Comps that are rendered/green in timeline are not playing back in real time
I always thought a ram preview meant the preview would play back from ram in real time. this is often not the case. Most the time, especially comps with audio, don't play back in real time even if they are committed to ram or disk cache (Which means you either get the warped record slow down, or if that's muted in settings, nothing at all)...why is this, on every machine I've worked on...

The latest (November 2019) release of After Effects includes major improvements to our preview architecture. You should see reliable, real-time playback of cached frames. Let us know how it’s working for you.
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Angelo commented
LOL, this is not resolved, I'm having this problem for long now. It's becoming impossible to work. Green bar render previews don't mean a thing anymore. Tell me something, why the **** is it slowing down and not playing real time? I'm running the latest version and even the more barebones comps can't freaking get a preview. Who in the world cares for not real time render previews? How is it useful? The year was 2006, the computers were way worst and I could get real time previews with no problem
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Andy Engelkemier commented
How do you say, "no, this is NOT resolved" I would like to vote for it.
I imported some audio. It's nice clean purchased audio in wav format. I have ONLY audio in the timeline. Only ONE audio. I get a green line across the entire thing. I can play the audio all by itself, but try a preview, nope. Not real-time. it Always stumbles at the same spot. Try cache before playback, no difference.
The audio works fine in premier and fine in fine in audition.yall just screwed up the audio engine in AE or something in recent updates and no one is admitting it. I never had problems till you"resolved" your issue.
It reminds me of when IBM was used to outsource IT work at a large company I used to work at. They said the could do a better job, and it would be better for the company. And Wow, they were closing So many more tickets. It was astounding. Until we realized they were Just closing the tickets. You'd ask a question, they'd give you one answer like, "have you turned it off and on?" and then immediately close the ticket. Of course, once the company caught on, they forced an upset at IBM because once they fixed That terrible system, they were closing Way less tickets than the company was handling themselves.
This seems to be the method Adobe is using as well? Oh, hey, that's resolved. I'm not gonna check in with you. Just tell you it's fixed. BUT it's terrible. It's actually much worse. But no one can figure out why.