What to improve to 9-table UB without lagging?

[Nonononono]

I'd like to be able to play 9 tables at Ultimate Bet, but anything above 5 or 6 my CPU utilization approaches 100% and I start to lag with the risk of timing out.

I want to get a better idea of which component is most in need of improvement to eliminate the problem. I'm running XP Home, with:

(1) Processor/CPU - Pentium 4, 2.8
(2) RAM - 512 mb
(3) Internet - DSL, ~300 kb

Disk space is not a problem. If I understand the Windows Task Manager stats (and I don't), RAM seems to be fine because ultimatebet.exe only uses around 30 mb. So is it clear that I need a better CPU?

For background, I routinely played 8 tables on Party & skins with no trouble, only occasional minor lagging. I can do at least 12 tables on Stars with no trouble, and less than 20% CPU utilization.

Bodog gives me trouble playing more than 2, but that's probably not unusual. I had major problems trying to play Eurolinx when it was on Tain -- best I could do was 2 tables at a time.

Thanks.