AfterEffects won't playback rendered video at full speed.

Hi,
If I hit play on a video and let it render (let the timeline turn green) when it finishes rendering it will max out at about 20fps, not reaching full 24p. Im wondering if this is a problem in the program or with my computer or possibly a setting I need to change. I doubt it is my system because it seems that my system is powerful enough to play back pro res 422 video without any effects on it at 24p.
System Specs:
MacPro Mid 2012
2x 2.4GHz 6-Core Xeon
12GB ram
NVIDIA GeForce GTX 980 (with latest web drivers, and compatible cuda drivers)
Yosemite and latest AE version.
Any help is appreciated, Thanks!

EvanZazula wrote:
The thing that still baffles me is that even with just plain ProRes video (no effects or adjustments made) I get extremely slow render speeds for playback, ram preview, and output renders.
That's because AE is not video editing software and does not work at all like video editing software.
INCOMING LONG EXPLANATION (borrowed from Rick Gerard):
Sony Vegas, Premiere Pro, Final Cut, Avid are all NLE's (Non Linear Editors) and they are specifically designed to playback a video stream. With any of them, if you stack enough layers or effects on the video they will have to render a new video stream based on pixel based calculations for every pixel in the stack. This rendering, especially for HD sources or for complex plug-ins, will take quite a bit of time.
After Effects, Flame, Fusion, Shake -- are all pixel based image processing applications that act very much like Photoshop. They calculate the values of every pixel in every frame, come up with a new pixel, and then play those pixels back as a video stream. More importantly, AE and all the other pixel based compositing apps, always work internally with completely uncompressed pixel data. NLE's rely on codecs and in some cases, hardware, to playback the video. It's an entirely different way of working with moving images.

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