https://www.displayfusion.com/Discussions/RSS/?TopicID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8 DisplayFusion RSS: DisplayFusion high CPU when Windows Defender is running a scan Sat, 11 Jul 2026 00:19:45 GMT en hourly 1 https://www.displayfusion.com/Discussions/RSS/?TopicID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8 https://www.displayfusion.com/Discussions/View/displayfusion-high-cpu-when-windows-defender-is-running-a-scan/?ID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8#4 Fri, 23 Sep 2022 11:20:47 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/displayfusion-high-cpu-when-windows-defender-is-running-a-scan/?ID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8#4 DisplayFusion Oh and I'll mention before I forget that I'm running the beta 17. ]]> https://www.displayfusion.com/Discussions/View/displayfusion-high-cpu-when-windows-defender-is-running-a-scan/?ID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8#3 Fri, 23 Sep 2022 11:18:26 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/displayfusion-high-cpu-when-windows-defender-is-running-a-scan/?ID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8#3 DisplayFusion Thanks. I'll try to gather some more info. ]]> https://www.displayfusion.com/Discussions/View/displayfusion-high-cpu-when-windows-defender-is-running-a-scan/?ID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8#2 Thu, 22 Sep 2022 14:02:55 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/displayfusion-high-cpu-when-windows-defender-is-running-a-scan/?ID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8#2 DisplayFusion I've moved this to a new thread. There are many different things that can result in high CPU, so trying to keep them separate as much as possible.

When your Windows Defender scan is running, is the CPU pretty much maxed out?

Also, are you looking at the CPU usage on the Processes tab or the Details tab in Windows Task Manager?

Thanks! ]]> https://www.displayfusion.com/Discussions/View/displayfusion-high-cpu-when-windows-defender-is-running-a-scan/?ID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8 Thu, 22 Sep 2022 11:45:04 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/displayfusion-high-cpu-when-windows-defender-is-running-a-scan/?ID=dfca8d1d-da6c-40ab-881f-57f49c7a36c8 DisplayFusion I'll mention it here since this a fairly recent thread: I particularly notice the high CPU when MS Defender is running a scan. MsMpEng.exe.. when that is running displayfusion seems to kick into high CPU mode for sure.

This is true event with Beta 17. Killing Displayfusion ruturns the lagginess to what I would call "normal" ]]>