performance rate

**Performance rate** is the **ratio of actual output speed to ideal output speed during time when equipment is available and running** - it quantifies throughput losses caused by reduced run speed, micro-stops, and process inefficiency. **What Is Performance rate?** - **Definition**: Actual processed units divided by theoretical maximum units for the same run time. - **Loss Mechanisms**: Slower cycle times, handling delays, suboptimal recipes, and repeated short interruptions. - **OEE Role**: Performance is one of the three core OEE components with availability and quality. - **Measurement Need**: Requires trusted ideal cycle definitions and accurate production counts. **Why Performance rate Matters** - **Hidden Capacity Recovery**: Low performance means output can improve without new equipment. - **Cost Efficiency**: Better run speed lowers fixed cost per wafer. - **Process Insight**: Performance losses often reveal mechanical drift or control-system tuning issues. - **Delivery Reliability**: Stable performance improves forecast confidence and cycle-time predictability. - **Continuous Improvement**: Performance trend is a leading indicator of operational discipline. **How It Is Used in Practice** - **Baseline Setting**: Define realistic ideal cycle and throughput standards by product family. - **Loss Breakdown**: Separate slow-cycle loss from micro-stop loss for targeted corrective actions. - **Improvement Verification**: Recalculate rate after maintenance or recipe changes to confirm gains. Performance rate is **a critical throughput-efficiency metric in fab operations** - improving actual run speed against ideal capability directly increases effective production capacity.