Disabling legacy 802.11b data rates (such as 1, 2, 5.5, and 11 Mbps) improves efficiency by reducing airtime used for low data rate transmissions. These rates significantly increase channel occupancy time and reduce network throughput. It also helps eliminate backward compatibility modes like protection mechanisms.
From CWDP-305:
“One of the most effective ways to improve efficiency in 2.4 GHz networks is to disable the use of legacy 802.11b rates. This prevents low-rate clients from consuming excessive airtime and reduces the need for protection frames.”
— Reference: CWDP-305 Official Study Guide, ProtocolandSpectrum Analysis Chapter
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