Group control charts are used for the statistical control of multiple stream processes. Recently, a modified control chart based on the residuals from each stream has been proposed as an alternative charting scheme. This research examines the performance of these charts under varying combinations of shift magnitudes and number of streams affected. Several simulated scenarios were generated and used to evaluate the long-term performance of the two schemes in terms of the average run length. Statistical analysis of the results indicated that the modified chart has an advantage over the traditional group chart in terms of the rate of false alarms. However, both charting schemes appear to have similar shift detection capabilities.