What is the main reason for performance issues when multiple modes are configured?

The primary reason for performance issues when multiple modes are configured lies in the overall decrease in radio performance. When multiple operating modes, such as different wireless standards (e.g., 802.11b/g/n/ac) or frequencies (2.4 GHz and 5 GHz), are enabled on the same access point, they can lead to increased competition for available bandwidth and processing resources. Each mode shares the overall capacity of the access point, and as more modes are activated, the potential for throughput can diminish. This results in a decrease in the efficiency of data transmission, which may manifest as slower speeds and higher latencies, ultimately impacting the user experience.

Other factors like interference or simultaneous client connections can contribute to performance issues, but the core effect of running multiple modes on a single device is the inherent limitation in radio resources that reduces performance across the board.