This step by step guide shows how to improve the WIFI connection speed in 2,4GHz radio module.
Check if the management VLANs have more than 20 clients per subnet.
A large subnet increases broadcast and multicast traffic, which also raises the amount of packet collisions and reduces the airtime fairness rate to slow down the network.
Adjust the multicast rate from 5.5 Mbps to 12 Mbps on the NXC controller.
Go to Configuration > Object > AP profile > Radio. Edit the radio profile of 2.4 GHz in Show Advanced Settings: Multicast Settings.
Step 3: Configure the channel width to 20 MHz on 2.4 GHz because there are more non-over lapping channels available when using 20 MHz.
Step 4: Configure the DCS of channel selection on the 2.4 GHz radio profile.
Step 5: Disable 802.11w if it is enabled.
Step 6: Check the station list if there are other stations connecting in low RSSI, whcih will downgrade the total wireless throughput.