I've done extensive testing and made faulty investments myself and learned the hard way. But it is what it is, and I can tell you that the top of the line iMac Pro, which I assume you bought, is the slowest of all iMac Pro models in After Effects (and that's the way it will be, forever....unless Adobe start making AE from scratch in a different way). Ram has hardly anything to do with speed. The only reason why a lot of Ram is good, is that it takes longer before the machine starts scratching to disk and it can hold more preview frames in memory which will feel like a faster machine. The speed of the ram doesn't make much difference in AE either. AE prefer a machine the same way as games. Meaning few cores and fast cores. Which is the opposite of what you have bought, and in fact the cheapest option. Plugins in AE are being rewritten one by one for each update Adobe does, but they tend to make the new updates GPU dependent. If you buy a 5ghz intel CPU machine with a fast GPU, that would be the fastest option on the marked today, and it cost about 20% of your iMac Pro. Honestly, Macs are the slowest and most expensive option you can get for Adobe programs. If you really want as much speed for your bucks as possible, you need to read up on pages like pugetsystems.com and see what hardware they recommend for which softwares and then build your own machine or order it from a company (like puget). If you by any means want to stick with a Mac, then get a regular iMac with a faster CPU and as much ram as possible, it would perform a lot better than your iMac Pro in After Effects, that's just how it is, sadly. i.e. Mac Pro, the most expensive one of apples models, performs about 50% of the speed of an intel 5ghz CPU , thats approx 4X the price for HALF the performance!! (caugh, rip off)
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