[CentOS] Any way to reduce CPU use of OpenSSH?

On my CentOS v5.2 server (dual Pentium4) the OpenSSH daemon stands out as being the most CPU-intensive of the applications running, It's used 176 minutes of CPU time in the last 2 days alone.

Is there any way to lower the CPU utilization without compromising security? (I.e. without using a less processor-intensive encrypt/decrypt algorithm?)

I'm getting the CPU use figures from top, so there no fine-grained info on exactly what code is taking so much time. I'm assuming that the bulk of the time is spent in the OpenSSL libraries.

Is there some hardware add-on or processor-specific optimization that would reduce the CPU load incurred by OpenSSH?

Thanks.