WHY AFTER EFFECTS STILLS SO SLOW IN THE NEW MAC PRO?

I have the new mac pro with this settings:
3 GHz 8-Core Intel Xeon E5
64 GB 1867 MHz DDR3 ECC
AMD FirePro D700 6144 MB
Software OS X 10.9.2
And the AE performs slower than in my old mac pro. I have set the preferences as seen on all those tutorials on this site, I have an SSD external disc for cache files, memory and multiprocessing settings correctly...and previews are very very slow, and I can not even render a single comp without waiting 10 minutes. I am very disappointed and frustrated with this situation...
Am I missing something?

I don't understand why it's even up to the user to figure out what settings are best.  Isn't the application in a vastly superior position to know what its resource constraints are at any given moment?  Instead I have to try rendering a couple of comps, kill the render, fix the render queue since AE STILL doesn't offer a graceful way to quit and resume renders.
I have to say that one of the attributes of AE that consistently disappoints me is multiprocessing and its accompanying memory management policies.  I regularly produce hundreds of network graphics at a go, and I can never reap any benefit from multiprocessing, because AE has to load the entire project into each core, instead of just loading the comps it needs to render at any given time.  Similarly, a project that requires 400 heavily-automated versions (a regular occurrence for some of my Latin America clients, where graphics have to be versioned for multiple feeds and languages) can simply choke AE.  If it could load this stuff into memory on-the-fly (or at least offload some of it when memory gets tight), this wouldn't be a problem, and I sincerely doubt the performance would be worse than it is now.  This is on a previous-gen Mac Pro with 48 GB RAM, so, while not strictly state-of-the-art, it's no slouch.
Heck, even opening some of these projects just to browse their contents is a painful 30-minute process, as AE apparently has to not only load everything into memory before I can even do anything, but, judging by how it hangs for many minutes at  99% on the progress bar, it also seems to be evaluating all the expressions in all the hundreds of comps (presumably so it can render the project thumbnails).  And yes, I've tried splitting the projects up, but this leads to its own complications, particularly when revisions come in a week or two later.
I don't want any of this to sound overly negative, since I know AE has a small team and this sort of stuff isn't trivial to implement.  I do appreciate this application and all it does, particularly for me creatively and professionally.  I just get a bit tired of seeing new releases come every year and this stuff seems to go unaddressed.

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