Lately I've had awful framerate issues in the viewer, and some models with multiple texture maps don't display correctly at all, sometimes only displaying with a flat black texture. It doesn't seem to matter if it's a low-poly model with less than 1000 triangles and a 100% diffuse texture or a super high-poly model with multiple high-res texture maps, the framerate is always the same. I also see that if I rotate the model quickly, my CPU usage goes up dramatically, but my GPU usage stays at 0%. I tried restarting my computer, updating my drivers, updating chrome, etc, etc... Nothing has any effect.