I've noticed the same behavior with the 2.5.0 drivers on EC 10.11.5 the last few days...
I can't tell what's causing it because at that time the CPU usage is so extreme I can't open Activity Monitor anymore. And guess what, I only see this behavior when plugged in a DL-device. So I installed the 2.6 beta this morning to see if there's a difference. But what keeps me wondering is why I've had an "OK"-ish experience with 2.5.0 for months and the last few days CPU usage goes up to 100%?
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