WLan speed is slower than former Comtrend AP

RouterOS Wireless Networking
1

Hi, I’ve got a mikrotik 951g-2hnd where I have 3 SSIDs, all of them with RSNA_PSK (WPA2).

Doing some speed tests from my mobile phone (Lumia 925) I just got 18-19 MB/s.

When I connected my old Comtrend Home 5813 router (FTTH - WPA_PSK) and did same tests I got 40 MB/s with same device and same ISP.

Using WLAN Info application, I can see that Mikrotik’s connection speed is shown as 18mb/s while Comtrend’s is shown as 48 mb/s

What can I do to improve Mikrotik’s speed?

Thanks

2

By the way, testing with an iPad connected to my Mikrotik gives me 48 Mbps, so it seems some kind of incompatibility with my nokia device. Can anyone help, please?