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by gilgoomesh 4064 days ago
Most drawing in OS X is done by the CPU. The GPU is used for compositing (layering the views drawn by the CPU over each other) and additional special cases (CoreImage effects, OpenGL, etc).

I have no information on what is going weird in 10.10.4 for OWaz but it's far more likely to be a Thunderbolt driver issue than anything else (i.e. simply related to pushing data over the cable).