about the performance of squid

Hi, I use squid as a web accelerating cache proxy for the backend MS-IIS-6.
When the requests per-second reache 2000, the squid will eat CPU
resources to 99%. The files are some small size image, css, etc. I fill
the regex computing or other operation may result in the dropping of
the squid's performance. Is there some other way to improve squid's efficiency ?
My computer hardware: 3.0 G Interl CPU, 4G memory, 100G SCSI disk.

Thanks

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zsxxsz
2007/1/28