BDP Referral Tracker Performance Woes

A few days ago I upgraded my BDP Referral Tracker plugin for WordPress. That was a huge mistake. After I did, I began getting serious performance problems on my hosted box. Where before even with the recent spike of traffic that was many times baseline, the load on the box would stay below 1 almost all the time. After I upgraded the plugin, the average load climbed to between 3 and 5, and I observed it as high as 60 at one point. I disabled the plugin just out of self-defense. I think I’ll either downgrade back to the version I had or lose it altogether. The new plugin is much nicer but the SQL joins it does to do its work are hosing my box. I’ll go back to the rudimentary version with a single table that never made my server runaway, thanks.