Make sure buffering is turned on for small I/O requests. The Red SDK manages the I/O to the filesystem and typically the I/O per frame is fairly small.
To rule out a decode performance issue, you can switch off the rocket and set the decode to 1/16th.
This is not possible as both of them use the same app name and share resources. Copying the app bundle to a different folder is not recommended and it will cause issues.
In your GPU configuration I wouldn’t recommend it anyway. It’s recommended when you have equally capable GPUs, so for example dual GTX 680, or a GTX 690 (effective 2 GPUs on the same card).