I have Kali on USB Flash Drive and i can connect to Wifi but its really slow: 1 - 13mb/s but when i normally boot in to Windows the speed is 240mb/s+.

Kali version: 2017.2 64bit
PC: Thinkpad T410 with Intel Core i5-560M, Intel HD Graphics, 4GB DDR3 RAM
WiFi card: Intel Centrino Advanced-N 6200 AGN

Friend had an idea to use 32bit version instead but i dont think it will help.

I new to Linux in general but i am reading the Kali Linux Revealed book because i figured out it would be a good way to start

Any suggestions on whats the problem?