A lead assembly for an implantable medical device includes a lead body having a proximal end and a distal end. The printing elements are divided into plural blocks, each having a predetermined number of nozzles. A display pipeline of user-supplied image modification processing modules are reduced by first representing the processing modules as multiple, individual matrix operations. Nodes in a cluster may provide data storage, processing, andor inputoutput functions, as well as one or more alternate communications paths between system components.