Nobody can tell you anything without knowing the details of the template. Provide a link. and I get the impression that you might want to read the AE help. Very few things in AE are in realtime and what you see is quite likely perfectly normal.
I agree with Mylenium. If this is your first time using After Effects, you're probably treating it like an NLE, but it doesn't behave anything like Premiere Pro. It is doing entirely different things under the hood. I'd recommend any new user to start here: Getting started with After Effects It's the fastest free way I know to get up to speed on how to work in AE. After Effects is a very powerful program, so it takes a little bit to get familiar with all the basics.
Get the notion that AE works anything like PP out of your head. It doesn't. It doesn't play back, for one thing. It PREVIEWS, which is a different process. I'd recommend looking over the material you'll find here:
Once you get a grasp on the way AE works, you'll be a lot happier.