Increase the texture memory used for OpenGL rendering to 80% of the installed video RAM (VRAM) on your video card. The default of 200 MB is quite small for modern video cards; values in the 400-800 MB range are appropriate for modern cards with 512-1GB of VRAM. Choose After Effects (PC: Edit)>Preferences>Previews, click OpenGL Information, and enter a new value for Texture Memory.
