Reply To: Syphon – Heavy CPU Usage

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Also, are you initiating you GL context on one GPU, and displaying on a second GPU? (i.e., running a second application that is on a second GPU, listening to the server?).

You can additionally use GL profiler and enable break on SW Fallback, to see if any GL calls happening are not being run in full vertex and fragment acceleration (each can be individually done on the GPU while the other is accelerated).