System performance refers to how well a computer or network operates in terms of speed, efficiency, and reliability. It is often measured by metrics such as response time, throughput, and resource utilization. High system performance means that tasks are completed quickly and resources are used effectively, leading to a better user experience. Factors affecting system performance include hardware specifications, software optimization, and network conditions. For example, a powerful CPU and sufficient RAM can enhance performance, while poorly designed software may slow down operations. Regular maintenance and updates can also help maintain optimal performance levels.