IIRC, you can alleviate the problem by setting the sweeping arc of the visual sensor to zero, in sensors.sim or sensors.dat file. I can't precisely remember the file name right now, as I'm at work and I modded the file more than a year ago.
Anyway, in principle, the visual sensor works somehow like a car windshield wiper. If you reduce the sweep zone to a few degrees, or make it fixed instead of sweeping, the sensor kinda "locks onto target" and there is no need to reaquire it every 5 seconds.
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