Default Not sure how to explain it but urgent`

So the miui rom @Lozochum made is perfect, but theres a screen when i shut down my phone where it has a picture of a cat and it says MIUI Redefining android for example this screen also shows up but says Optimizing apps X out of X, Is there anyway i can change this and if so what file isit?
Current Device: Sony Xperia J ST26i
Current ROM: MIUI Rom - By Oregon69
Root Status: Rooted