[iBook] Virtual PC 6 on 1.2 Ghz iBook question

[gooddog at interlync.com]

Folks;

I have a 1.2 Ghz iBook Power PC G4, with 1.25 GB DDR SDRAM with 24 GB  
free hard drive space. However, my VPC6 seems to  be a bit pokey. It  
started out fairly crisp for the first few months, then started to  
slow down. I use only one Windows program, StoryView, a writing  
program, which I like a lot. There's nothing else like it on the  
market. If the guy who wrote it would write it for the Mac, the  
problem would most likely be a moot point (the guy who wrote it says  
he's a Mac guy).

I've tried to increase the memory allotment ,but it looks like I can  
only increase the memory to 512MB. The Apple Genius guy seemed to  
think it could go up to at least 1 GB or higher, but didn't know how  
to do it.

Can anyone help? Is this possible? If so, how? Can anyone point me in  
the right direction? I've read that the VPC 6.1 uprade doesn't work  
with Tiger very well.  Has anyone heard if VPC 7 is any better?   Can  
anyone please comment?

I am now considering a new, high-end MacBook when they come out so I  
won't have to deal with this issue if it doesn't work on this iBook.  
But, first I'd like to see if I can correct  the problem I have now.

Thanks for your time. Best,

Mark