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Ok, further data that points to some kind of Syphon serving issue. I figured out how to attach the Unity profiler to our standalone build and went through a build with VSync on and with it off with a client connected and then VSync off without a client where the visual result is good. Most of our time is spent in Device.Present, which seems to mean waiting for the GPU. It runs pretty well, except for the occasional spike, which seems to correspond directly with a “chunking” effect that looks similar to 1-2 dropped frames. And sometimes the spikes are more frequent, resulting in a “grinding” effect.
Outputting to client, VSync ON: http://img846.imageshack.us/img846/3762/screenshot20111011at112o.png
Outputting to client, VSync OFF: http://img684.imageshack.us/img684/2909/screenshot20111011at124.png
Not outputting, VSync OFF: http://img17.imageshack.us/img17/2909/screenshot20111011at124.png
Brian, thanks for the response, yeah same behavior happening in both.