Big Resource Use Jump!

If you don’t mind, disable PowerPress then run the tests again. Sometimes other plugins cause PowerPress to double its efforts. If the queries and impact usage cut in 1/2 after disabling PowerPress then that is an indication that something on your server (plugin or theme) is making PowerPress do more processing than it should. If it decreases by a small amount, then P3 is not truly reporting the plugin correctly. If it is a modest improvement, then there most likely can be room in PowerPress to improve. Your results with PowerPress would be helpful. You can email them to me at cio ]at[ rawvoice dot com.

I have once before chased a phantom issue with P3 and PowerPress, last time I did P3 test was also testing the wp-admin area as well as the public site. In such a test PowerPress would be memory intensive since it does a lot of stuff in the wp-admin.