I also have the above problem when either A) I turn the wifi tethering on and it turns on but then turns back off (Need help with that problem to) Or B) I turn my WiFi tethering off and then try to turn it back on.
I also would like to note that i use GO Power Master with the PRO Version key. I use screen off optimization, and have most of the system settings checked off so they wont turn them off, but its still slow.
So my question is, what all processes go into the WiFi tethering and how can i fix the problem. Im also unrooted.