In a previous job, I was benchmarking compile times. I came in on a Monday and everything was 10-15% slower. IT had installed carbon black on my machine over the weekend, which was clearly the culprit. I sent WPA traces to IT but apparently the sales guys said there was no overhead so that was that.

I used to think that was the worst, but then my org introduced me to pegging HDD write at 100% for half an hour at a time. My dad likes to talk about how he used to turn on the computer, then go get coffee; in my case it was more like turn on machine, go for a run, shower, check back, coffee, and finally... maybe.

Every Wednesday my PC becomes so slow it is barely usable. It is the Windows Defender scans. I tried doing a hack to put it on a lower priority but my hands are tied by IT.

Same. I had nearly full administrative privs on the laptop, yet I get "Access denied" trying to deprioritize the scan. We got new hardware recently, so we should be good until the scanners catch up and consume even more resources...

You basically have no control over it. I don't mind it doing a virus scan but could it do it out of hours.

People wonder why I don't run Windows outside of gaming and it because I don't really know what the system is doing anymore.