After Effects “Out of Memory” During Export — Real Fixes for Heavy Comps

After Effects out of memory errors during export usually point to one expensive frame, not a long timeline. This guide covers the causes Adobe documents, the settings that change memory use, and the point where a bigger machine is the honest answer.

What Does an After Effects Out of Memory Error Mean?

After Effects out of memory errors mean the app could not find a block of RAM big enough for a frame it was building. Adobe says the need depends on the most memory-intensive single layer, and that each frame needs a contiguous block, so fragmented memory can fail even when total free RAM looks fine.

Adobe lists what raises a layer’s requirement: higher color bit depth, larger comp resolution, larger source images, color management, masks, layer styles, certain blend modes and effects, precomposing without collapsing transformations, and 3D shadows or depth of field. Its advice for the error itself is to decrease the memory the frame needs or install more RAM. The table below uses Adobe’s own per-frame formula to show how fast the base cost grows.

My calculation from Adobe’s formula: height x width x bits per channel / 2,097,152, in MB for one uncompressed frame. This is the floor for a single buffer. Every effect, nested comp and mask can need its own buffers on top.

Which Settings Fix After Effects Out of Memory Errors First?

To fix an After Effects out of memory error, start with the cheapest changes: purge memory and disk cache, drop the project to 16 bits per channel, quit other Adobe apps and lower the RAM reserved for other applications. Each one either reduces what a frame needs or frees what After Effects can use, and none costs money.

1. Purge before you judge. Use Edit > Purge > All Memory & Disk Cache. Adobe notes that purging is faster on large projects but does not synchronize the project database; hold Alt on Windows or Option on macOS while choosing All Memory to force that. iRender’s guide to failed After Effects renders gives the same purge as an early step, after checking the error log, when a corrupt cache is suspected.
2. Lower the bit depth. Going from 32 to 16 bits per channel halves every frame buffer, as the table above shows. Do it first on the comps that fail, and keep 32-bit only where the grade or lighting needs it.
3. Close other Adobe apps. After Effects shares one RAM pool with Premiere and other Creative Cloud apps. Adobe says quitting Premiere frees its RAM immediately.
4. Lower the RAM reserved for other applications. It sits in the Memory preferences. Adobe says you cannot set it below a minimum baseline, so this gives back a limited amount. Leave enough for the operating system and any app you keep open beside After Effects.

Does Multi-Frame Rendering Cause After Effects Out of Memory Errors?

It can contribute, though the public evidence is thin. Puget measured an average of about 6% more system RAM with Multi-Frame Rendering in 2021, and 1.5 to 3 times more VRAM depending on the composition. The practical test is simple: switch it off, export again, and see whether the error follows it.

Multi-Frame Rendering is on by default and, per Adobe’s documentation, uses all CPU cores in parallel, with gains that depend on cores, RAM and graphics card. You find the switch under Memory & Performance in Preferences. Effects that do not support it show a yellow warning icon in the Effect Controls panel.

One Adobe Community thread shows why to test rather than assume. A user on After Effects 23.3 with 64 GB of RAM and an RTX 4090 saw the app climb to about 99% of system RAM while preparing a 6K comp, then crash.

The poster read the crash log as pointing to NVIDIA drivers. An Adobe Community Manager said the RAM use and the driver were unrelated, that it looked more like a driver bug, and that the Lockdown plugin appeared to be calling into the driver. Turning Multi-Frame Rendering off stopped the poster’s crashes, and staff did not confirm a root cause. Read it as one early report worth testing against, not as proof that Multi-Frame Rendering causes the error.

Adobe also offers a “% CPU reserved for other applications” slider, from 0% to 70% with a default of 10%. Adobe describes it as a CPU control, so treat any change to it as an experiment for memory problems.

How Do You Shrink a Heavy Comp Without Hurting the Final Look?

To avoid After Effects out of memory errors, cut the number of expensive operations per frame, not the quality of the output. Pre-render nested comps, apply shared effects once on an adjustment layer, and add memory-heavy effects such as glows and blurs last. Adobe lists all three as ways to lighten a complex project.

• Pre-render nested comps so After Effects does not rebuild them every time they appear.
• Use one adjustment layer for an effect shared by many layers. Adobe says it is then processed once on the composite below it.
• Limit particle counts and leave glows and blurs until the animation is locked.
• Split the project into smaller ones and combine them before the final render, as Adobe suggests for complex work.
• Export an image sequence first. iRender’s failed-render guide suggests rendering the comp as an image sequence through Adobe Media Encoder, importing the frames back, layering them into the composition and rendering again. In my reading, the benefit is that finished sections do not need re-rendering if a later one fails.

How Much RAM Does a Heavy After Effects Comp Need?

There is no single number, because the largest layer sets the need. Adobe’s floor is 16 GB, its guidance is at least 2 GB per processor core, and its Multi-Frame Rendering table puts high-end systems at 48 to 128 GB. Puget’s 2021 tiers start at 32 GB.

Puget’s article is from 2021 and warns that it may be out of date, so use its numbers as a floor, not a target.

It also gives a formula for the RAM Preview cache: seconds x frames per second x height x width x bits per channel / 2,147,483,648 gives gigabytes, plus 5 to 20 GB for the app and other software. By my arithmetic, 10 seconds of UHD at 30 fps and 16 bits per channel comes to about 18.5 GB for the cache, or roughly 24 to 39 GB with that overhead. That is a preview estimate, not an export one, but it shows how quickly a 4K comp can approach or pass 32 GB.

For related failures, our guides on RAM maxing out mid-render and on GPU out of memory errors cover the same symptom from the 3D side.

When Does It Make Sense to Render a Heavy Comp on a Bigger Machine?

When an After Effects out of memory error persists after you have lowered bit depth, purged caches and split the comp, RAM is the real limit and more of it is the honest fix. If the crash follows a plugin or a driver, a bigger machine only moves the same crash somewhere else.

As of October 13, 2026, every package on iRender’s price page lists 256 GB of RAM, a Threadripper PRO CPU and a 2 TB NVMe SSD. A single RTX 4090 server is $8.20 per hour and a single RTX 5090 server is $10.80, with 10% off when you rent for three hours or more ($7.38 and $9.72). Because the RAM is the same across packages, the extra GPUs in the larger ones add cost, not memory, so for a RAM-bound error the one-GPU package is the place to start. You get a remote Windows desktop, so you install After Effects and your plugins on it yourself.

The order I would check things in is short. First, does the error appear on one comp or on every project? Second, does it survive a drop to 16 bits per channel? Third, does it survive with Multi-Frame Rendering off? Fourth, does the biggest layer need more RAM than you own? Only a yes to the fourth question justifies renting. If you run Cinema 4D beside After Effects, our guide to a single cloud server for both covers that setup.

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