Does a third monitor with no programs running in it have better performance in VM?












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I've been having terrible performance in a Windows VM at work with a new Lenovo P51s laptop in dock setup with two external monitors. With 32GB RAM and 500GB SSD, I first assumed the culprit to be the i7-7600U processor because I'm running two VM's at once, one Windows and one Linux, where a fair amount of work is being done in the Windows environment. In comparison, my previous 2017 Macbook Pro had no issue with this, had only 16GB of ram, but had a top end i7-HQ processor.



When things start to lag terribly, I open Task Manager within the Windows VM, CPU utilization will briefly sit at 100% and quickly drop to 25%-30%; Memory is around 87%-92%. If I minimize the VM's, the laptop itself seems to run smoothly. I've ran hardware diagnostics, tried different resource configurations to the VM's, etc. and nothing has made any noticeable difference until today.



This morning, I decided to only work within two external monitors. I still left my laptop open on it's dock with it's screen simply displaying the Windows wallpaper and taskbar. I went about my day as normal and- no lagging! Computer has been working great. So I decided to take my already open Slack and a Chrome instance and put them into the laptop screen, which is how I normally work. Within 20 minutes or so, my laptop started to stutter terribly and I was getting the horrible performance I normally do. I moved the two application windows back out of the laptop screen and into the monitors and- performance was fine!



Am I going crazy or is there a reason why this might make sense? I figure a third monitor/screen is a third monitor/screen, didn't matter what would be in there- desktop background or app instance (as long as I wasn't opening new programs, of course).



Note: If it helps, I am a professional developer and have been building PC's as a hobby for over a decade. I've tried a lot of tricks to try and understand what's going on with the performance here and this is the third lenovo laptop I've exchanged with this same issue.










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    I've been having terrible performance in a Windows VM at work with a new Lenovo P51s laptop in dock setup with two external monitors. With 32GB RAM and 500GB SSD, I first assumed the culprit to be the i7-7600U processor because I'm running two VM's at once, one Windows and one Linux, where a fair amount of work is being done in the Windows environment. In comparison, my previous 2017 Macbook Pro had no issue with this, had only 16GB of ram, but had a top end i7-HQ processor.



    When things start to lag terribly, I open Task Manager within the Windows VM, CPU utilization will briefly sit at 100% and quickly drop to 25%-30%; Memory is around 87%-92%. If I minimize the VM's, the laptop itself seems to run smoothly. I've ran hardware diagnostics, tried different resource configurations to the VM's, etc. and nothing has made any noticeable difference until today.



    This morning, I decided to only work within two external monitors. I still left my laptop open on it's dock with it's screen simply displaying the Windows wallpaper and taskbar. I went about my day as normal and- no lagging! Computer has been working great. So I decided to take my already open Slack and a Chrome instance and put them into the laptop screen, which is how I normally work. Within 20 minutes or so, my laptop started to stutter terribly and I was getting the horrible performance I normally do. I moved the two application windows back out of the laptop screen and into the monitors and- performance was fine!



    Am I going crazy or is there a reason why this might make sense? I figure a third monitor/screen is a third monitor/screen, didn't matter what would be in there- desktop background or app instance (as long as I wasn't opening new programs, of course).



    Note: If it helps, I am a professional developer and have been building PC's as a hobby for over a decade. I've tried a lot of tricks to try and understand what's going on with the performance here and this is the third lenovo laptop I've exchanged with this same issue.










    share|improve this question



























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      I've been having terrible performance in a Windows VM at work with a new Lenovo P51s laptop in dock setup with two external monitors. With 32GB RAM and 500GB SSD, I first assumed the culprit to be the i7-7600U processor because I'm running two VM's at once, one Windows and one Linux, where a fair amount of work is being done in the Windows environment. In comparison, my previous 2017 Macbook Pro had no issue with this, had only 16GB of ram, but had a top end i7-HQ processor.



      When things start to lag terribly, I open Task Manager within the Windows VM, CPU utilization will briefly sit at 100% and quickly drop to 25%-30%; Memory is around 87%-92%. If I minimize the VM's, the laptop itself seems to run smoothly. I've ran hardware diagnostics, tried different resource configurations to the VM's, etc. and nothing has made any noticeable difference until today.



      This morning, I decided to only work within two external monitors. I still left my laptop open on it's dock with it's screen simply displaying the Windows wallpaper and taskbar. I went about my day as normal and- no lagging! Computer has been working great. So I decided to take my already open Slack and a Chrome instance and put them into the laptop screen, which is how I normally work. Within 20 minutes or so, my laptop started to stutter terribly and I was getting the horrible performance I normally do. I moved the two application windows back out of the laptop screen and into the monitors and- performance was fine!



      Am I going crazy or is there a reason why this might make sense? I figure a third monitor/screen is a third monitor/screen, didn't matter what would be in there- desktop background or app instance (as long as I wasn't opening new programs, of course).



      Note: If it helps, I am a professional developer and have been building PC's as a hobby for over a decade. I've tried a lot of tricks to try and understand what's going on with the performance here and this is the third lenovo laptop I've exchanged with this same issue.










      share|improve this question
















      I've been having terrible performance in a Windows VM at work with a new Lenovo P51s laptop in dock setup with two external monitors. With 32GB RAM and 500GB SSD, I first assumed the culprit to be the i7-7600U processor because I'm running two VM's at once, one Windows and one Linux, where a fair amount of work is being done in the Windows environment. In comparison, my previous 2017 Macbook Pro had no issue with this, had only 16GB of ram, but had a top end i7-HQ processor.



      When things start to lag terribly, I open Task Manager within the Windows VM, CPU utilization will briefly sit at 100% and quickly drop to 25%-30%; Memory is around 87%-92%. If I minimize the VM's, the laptop itself seems to run smoothly. I've ran hardware diagnostics, tried different resource configurations to the VM's, etc. and nothing has made any noticeable difference until today.



      This morning, I decided to only work within two external monitors. I still left my laptop open on it's dock with it's screen simply displaying the Windows wallpaper and taskbar. I went about my day as normal and- no lagging! Computer has been working great. So I decided to take my already open Slack and a Chrome instance and put them into the laptop screen, which is how I normally work. Within 20 minutes or so, my laptop started to stutter terribly and I was getting the horrible performance I normally do. I moved the two application windows back out of the laptop screen and into the monitors and- performance was fine!



      Am I going crazy or is there a reason why this might make sense? I figure a third monitor/screen is a third monitor/screen, didn't matter what would be in there- desktop background or app instance (as long as I wasn't opening new programs, of course).



      Note: If it helps, I am a professional developer and have been building PC's as a hobby for over a decade. I've tried a lot of tricks to try and understand what's going on with the performance here and this is the third lenovo laptop I've exchanged with this same issue.







      windows-10 laptop memory virtual-machine multiple-monitors






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      edited Jan 8 at 0:57







      8protons

















      asked Jan 8 at 0:52









      8protons8protons

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