I have a Redmi AX6S configured as an access point and switch running OpenWrt 23.05.2. When connecting a 100Mbps wired device (LG TV) to the AP, the Wi-Fi speed drops from around 600-700 Mbps to approximately 60 Mbps. Notably, this only affects the SSID that is bridged onto the same VLAN as the connected Ethernet device. It does not affect the other SSIDs bridged to networks on other VLANs. WiFi is unaffected when only gigabit devices are connected, and other wired devices on the same VLAN also remain unaffected when a 100Mbps device is connected. Where can I start to fix this?
A similar issue has been documented in the Adding OpenWrt support for Xiaomi “Redmi Router AX6S”/”Xiaomi Router AX3200” thread but was never resolved. Where can I start to fix this?