

In OpenWRT, I believe it’s in the settings for the “primary” ssid on each radio, which is usually the first one in the list (per radio) on the wireless settings page.
Openwrt also has options to block multicast or convert to unicast. Also make sure you are disabling lower speeds on the radio. That will reduce your max range, but devices that communicate slowly are another killer.
Broadcast and multicast both have to go at the ssid basic rate…the slowest speed supported by the AP. That could be 1Mbps. And then the AP has to repeat it. And depending on the type of traffic, this may also initiate more broadcasts from other devices on the network.
So if you can reduce broadcast/multicast, or increase the minimum speed, you’ll have significantly more time. Since wireless is a shared medium, “time” is really the most critical resource.
Not to mention still absolute crap support from commercial software.
Looking at you,
VMwareBroadcomOmnissa.