As a test, you can install the CC 2019 version of After Effects alongside the current release to compare if something changed in the new version.
It could just be that your expectation for how fast things should be is out of proportion. I don’t know how slow it actually is or what your experience level with AE is. “Super slow” could be minutes per frame or it could be 10 frames per second depending on your expectations.
AE’s renderer isn’t as multithreaded as it could/should be (yet), so it could just be bottlenecked somewhere. Have you tried changing whether there’s a speed difference rendering software only vs. Metal vs. Open CL?
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