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By default, many drivers lock the adapter to a 20 MHz channel width to prevent interference, limiting speeds to 72 Mbps. Go to Device Manager > Network Adapters > Realtek RTL8188CU > Properties > Advanced . Find Channel Width or Bandwidth and change it from "20MHz Only" to Auto or "20MHz/40MHz". : By default, many drivers lock the adapter
Look for Realtek RTL8188CU Wireless LAN 802.11n USB 2.0 Network Adapter . Right-click the device and select . : By default
1T1R (SISO - Single Input, Single Output) : By default, many drivers lock the adapter
