Techniques are disclosed for processing communications in a communication system switch in which one or more processing scripts are selected for application to one or more communications in accordance with weightings assigned to at least a subset of the processing scripts. Measurements are determined for one or more switch resources, such as central processing unit (CPU) utilization, associated with processing of the communications using the processing scripts, and the processing script weightings are periodically adjusted in accordance with the determined measurements. The system resource measurements may be generally characterized as comprising resource limit measurements, business objective measurements, or other types of measurements. The invention facilitates the processing of communications in the system switch and provides improved efficiency and reliability.