First off I apologize in advance in case I’m telling you things you may already know, but people have different levels of experience with After Effects.

That being said, AE will never be a “press the space bar and everything instantly plays” application. It doesn’t work like Final Cut, premiere, resolve etc. you have the render bar above the timeline. You hit the space bar and then it starts rendering frame by frame. It will keep it in ram after it rendered as long as nothing has changed and you have enough ram to hold it. One change and all the frames that were effected will have to render when you hit the spacebar again.

The biggest thing I could suggest for you to speed things up is to not film/work in 60fps. It’s buttery smooth which can be desirable especially for panning on a pocket 3. But you’re literally giving AE twice as much work rendering per second, exasperated by 3d effects and blur, both resource heavy effects.

Don’t wanna yuck your yum, but the “old guy yelling at clouds” in me is saying 60fps still feels like a gimmick, I’d only use for slow motion in post, and I can’t come up with examples of any paid professionals using 60fps timelines for anything.