I had wondered if QoS was causing the issue, but I just disabled it and it made no difference. I'm also wondering if this issue only occurs on gigabit ethernet, as the reduced speed is still above 100Mbit.
Like I said, I've encountered this here, and also with a friend, we both have gigabit LANs and both have the problem of massively reduced speed (85%+ reduction) when Ventrilo is running and connected.
Closing Ventrilo resolves the problem.
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