Slow renders in After Effects are one of the most common frustrations in motion design. Here are eight things that actually make a difference — settings, habits, and tools that reduce render times on any machine.
1. Use Media Encoder for Final Renders
Never render directly from After Effects for final output. Queue to Adobe Media Encoder instead. Media Encoder renders in the background, freeing After Effects for continued work. It also handles format encoding more efficiently than the built-in render queue for most delivery formats.
File → Export → Add to Media Encoder Queue.
2. Enable Multi-Frame Rendering
In After Effects 2022 and later, Multi-Frame Rendering uses multiple CPU cores simultaneously. Go to Preferences → Memory & Performance and check that Multi-Frame Rendering is enabled. On an 8-core machine this can cut render times by 50-70% on CPU-intensive compositions.
Note: some older third-party effects are not compatible with Multi-Frame Rendering. If you get errors, disable it temporarily.
3. Adjust RAM Allocation
After Effects reserves RAM for other applications by default. In Preferences → Memory & Performance, increase the RAM allocated to After Effects. Leave 4-8GB for the OS and other apps; give the rest to AE.
More RAM means more frames cached in memory, which speeds up both preview and render.
4. Use Proxy Files for Heavy Footage
If you are working with 4K or 6K source footage, create proxy files at a lower resolution for editing and animation. After Effects substitutes the proxy during preview and switches back to the original for final render.
Right-click any footage item in the Project panel → Create Proxy → Movie.
5. Pre-render Complex Pre-comps
If you have a pre-composition with heavy effects that does not change — a background, a looping element, a complex texture — pre-render it to a lossless codec and replace the pre-comp with the rendered file. After Effects skips re-rendering that element every frame.
File → Export → Add to Render Queue. Render with lossless output, then import and replace.
6. Reduce Composition Resolution During Work
Working at full resolution for every preview is unnecessary. Use the resolution dropdown in the composition viewer — Half or Quarter resolution speeds up previews dramatically without affecting final render quality.
The final render always uses full resolution regardless of the preview setting.
7. Purge RAM Cache Regularly
After Effects keeps rendered frames in RAM cache. On long sessions, this cache can slow things down as AE manages what to keep and what to discard. Periodically clear it: Edit → Purge → All Memory & Disk Cache.
This is especially useful when switching between very different compositions.
8. Optimise Effects Order
After Effects processes effects in order from top to bottom on each layer. Placing expensive effects (like displacement maps or motion blur) after simple effects (like colour correction) means the expensive effect processes a smaller or already-optimised image. Review your effect stacks and move cheaper operations to the top.
Also: effects applied to a pre-comp affect the entire pre-comp as a flattened image. Effects applied to individual layers inside the pre-comp are more computationally expensive. Use pre-comp level effects where possible.
The Bottleneck Is Usually Not What You Think
Most After Effects slowdowns come from RAM limitations and inefficient project structure rather than raw CPU speed. Organising pre-comps well, using proxies for heavy footage, and enabling Multi-Frame Rendering will typically have more impact than upgrading hardware.
For repetitive technical work that does not need to render at all — like building glass morphism rigs or organising layer stacks — After Effects scripts eliminate the work entirely rather than just doing it faster.