I have 2 Internet Service Provider WAN1 (100MB) and WAN2(50MB) directly connected in TPLINK ER605 Omada Gigabit VPN Router and in port 5 use as a LAN and connect Unifi AC-LR AP.

But when i speed test on standalone system on LAN (Port-4) i got 150+ MB internet speed but on WiFi it shows just 40 - 50MB.

So kindly guide me is there is a configuration issue in Unifi AP OR anything i missed in TPLINK b/c in LAN the speed is upto the mark but on Wifi it is not. 

I appreciate your response.