What is Spooler SubSystem app & why the High CPU usage?

The Windows Task Manager, a watchdog for Windows processes helps you find processes which may be consuming high computer resources like high Disk usage, CPU, Memory, etc. In this post we will see what is Spooler SubSystem App & why does it at times give high CPU usage problems.

Spooler SubSystem App (spoolsv.exe)

Sometimes, upon launching Task Manager service, you may discover that the Spooler SubSystem App uses more than half of the CPU and over a gigabyte of memory. So what is Spooler System app in particular and why it is running on your PC? We’ll find answers to these questions in a while.

Spooler SubSystem App is a process that helps a user manage his printer and fax systems. Whenever a program sends a document to the printer, the spooler subsystem app adds it to the print queue. The Print Spooler service saves these print jobs in memory and sends them to the printer one by one when the printer is available. It only requires an internet access if you’re using the printer on your network.

Spooler Subsystem (spoolsv.exe)

In normal situations, the entire process proceeds as usual (as seen in the screenshot above) and shouldn’t use many of your computer’s resources. It will only use some CPU resources when printing, and that’s acceptable. However, at other times, there can be a significant amount of  CPU resource usage by the spoolsv.exe process. This is likely to occur when there’s an issue with Windows printing system. The possible scenarios could include a print queue is full of tasks or wrongly configured printer.

Spooler SubSystem app high CPU usage

The first thing you want to do is to run the Printer Troubleshooter and see if it helps you.

If it doe not, open the Control Panel. In the Control Panel double-click the Administrative Tools and then Services.

Within Services locate Print Spooler and right-click it and select Stop.

Once this process has been stopped, leave the Service Manager window open and Windows File Explorer and browse to the below folder.


windows 10

In this folder delete all the files in the PRINTERS folder to clear possibly jammed print jobs. Once these have been deleted, you can right-click the Print Spooler in the Services window and click Start to re-enable the service.

If this does not resolve your issue it’s likely you have an issue with your printer drivers you have installed for your printers. Manually update the Driver and make sure you have the latest printer drivers for your printer.

Trust this works for you!

Other posts about processes using high resources:

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Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.