Daylight Saving Time (DST), also daylight savings time or daylight time and summertime is the practice of advancing clocks during warmer months so that darkness falls later each day according to the clock. If you notice high CPU and memory usage in Windows 11/10 when DST is configured, then this post is intended to help you. In this post, we will identify the possible cause and then offer the corresponding workaround as well as the solution you can try to remediate the issue.
Let’s look at a typical scenario where you can encounter this issue of the DST setting causes high CPU & memory usage on Windows 10.
You have a computer that’s running Windows 10 to use a time zone where daylight saving time (DST) changes occur at midnight instead of at 2:00 AM. In this situation, you may experience the following issues.
The TaskHostw.exe process consumes 100 percent of CPU resources. Therefore, system performance and battery life decrease dramatically. This issue may affect thermal management on small form factor devices, as the process keeps running in a loop doing time conversion calculations.
The pagefile consumes excessive disk resources, which triggers high disk utilization.
Excessive memory use occurs.
Excessive disk, CPU, or memory use causes the computer to hang or freeze.
Daylight Saving Time setting causes high CPU & memory usage
This issue of the Daylight Saving Time (DST) setting causes high CPU & memory usage on Windows 11/10 because of a race condition in the TaskHostW.exe process (a generic host process for Windows services) that runs one of the energy.dll scheduled tasks. This scheduled task runs according to the time set on the computer. This issue occurs only on the day when DST changes.
The energy.dll file is loaded when DST changes occur at midnight instead of 2:00 AM.
If you’re faced with this issue, try our recommended solution or workaround (per your requirement) described below to mitigate the issue.
To resolve this issue, upgrade your computer to the latest version of Windows 10.
If, for one reason or the other, you prefer to stay on your current Windows install and not upgrade or upgrade to the latest version of Windows or you’re already running the most current version of Windows. Still, the issue is not resolved. You can try the workaround offered below.
To work around the issue, you need to disable the Power Efficiency Diagnostics task by using one of the following methods.
- Use the Task Scheduler UI (User Interface)
- Use the Command Prompt
Let’s look at the description of the steps as it concerns each of the methods to resolve the DST setting that causes high CPU & memory usage on Windows 10.
1] Use the Task Scheduler UI (User Interface)
To use the Task Scheduler to disable the Power Efficiency Diagnostics task, do the following:
- Press Windows key + R to invoke the Run dialog.
- In the Run dialog, type taskschd.msc and hit Enter to open the Task Scheduler console.
- In the Task Scheduler console, navigate to the following:
Task Scheduler Library > Windows > Power Efficiency Diagnostics
- In the middle pane, select and right-click AnalyzeSystem.
- Click Disable.
You can exit the Task Scheduler console.
Read: How to Automatically adjust clock for Daylight Saving Time in Windows
2] Use the Command Prompt
To use the Command Prompt to disable the Power Efficiency Diagnostics task, do the following:
- Press Windows key + R to invoke the Run dialog.
- In the Run dialog box, type cmd and press CTRL + SHIFT + ENTER to open Command Prompt in admin/elevated mode.
- Copy and paste the command below in the command prompt window and press Enter.
schtasks /Change /TN "\Microsoft\Windows\Power Efficiency Diagnostics\AnalyzeSystem" /DISABLE
You can now exit the command prompt once the command executes. But you can query the status of the task to confirm that the changes have been applied by running the following command:
schtasks /Query /TN "\Microsoft\Windows\Power Efficiency Diagnostics\AnalyzeSystem"
The output should appear as follows:
Folder: \Microsoft\Windows\Power Efficiency Diagnostics
TaskName Next Run Time Status
===================== =========== ===============
AnalyzeSystem N/A Disabled
After completing the workaround or the solution itself, the issue of high CPU & memory usage on Windows 10 caused by the Daylight Saving Time (DST) setting should be resolved.
How do I turn off daylight savings on my computer?
In Windows, you can turn off daylight savings on your PC when setting up the clock. Go to Settings > Time & language > Date & time. Set it manually and then turn off the toggle next to the Adjust for daylight saving time automatically. Usually, if you have selected the correct region, you don’t need to do anything, or if the Set time is automatically turned on, it works fine.
Do computers change time automatically?
Yes, they do, based on the selected region and time zone. However, if you move to a different region, you must change accordingly. It’s essential to have a time zone that matches the WIFI or Ethernet work, as some applications depend on it. That said, you can always use additional clocks to track multiple timezones.