Pi zero: slow wifi (pi 2b is ok)

[Xjiks]

Hi,

I recently got a pi zero, and found the wifi bandwith is very slow comparing to the other 2 raspberry I have (version 2b).
I'm using a wifi dongle and a USB OTG cable on the pizero and can barely go up to 60KB/s, while the same wifi dongle on the raspberry 2b runs at 5MB/s.

I tried to put the sd card from the pi 2b into the pi zero, but it's still slow!

I plan to make a CCTV camera with the pizero and camera module and won't be able to stream the recordings with such a bad bandwith.
Is there anything I can do or try to improve wifi bandwith on the pi zero ?

Some specs:
I'm running latest raspian as of today on raspberry website
Power supply is ok (2Amps / 5V)
Tried 2 different sd card
Test transferts with SSH and Samba

[SonOfAMotherlessGoat]

Now for the good questions, what kind of dongle do you have? (Preferably, what's the lsusb output, so we can see what the Pi recognizes the dongle as.)

[Xjiks]

The lsusb result is:
"Bus001 Device002: ID 0bda Realtek Semiconductor Corp. RTL8188CUS 802.1n WLAN Adapter"

I would have to check on the pi2b if there's any difference, but I think it happears under the same name

And also if I may add, when running iwlist wlan0 scan, I can see my router showing these values:
Protocol : IEEE 802.11bgn
Channel 1
Bit Rates : 72Mb/s
Quality 98/100 Signal Level 78/100

the usb dongle is this one:
http://www.modmypi.com/raspberry-pi/acc ... e-nano-usb