After Effects Out of Memory or Memory Leak Fix

In this tutorial, you'll learn about After Effects Out of Memory or Memory Leak Fix. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

The Problem

After Effects shows 'Out of memory' errors, RAM preview only caches a few frames, or memory usage increases until the app becomes unresponsive.

Quick Fix

Step 1: Adjust memory allocation

AE may not have enough RAM.

Wrong — AE using too little RAM:

Preferences → Memory → RAM reserved for other apps: too high

Right — allocate more RAM to AE:

Edit → Preferences → Memory
Set 'RAM reserved for other apps' to 2-4GB
AE gets the rest (leave 2GB for system)
Enable 'System RAM' cache for inactive comps

Expected output: AE uses more RAM for Caching.

Step 2: Reduce preview resolution

Full resolution uses more RAM.

Wrong — previewing at Full resolution:

RAM preview at Full → caches only 10 frames

Right — lower preview resolution:

Preview panel → Resolution dropdown
Set to Half or Third for previews
Full resolution only for final checks

Expected output: RAM preview caches more frames.

Step 3: Increase disk cache size

Disk cache helps when RAM is full.

Wrong — tiny disk cache:

Disk cache: 10GB → fills quickly

Right — set larger cache:

Edit → Preferences → Media & Disk Cache
Set disk cache to 100-200GB
Put cache on an SSD for speed

Expected output: More frames cached to disk, fewer RAM issues.

Step 4: Use Pre-renders for complex comps

Bake complex sections.

Select pre-comp or complex layer
Layer → Pre-compose
Render the pre-comp → use result in main comp

Expected output: Less real-time processing needed.

Prevention

• Allocate maximum RAM to AE (leave 2-4GB for system)
• Preview at Half resolution for complex comps
• Set disk cache to 100GB+ on an SSD
• Pre-render complex nested comps

Common Mistakes with effects memory

1. Using return to exit a function early instead of wrapping a pure value in the monad
2. Mixing let bindings with <- bindings in do notation, producing type errors
3. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors

These mistakes appear frequently in real-world AFTER code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ