vbseo.php high load server

I have vbseo on my forum Forum MamicaMea.ro

• For several weeks I have problems with high server load increases and vbseo.php file is taking these huge resources.
• ​Normally the server load is between 1 and 2,but is now regularly at 20 and goes until 70, normal memory was 20%
  and whent here are problems up to 100% server CPU load and memory 100%
• I use APC
  By 1 month ago I hada traffic of about 3500 unique visitors per day,and up to 200 simultaneous connections, now I fell to 2400 unique visitors per day,up to a bout 120 simultaneous connections
  I have dedicated server Procesor AMD X6 3,2 Ghz 16 GB DDR3, Hard disk 2 X 1 TB

Sorry for my english

Hello,

What is your environment? apache? linux? running cgi or dso?

Have you seen:
vBSEO Optimization Tips - vBulletin SEO Forums