Apparently, there was a nvidia-304-304.134 release in the past week. I still had to uncomment the "#PATCH[1]="buildfix_kernel_4.3.patch" line in dkms.conf and run 'dpkg-reconfigure nvidia-304' to get rid of the mtrr-add and mtrr-del references so it would load, but the speed problem that others have noted appears to have been dealt with. At least watching Netflix on this particular machine is back to where it was on 16.04.
Apparently, there was a nvidia-304-304.134 release in the past week. I still had to uncomment the "#PATCH[ 1]="buildfix_ kernel_ 4.3.patch" line in dkms.conf and run 'dpkg-reconfigure nvidia-304' to get rid of the mtrr-add and mtrr-del references so it would load, but the speed problem that others have noted appears to have been dealt with. At least watching Netflix on this particular machine is back to where it was on 16.04.