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In the past I've noticed issues with performance that coincide with high memory use by the MsMpEng.exe service, which is the background 'real-time scanning' by Windows Defender. The problem seemed to go away, but now has returned over the last week. Thus far I have followed the advice from Answers Microsoft, changing Defender's Schedule and adding MsMpEng.exe to Defender's exceptions. However, the issue has persisted. I began booting things up step-by-step to see where the issue kicks in. When completely idle (no apps launched), the anti-malware service would run, but usually at a low level and if it did spike it wouldn't be as extreme as when playing Arma and would subside shortly. With Steam launched, the disk use rises (around 60-80% typical), with the service appearing to be the primary guzzler of disk use. However, shortly after launch things return to a 'stable' state. The same cannot be said once the launcher is run. Disk use spikes to 80-100%, with MsMPEng.exe being the primary consumer at between 60MB/s and 80MB/s. It continues to fluctuate for as long as I have the launcher open, even if I do nothing with it, and will subside once it is closed after a little while. I have tried adding the arma3launcher.exe service to Defender's exceptions and have restarted since...but Defender doesn't seem to be paying any attention. Would appreciate some advice on next steps from somebody a bit more familiar with such things. Cheers, Law