[urgent] very slow speed on asterisk

Hi Guys

We have a 4GB, Dual CPU (quad core) Dell 1950 server with dual 15k RPM Raid-1 on Sangoma E1.

We’ve installed CentOS 5.1 with asterisk and Asterisk2billing.

the problem is the A2billing IVR takes at least 4 seconds and I’m not sure what could be wrong. the CPU usage doesn’t even reach 1 percent so I’m guessing we have some wrong software or module or need to change something in bios perhaps?

Thanks
Good luck