After Effects not playing in real time preview

Forum|Forum|11 months ago
May 20, 2025
5 replies
675 views

hello,i have after effects 2024,and when i preview my video or photo,the preview gets very slow,and a red warning appears in my preview pannel saying that my preview is not in real time.i think this has a connection with the green line,because when i preview,a lot of empty spaces appear on it.this issue happens with all of my projects.already tried to change the resolution,allocate more RAM to ae,cleaning cache,and nothing works.i ask for solutions please.

Correct answer Warren Heaton

Something else to try: If the duration of your Compositions are on the longer side, and that would be anywhere from 30 seconds to a minute to five minutes or more, set the Work Area to a shorter duration for when you Preview. Try a five second or a 10 second range, let After Effects cache that time span (you'll see green above it), and then play the preview. If set to loop, the first play through may show as not being real time, but by the second or third loop it should play in real time. You can click and drag from the middle of the Work Area to slide it down the Time Ruler to preview other area at the same duration.

If you cannot get real-time previews at all, condition rendering previews to a video format that you are confident that your computer can play smoothly in VLC Player, Windows Media Player, Apple QuickTime Player. But also reply with details about your computer specifications, and the settings that you're working at inside of after effects because, as I'm sure you're aware, it's best to be able to play your previews in real time directly inside of After Effects.

jefubbudu

Inspiring

This will almost always be the case. I rip on AE a lot but nuke and resolve, even blender do it. Though every software handles it differently. Every effect on every layer is processed in order, pixel by pixel. You can speed it up by using lower definition, and pre-cache it i believe, but AE is notorious for running out of RAM before it can cache the whole file and leaving you with an ever-rendering preview as only a few frames fit. AE would be faster if it had true multithreading instead of copying the render kernel to each core and handing out frames nearly at random. True multithreading would mean you could be using 4 cores per frame, and achieve much more stable framerates. Many modern software do that, and use GPU to do it even better. AE is definitely not modern.

S

sabine_4280Author

Participant

I will try the solutions presented. Thank you very much

Warren Heaton

Correct answer

Community Expert

Something else to try: If the duration of your Compositions are on the longer side, and that would be anywhere from 30 seconds to a minute to five minutes or more, set the Work Area to a shorter duration for when you Preview. Try a five second or a 10 second range, let After Effects cache that time span (you'll see green above it), and then play the preview. If set to loop, the first play through may show as not being real time, but by the second or third loop it should play in real time. You can click and drag from the middle of the Work Area to slide it down the Time Ruler to preview other area at the same duration.

If you cannot get real-time previews at all, condition rendering previews to a video format that you are confident that your computer can play smoothly in VLC Player, Windows Media Player, Apple QuickTime Player. But also reply with details about your computer specifications, and the settings that you're working at inside of after effects because, as I'm sure you're aware, it's best to be able to play your previews in real time directly inside of After Effects.

O

onehunerdpercent

Participating Frequently

Thank you! I’ve been dealing with choppy preview playback for months, maybe years, and never realized the length of my composition could be causing the issue. Brought the in/out to 1 minute and everything started to play perfect. No wonder the issue seemed so random.

ToolfarmJP

Community Expert

I am not sure about your environment. I would recommend that you set the cache disk on M.2 Gen 4 SSD separately if you can add one.

nishu_kush

Legend

Thanks for writing in, sabine_4280.

After Effects preview works differently than an NLE like Premiere Pro. After Effects needs to store cache (indicated by the green line) before showing the preview in real time. So, the part of the timeline that is green should be previewed in real time.

Hope it helps. Let me know if there are any other questions.

Thanks,
Nishu

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