Various installations featuring late-model Lummus ginning and lint cleaning machinery were sampled in order to evaluate machinery performance in a variety of areas. Performance measures such as residual seed lint on ginned seed, along with fiber properties of the cleaned lint after various stages of lint cleaning are presented. The purpose of these tests is to provide tangible data as to how Lummus machinery performs in various regions of the Cotton Belt. New cotton cultivars offer a continual opportunity for process improvement, which necessitates ongoing testing. Understanding the effects of processing rates upon both throughput and fiber quality will guide new machinery developments to maximize the value of the ginned cotton to both the upstream and downstream customers.