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

Without wanting to sound condescending, because I genuinely understand your complaints, I must point out here that some of the onus here belongs to the hardware purchaser.  How carefully did you assess the purchase of the Mac Pro?

In my own facility, we were torn about which hardware to purchase this year.  After lots of research of available benchmarks, and assessment of what hardware After Effects relies on, we decided not to buy Mac Pros just yet, and bought a bunch of fully specced out iMacs for now.

The thinking for this:

• All the benchmarks we found showed AE performance didn't get a significant enough bump to justify Mac Pro expense.  If you're a FCPX editor, Mac Pros are a no brainer -  FCPX is optimised for this hardware.  But AE is not.

• A significant part of a Mac Pro's cost is in GPUs, which are irrelevant to our main AE use.

• The cost of one reasonably specced Mac Pro workstation was about equal to two fully specced iMac 27" i7 workstations, with 1TB SSDs and 32GB of RAM.

• Any new generation tech is fraught with danger.  We decided the 2nd Generation Mac Pro will be a much safer bet, especially since they are manufacturing in an entirely new facility, and the machine itself is a major new design.