Counter Control 1.2

Counter Control is a small program that will monitor the fixed performance counters on Intel processors.

Microsoft's Windows Defender anti-virus software will sporadically take over all hardware performance counters and use them in a way that reduces system performance significantly. Using Counter Control you can identify this and mitigate it.

A more detailed writeup can be found here: https://www.techpowerup.com/295877/windows-defender-can-significantly-impact-intel-cpu-performance-we-have-the-fix.