Look at the website for Puget Systems. They do a LOT of testing of various components with actual usage with professional software including AE. They’ve got a lot of good writing on what makes your AE faster and what doesn’t.
More RAM likely won’t make AE faster. It’ll make you able to hold longer previews in green though.
Talking about making things faster in AE is very complicated. Sometimes the bottleneck isn’t the CPU or RAM at all and it’s file transfer speed. Or maybe it’s caught up with decoding a heavily compressed codec before it can even do your effects.
As far as actual image processing goes, the core speed of your CPU matters most. Some things like Camera Shake Deblur, some of the grain effects, Wave Warp, etc. are multithreaded for rendering, but not everything is at the moment. A lot of effects are GPU-accelerated now, so if you use more of them (and you have a decent AMD or NVIDIA GPU), you’ll notice things being much faster than if you make the computer move frames back and forth between the CPU and GPU while rendering.
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