There have been a few tune-ups in Rhino 6 since SR 4 that you are running. Please try updating to either SR 8 or the SR 9 release candidate.
Also, your System Info tells us that your OS seems to think that there isn’t a GPU in your machine. Please find out which GPU you have and install a current driver for the hardware.
You can use a utility that @jeff wrote to assist you to find out about the GPU. To download and read the instructions, see this post: