Preview: why slow with nothing edited?

I'm running a trial of After Effects, to see what the product can mean for my business. I run an Intel Quad core with 8GB of RAM.
I have an empty 1280x720 29.7fps composition and no matter which 1280x720 video I import with different codecs, the preview (with the "play button" and not the "ram preview" button) always seem to be around 14-19fps (message: "NOT realtime") and that is without doing anything with the video (video placed in composite). Why do I have such low frame rates already when all it has to do is play the original video? I can't imagine what the frame rates will be if I actually start editing these files.
What am I missing here? I assume it's still filling the cache for the ram preview, but why does it take so long with nothing edited? Is there a way to avoid this, maybe by converting the video to a new format that AE manages to cache faster? I don't have this problem with a similar product (demo) like HitFilm, even with some edits. Now don't get me wrong, I prefer to use AE but I still don't get this ram preview thing. In HitFilm I can add 3D effects and all kind of other stuff and the preview (video of same size) plays smoothly and with sound (in some cases a lower resolution is required).
I can understand that at some point you're going to reach the limit what you can preview realtime with the hardware available so that ram preview is necessary, but not when I haven't even done anything to the video.
Confused...sigh

There are hundreds of video and illustration apps I have never heard of; many more video devices, too, like cameras. I don't have the time to follow every development in this industry. I know After Effecs, though.
Here's your statement: > "I don't have this problem with a similar product (demo) like HitFilm, even with some edits. Now don't get me wrong, I prefer to use AE but I still don't get this ram preview thing. In HitFilm I can add 3D effects and all kind of other stuff and the preview (video of same size) plays smoothly and with sound (in some cases a lower resolution is required).>
You seem to be implying here that this app is superior to AE for some functions. Since I have no experience with it, I bow to your superior knowledge and I encourage you to use the tools you need to accompolish your compositing tasks.
But you also seem to have a chip on your shoulder and I'm sorry you have chosen to deliberately misunderstand my statement which, I believe, acknowleges your predicament and congratulates you honestly for discovering the limitations of After Effects before you spend big money on the application.
> I'm running a trial of After Effects, to see what the product can mean for my business. <
I've reported your post to the forum admins as unacceptably antisocial and equally ungrateful.
Message was edited by: bogiesan

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