Using not all hardware speed

[GiedriusQ]

Hello,

First of all I want to say hello to everyone in this forum and sorry if I posted my thread in wrong section.

Ok, now about my "problem".
Currently my server running on:
Intel Q6600 processor (4core/4th/2,4Ghz/8Mb L2)
8GB of RAM
3x120GB SSD (2 in software raid0, mounted on /files/ )
1Gbps network.
Debian Linux
2Core lite license.

Internet speed (IN) are around 200-300Mbps, OUT: 150-200Mbps
I think it's quiet too slow for such fast disk[?].
I'm using moded rapidleech script, so in fact it just read data from external sites and write data to files (located in /files/), then serve files to users. In one word, work with files.

So in my opinion something wrong with litespeed server settings, because speed is too low, IO sometimes gets very high, maybe someone can help me?

All my configuration and real-time stats:http://imageshack.us/g/194/muninq.png/