one undo available, every delete means Poser first has to record everything about the present state. You will therefore -probably- not see notable gain until you try having no undos available.
I'll try setting Udo to zero and see what happens.  Would have been nice to have
an Undo that actually works after almost 4 years of using Poser, but... shrug  Heh.  :P

"You don't know what we can see
Why don't you tell your dreams to me
Fantasy will set you free." - Steppenwolf