Rooting has nothing to do with wifi speeds, since the apps you're using (like Ookla and web browsers)d don't use root, and the wifi modem (the software that runs the wifi connection) doesn't either. If they did, you couldn't use wifi unless the phone was rooted.
It's possible that whatever program you used to root the phone did something that caused the wifi speed to slow down (rooting is just copying a single file to the phone - how it's done could cause a problem), the question is whether the phone was slow on wifi before you rooted it. I suspect that you're just getting slow download speeds on that phone. Why it's happening is something else. Try the download test on a public wifi that doesn't require a login - that will mean that it's not encrypted, so it would eliminate the TKIP problem as a cause if you get low speeds there too.
04-22-2015 03:18 PM