Yes, there was a merge a while ago that fixed some of the issues with network files.
As for the CPU usage not going above 50%, that's because Dolphin is only a dual-core program, and will only use 100% of two cores, which is half of the quad core i7 that you have. As for the GPU, do you have a profile in the Nvidia Control Panel to prefer maximum performance when running Dolphin? GPUs don't always see Dolphin as an intensive program that needs full power, so it throttles down the speed sometimes.
As for the CPU usage not going above 50%, that's because Dolphin is only a dual-core program, and will only use 100% of two cores, which is half of the quad core i7 that you have. As for the GPU, do you have a profile in the Nvidia Control Panel to prefer maximum performance when running Dolphin? GPUs don't always see Dolphin as an intensive program that needs full power, so it throttles down the speed sometimes.