After effects slow preview

New Here ,
Sep 17, 2022 Sep 17, 2022

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Hello,

 

I hope someone knows the answer to my problem, because I think I might have messed up some settings in After Effects and it's an easy fix.

I recently bought a MacBook Pro, M1 pro 10 core CPU, 14 Gpu, 32 GB of RAM (switched from a PC) and installed the 22.4 version of AE.

The problem is, my preview is extremely slow, because AE is trying to pre-render my whole scene in the background.

When it finishes pre-rendering (I mean the green line above the timeline), everything is great, but until it finishes, the preview is nearly unusable.

Even when the line above it is green (so it should be real-time), but there is a part of timeline that wasn't pre-rendered, AE prioritises that over the current preview.

I hope I didn't make it too confusing.

 

Please help 😐

 

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Performance , Preview

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Community Expert ,
Sep 18, 2022 Sep 18, 2022

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I think unfortunately you have misunderstood how AE assembles a preview, what you're experiencing is normal.  AE builds each frame, with all the effects into the RAM - when that frame is done, it goes green.  This process is a lot slower than an editing program which as far as I know, playback the original files from one edit point to the next.  Sometimes when previewing from the RAM, AE will not be able to keep up (other background processes sharing RAM etc...) so it sort of stumbles.

 

If you open the Preview Panel, you can see lots of options for the types of preview you want and these are customisable.  So you can decide to playback without audio, playback from the current time indicator etc...

I also make a lot of use of the Solo controls to only preview the layers I am currently checking.  AE isn't an editor so if you need to set timing, you should do that in PP first, then add your effects in AE.

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New Here ,
Sep 18, 2022 Sep 18, 2022

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Thank you for your reply.

I'm not a native speaker, so I guess I didn't make it clear enough, sorry for that.

I'm not a new AE user, I've been working with it for years now.

The problem is the priority of actions that After Effects does.

It should preview first and pre-render the further part when it has some spare power, so it can preview longer in real time.

In my case it was doing things the other way around - it prioritized the pre-render over preview and if there was any non-green part in the timeline, the preview would be slow, even if it was green and should be in real time.

While I was writing this reply, I thought of disabling multi-frame rendering and it feels like it solved the problem.

I have to test it more to be sure, but for now it seems to be ok.

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New Here ,
Sep 23, 2022 Sep 23, 2022

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Unfortunately the issue wasn't resolved.

Until the whole composition turns green, the preview is extremely slow.

It gets real time as soon as the whole comp turns green.

Anyone has any idea how to solve this problem?

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