when I wanted to transfer a larger file from my NAS to my FP3 I was surprised by the low speed.
I then found out that it was only connected to my 2,4Ghz Wifi, not the faster 5Ghz one (my FRITZ!Box 7560 router is providing both frequencies, with the same SSID).
Normally the phone should auto-select the better one.
Anyway, after forcing the FP3 to 5Ghz only, I was even more surprised (in a very negative way) that the phone could barely keep the connection stable. Speed was abysmal and the connection was lost every few seconds.
To make a long story short, after playing around with different 5 Ghz Wifi channels (disabling auto-channel selection in the router), it turns out that my FP3 has severe speed problems with anything higher than channel 112 (>5,560 Mhz), channel 116 (5,580 Mhz) being the worst with an instable connection.
I am now using channel 52 and the phone can reach 200 MBit or even higher.
I know that Wifi speed is tricky and depends on whether or not you have many other neighbouring Wifis but I wouldn’t say I am in overcrowded 5Ghz Wifi environment (only counting ~3 foreign 5Ghz Wifis with somewhat stronger signal).
My router actually auto-selected channel 116-128 because it was/is the least used range.
Can anyone confirm this?
PS: My girlfriend owns a FP2 and she has had a bad Wifi experience for a long time. This also seems to have improved after I have switched to channel 52!