Lag, but GPU usage close to 0%
I've tried to understand what was the problem on my machine.
I've monitored the CPU, GPU, disks, ram ... and looked at the times where I get less than 1 fps.
The only constant: when this happens, the GPU usage is close to 0% (GTX770/4GB). This is clearly not a lack of power from the graphical card.
The CPU is vastly underused. (i7 2600K)
It does not seem to be related to network usage either (even though some threads seem to be waiting for the network, I doubt anyone of them is the rendering thread.). And anyway with 30/2 Mbps / 20ms this should not be an issue.
It's almost always in sync with the start of reading some game files from the disk (and my RAID5 is well up to the task).
The memory usage, although close to 4.5GB, is still well below my 8GB. (4.5GB ? What do they do with this ? It's not like if the game was vastly open or more pretty than some recent games)
On another hand, I've also noticed swapping, and that may be a killer. Anybody here has issues with a fairly recent nVidia and 16GB of ram available ? (I've seen reports with 16GB but on AMD/Mantle)
