Everything that you do on a sd card is not guaranteed to works fast. Because it could just stop working at any time.
Remember all this builds run on a sd card. That means is going to be 50/50 change that it will not work. Because the sd card could die any time, or stop working.
Let me tell you. Sd card takes a beating with this builds.
I always tell people, you have to be patience, when running android on a sd card.
That's why the new build it going to help a lot of people running android on a sd card because they will have control of data, apps, setting, etc.. To a least much wm on battery life by not overheating the sd card.
This is how i get 2 days out my battery life in android.
1- boot haret
2- let phone sync in. Wait for green light
3- the phone is going to start clean with no app in memory. "following my setting"
4-you will not see data until you activated yourself. "following my setting"
5- once you activate you data, you will see, gmail, yahoo mail. Etc..updating. Once you check your stuff. Deactivate your data, to control your sd card to much wm battery life.
6- yes, you can text, you can make call, receive calls etc..
7- it's just that simple
hope this help
thanks