Those are the ones that live in that area and would be causing the high CPU usage.

I started suspecting the kernel extension, the KEXTs. How do you debug/troubleshoot kernel_task? Not easily. It was happening when I was launching a VM (most of the time). And then all of a sudden, my CPU would ramp up in a period of 15-20 seconds, from 5-10% to 100%. I know it's summertime, I know I'm in a hot area of the world, but I wasn't expecting the fans to be pegged at max the whole time. Here's a small personal story from not so while ago (a month or so).ДЄround 5.12-5.1.14, my MBP11,5 started going nuts. Limestone_lenny wrote:Thanks for putting the fan operation in perspective.I haven't even started! That's why they're there.Д®ver tried to rip a DVD with Handbrake? Or compile VirtualBox from source? Give it a shot, let me know how it went. And idle (5-10%) is the only time that your fans won't spin. See what's getting the CPU higher than idle. There are similar tools that you can use on your guest 'top' being the simplest CLI, and 'System Monitor' being the GUI equivalent. Your preference may vary, but you can use either of them (I use all of them concurrently): What I do, is to have several monitor tools running at all times. Here are a couple of applications, so that you know what's available on your system at any given time. Wonder if anyone knows why that is?You know that the sole purpose that the fans exist, right? To spin. Limestone_lenny wrote:cause the fans to spin. Feb 2011, 02:54 Primary OS: Ubuntu other VBox Version: OSE other Guest OSses: win2K Wonder if anyone knows why that is?ДЄdapter Type: IntelPRO/1000 MT Desktop (default)ДЄny comments on these settings are welcome. However, browsers in Mint (Opera, Pale Moon) cause the fans to spin. After playing with settings, both guests are performing at what seems the same level. I noticed a performance lag compared with Parallels 10.4 hosting Ubuntu 15.04. This is VirtualBox 5.2.18 on OSX 10.10, hosting Mint 19.

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