Fastest method for screen capturing on Linux

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This is possible using VirtualGL in a server with hardware acceleration. Basically just configure the server appropiately, then either on the same machine or on a machine in the same network, run 

export DISPLAY=<your xvfb display>
vglrun <your_app>

This will have the following advantages:

1) your app will render using virtualGL, which will use the hardware

2) VirtualGL will display your 3D context inside the Xfvb display, which will only render the 2D widgets in CPU

3) configure Xvfb to render to a framebuffer

4) profit!

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