workaround for slow performance and poor resolution with RED R3D files in After Effects CC 2014 (13.0)
The After Effects team are investigating a bug in After Effects CC 2104 (13.0) where RED (.R3D) files are very slow and the image resolution is poor, about 1/8 sampling.
The following workaround has been reported to solve the problems in some cases:
1. Save the project.
2. Choose Edit > Purge > All Memory & Disk Cache.
Please post whether or not this workaround helped you on this thread in the After Effects User to User forums.