Intel CPUs include three fixed function hardware performance counters for each thread. Here’s a simple explanation of the situation. Note this behavior has been reported so far with Intel 8th, 9th, 10th, and 11th gen CPUs on Windows 10 and 11. Thankfully Webb has created a free utility to resolve the issue, and it’s called Counter Control. In some cases it can result in up to six percent lower performance. Webb discovered that at random intervals Defender would suddenly begin using excessive CPU resources.
Windows Defender is the software included with Windows to protect your PC from malware and viruses. In the course of developing those programs he discovered a curious behavior in Windows Defender with Intel CPUs. Kevin Glynn, aka Uncle Webb at TechSpot, has developed several useful freeware utilities like ThrottleStop and RealTemp over the years.
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