Deperately slow after upgrade to SMF 1.1RC1

[scorp]

I operate SMF 1.1RC1 on a dedicated server with 1 gig of RAM. My CPU is running at +350%.  My forum is www.scorpsguideusa.com and I have status.php installed if anyone wants to review the stats.

Ihave 33,000 topics and 21000 members. Usually, 100-200 members are logged on at a time.

Any suggestions what I can do to decrease the CPU load?

http://www.scorpsguideusa.com/yabbse5/status.php

MySQL version 4.0.20-standard
PHP      version 4.3.8
PERL version 5.8.0

[dtm.exe]

Bug in Firefox 1.5 Causing Server Issues with SMF 1.1

[scorp]

I changed the script.js file and added the j after the ? in the index.template.php file as discussed in that thread. I was hoping that was the cure but it had no effect.

Anybody else have any ideas?

My hardware is as follows:

QTY     Hardware Component
1    Dell \ 1600SC Dual Xeon MB \ DAT54AMB8C2
2    Intel \ 2.8 GHz 533FSB \ P4 Xeon
1    Hynix \ DDR 266 ECC \ 2GB
1    Unknown \ Onboard \ SCSI
1    Fujitsu \ 73GB:SCSI:Ultra320 TotalControl \ map3735nc
1    Dell \ DRAC \ III
   
   Installed Software
- Urchin Urchin 5
- Redhat Enterprise Linux - OS ES 3.0
- Demarc Sentaurus Client 2.1
- DarkORB CPanel 6
   Bandwidth Utilization / Network Connectivity    
   1. Allowed Bandwidth Usage: 2000GB (Bandwidth type: /export/home/ntss/bin/RTGCustomerAudit.php-)    
   Hardware Object's Upstream Connection: bl11a.01.dllstx4 (10.0.5.42) Port: FastEthernet0/13    
   Hardware Object's Upstream Connection: bl11-drac2950-1 (10.130.254.62) Port: FastEthernet0/13

I appreciate any help anyone can offer. This is beyond my skill and talent level to figure out.