Performance testing and tuning are critical to developing an Endeca implementation that behaves well and provides your end-users with a satisfactory experience.
Endeca strongly recommends that you incorporate performance testing and tuning into your overall development schedule and has provided the Endeca Performance Tuning Guide to assist you with these tasks. You can find this guide in the knowledge base on the Endeca Developer Network (EDeN) site at: http://eden.endeca.com.