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Even though the new 2021 MacBook Pro uses WiFi 6, its connection is still slower than my old 2015 MacBook Pro (WiFi 5/802.11ac). The 2021 MBP doesn't use the full complement of antennas, so it can't utilize the full bandwidth of WiFi 6. Option-clicking the WiFi icon on the menu bar will confirm that the max transmission rate of the new 2021 is 1200 Mb/s, and the older 2015 is 1300 Mb/s. Going to WiFi 6E will help if you have a corresponding base station (less traffic at 6 GHz), but I'm not sure if overall speed will increase unless Apple adds more antennas.