After all the fuzz on the reloading of my iPad, I found that the process goes by the name: mediaserve did had problem on my iPad, it was running 7~9% CPU all the time, resulting in shorter battery life and sluggish system performance…

I have no idea what the process is for, but since the reload fixed it, ok, well…

If you found your Jailbroken iOS device battery runs out faster than you expect, it is always good to give it a check on top from SSH.