[IGSTK-Users] Tracking lag problem on one computer, not the other.

[Steve Fallows]

I have modified the NeedleBiopsy example to use the Ascension 3DG trakSTAR
tracker. On my desktop computer everything seems to work fine - tracking is
very responsive.

However, I need to be able to run this on a MacBook Pro running Win 7. It
runs, but tracking has about a two second lag, from the time you move the
tracker tool, until the screen updates to show the new position.

I've checked the following things:

1. Both machines are Core i7 processors with 8GB of memory running Win7
x64, so I don't think it's a lack of compute horsepower.
2. Simply moving the sliders to reslice the image is equally responsive on
both machines, so I don't think it's a matter of graphic/drawing throughput
updating the images.
3. Both are running a Release build.
4. The Ascension provided tools show the same response time to tool
movement, so I don't think it's the USB link or another hardware issue
between the MacBook and the Ascension unit.
5. I have disabled the Desktop Window Manager Session Manager, which is
know to slow some screen operations.

Is anyone familiar with any IGSTK behavior like this? I'm thinking maybe
something in the PulseGenerator functionality is defaulting to a different
value on the two machines.

Thanks,
Steve
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