Since upgrading to the Windows 10 Anniversary Update, I noticed a strange occurrence, and my CPU Fan was always spinning up. I ignored it for some time now, but it started getting annoying over the past few weeks. It became quite a concern regarding possible damage to components in the system overheating. My suspicions focused on a possible process accessing more CPU cycles than usual. The solutions presented here might vary depending on your configuration, but they are worth a try if you are experiencing a similar problem.
Disable Processes Causing CPU Fan to Remain Constant
First, launch Task Manager, press Windows key + X > Task Manager then click the Processes tab. Click the CPU column to sort applications and processes by CPU cycles. Below, I noticed the System Host Process was regularly accessing CPU cycles at 30%, sometimes going as high as 36%. Expanding the System Host Process tree reveals quite some services running in the background. For me this was a trial and error, I noticed Geolocation Service was running, so I decided to disable it first. Surprisingly, it worked and the CPU fan stop revving up. Unfortunately, Geolocation restarted again. I tried a few times while ending the following services: Device Setup Manager, Computer Browser, Windows Update; none of it made any difference.
It became apparent none of these services were contributing to the high CPU cycles. Because I am on a metered Internet connection; I disable a lot of background apps and services to preserve mobile data. Some users experiencing issues with high CPU usage in Windows 10 have tried disabling some services such as Sync Settings and background apps. Click Start > Settings > Privacy > Background apps. Recommended background apps you can turn off include Weather, OneNote, Facebook and Twitter if you have those installed; I must admit, these didn’t make much of a difference either, but they might work for you.
I decided to seek some expert advice and was told to disable the Host Process for Setting Synchronization. You can easily find it under Task Manager > Users tab; expand your user account tree, select the Host Process for Setting Synchronization then click Disable. Unfortunately, this expert advice didn’t work either, but it turns out to be a popular resolution for many users experiencing this problem with high CPU cycles.
As a last resort, I decided to check the System Host Process tree again, because I felt this is where the problem exists. I noticed Windows Update was listed as a running service. Although I have Windows Update disabled because I am on a metered connection, I decided to look there. Nothing unusual; I have it set for Defer Feature Updates. Out of curiosity, I checked under Choose how updates are delivered. Noticing I had the option to get updates from more than one place enabled; I tried my luck and turned it off. What do you know, the problem finally disappeared? Since writing this article, I have not heard my CPU fan rev up.
This does not isolate other factors that might contribute to excessive CPU usage. Some users have reported sync settings located under Accounts can also trigger this behavior. Modifying what gets synced can reduce the impact of the CPU fan remaining on constant. Another process I notice triggers the CPU fan is IAStorDataSvc. IAStorDataSvc is associated with the Intel Rapid Storage Driver. When I initially upgraded to Windows 10 in 2015, I had to disable it each to time I started Windows 10 to prevent from triggering the CPU Fan. In a recent forum post, we detailed issues users were experiencing with IAStorDataSvc causing stability issues. With Windows 10 providing built-in support for AHCI, there is no need to install or keep IRST. So, if you happen to be experiencing freezes on the Windows 10 Anniversary Update, 1607, uninstalling it might resolve the problem.
Updating chipset drivers have also been reported to remedy the problem. Your web browser can be a factor too; Mozilla Firefox is notorious for causing the CPU fan to spin up. Check your web browser’s add-ons then disabling ones you don’t need might help. Also, reducing the amount of tabs you have open, especially if they are media based websites might help. Switching web browsers might be an option if you are constantly experiencing this with a particular browser. If you have “Hey, Cortana” turned on, and that is another culprit you can probably turn off. Other variables can include even application add-ons. I noticed when I used a Microsoft Word add-on, Grammarly; this triggered the CPU Fan which remained on constant even after exiting the application. There isn’t a silver bullet for this problem; hopefully, if you are experiencing a similar issue, trying some of these suggestions might help alleviate the problem.