AMD HD6850 mining speed is very slow
Your intensity is very low (I:8) - dynamic intensity does not work well with scrypt. You will need to increase it manually. You can set a value to use when starting the program by adding --intensity 13 to your command line options/batch file. Replace the number 13 with the desired intensity. For a HD6850, I suggest you try values from 10 to 15. 

If increasing the value by one notch does not significantly raise kh/s, gives you hardware errors (the number after HW:) or starts impacting in a noticeable way on desktop performance, then reduce it again.

You can also change the intensity whilst cgminer is running. Press g, then i, then carefully type the number, then enter.