The way to test a/v is easy enough, run a virus scan, then watch the cpu load whilst you doing it. I have not tested every single a/v but I have tested a lot of the mainstream ones and every one was scanning using only a single core.
Not true. Windows's own Virus scan.
It definitely loads more than one core:
![Windows-Scan-CPU-Load.png](https://i.postimg.cc/FKSzGD3K/Windows-Scan-CPU-Load.png)
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