After added 1000 new sub forums, Sometime get high load on dedicated server

[basketmen]

My forum is region board, so i want add many new sub forums by region (like province-state-city), it created more than 1000 new sub forums (all have option No in "Show this Forum and Child Forums on the Forum Jump Menu" so there is not too much choiches in the Jump menu)


My server get problem after adding those more than 1000 new sub forums, sometime get high load and cant access the board (Load averages can be more than 100-200, normally only 1-2), so i need to restart the apache so can access the board again


I use dedicated server, default memory_limit are 32M, i already try to increase it to 256M but still get high load


so my question : can't vbulletin have unlimited forums/subforums and still running normal (like 1000 sub forums above)? like having unlimited thread and post



please help guys share your knowledge, is there a board with more than 1000 forums/subforums using vbulletin out there...







Nb.1. After i removed again those 1000 new sub forums, my board got back normal again, never get high load again



Nb.2. This is my script version and server spec if needed

Vbulletin 3.6.8
vbseo 3.2.0

* INTEL Core 2 Duo E8400
* 4 GB VGEN DDR2 533 PC-5300, 16 IC
* 2 x 250 GB Hard Disk
* Motherboard : Gigabyte, G31MS2L, Socket LGA 775, Intel G31 Chipset, FSB 1333/1066/800Mhz, Audio, USB 2.0, VGA, LAN, 6x SATA Controller
* WHM/Cpanel