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I was surprised when I tried the included demo (tuscan village or something). The latency was really bad. I thought they had a big focus on bringing down the latency though.

Could I have had a defective unit? Or does it matter what PC it's running on, etc? Is it normally really good?

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The PC could certainly be a cause. Some video card drivers, for example, deal poorly with multiple displays or secondary displays, and add an extra frame or two of buffering.

Having a device like this certainly improves testing the PC side.

I found substantial difference between machines (and OS's). It was quite slow in a Lenovo x220 running Linux, and much better on a mac mini (running MacOS).

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