Wifi RTL 8193EU with Antenna 5db

Here are my stats from 1.5m away from main router althought i can get signal from 9 to 10m it start to buffer every 30 second for 1sec, is there any optimisations or tweaks i can do to improve it

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Last login: Tue Sep 8 22:17:30 2015 from
osmc@osmc:~$ sudo iwconfig
wlan0 IEEE 802.11bgn ESSID:“Marisa Gypsy HaHa” Nickname:“WIFI@REALTEK
Mode:Managed Frequency:2.462 GHz Access Point: 20:E5:2A:07:2E:30
Bit Rate:300 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:------- Security mode:open
Power Management:off
Link Quality=76/100 Signal level=100/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

lo no wireless extensions.

eth0 no wireless extensions.