High CPU mysqld

Running callcenterstats2.2.5

Is there anything that I can do to reduce the CPU load when running queries with Call Center Stats2? At times the load is 200% in top. Am I able to remove old cdr information from the database, say 6 months back, and if so would this help? I understand that the time frame specified will create more entries to query, but even searching three days worth of stats causes a high cpu load.
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