After Effects is a very resource-demanding software. Here are a few ways you can improve the render speed.
1. Close other programs
After Effects is CPU-intensive software and you can close all other programs that are unused or work in the background to free up resources.
2. Change the resolution quality
You can change the resolution quality in the preview panel. It is common to work on a quarter resolution or even 18 of the quality for very heavy projects. 
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