Slow speed while ripping?

[sp4m]

Hi! Right now i'm ripping my very first DVD9 disk with DVD Shrink 3.1 and AnyDVD. Its Encoding right now, and the status is:

Decryption Status: Not Encrypted
Rate: 841 KB/s
Buffered: 53 MB
Time Remaining: 2 hours 6 minutes

But the "Buffered" keeps changing, and sometimes drops to under 1 MB, what does this mean?

My question is, ain't a rate at 841 KB/s very low? I have a P3 700 with 384 SDRAM, I don't now if this has to do with it, but what can i do to make it go faster?

I should maybe add that i'm comprimising it pretty hard... about 70% in main movie, and 50% in some menus... This is because i don't want to get rid of the menus, and there where no audiostreams besides the English.