Fix: LockAppHost.exe Uses a Lot of Memory in Windows 10

Ivan Jenic By: Ivan Jenic
3 minute read
fix LockAppHost.exe high CPU

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Various things could cause a high memory usage not just in Windows 10, but also in all previous versions of Windows. This time, a couple of Windows 10 users complained online about how they found out that the LockAppHost.exe process is causing a high CPU usage without any particular reason.

So in this article, we’ll try to solve this issue, as we prepared a few possible solutions for memory leak in Windows 10, caused by LockAppHost.exe.

How to Prevent LockAppHost from Using a Lot of Memory

  1. Restart LockAppHost service
  2. Run SFC Scanner
  3. Check for viruses
  4. Lock and unlock your computer
  5. Disable Windows 10’s lock screen

Solution 1 – Restart LockAppHost service

Simple restarting LockAppHost process could potentially solve the problem, so that’s what we’re going to try first. To restart LockAppHost process, do the following:

  1. Go to Search, type services.msc, and open Services
  2. Find LockAppHost service, right-click on it and go to Properties
  3. Click on Stop, and then click on Start again
  4. Restart your computer, and see if LockAppHost is still ‘eating’ your memory

If restarting the process didn’t get the job done, we have a few more old school solutions for you.

Solution 2 – Run SFC Scanner

SFC Scanner is old Windows’ own tool for diagnosing and solving various system-related problems. So we’ll try to use SFC scanner to solve our problem, as well. To run SFC Scanner in Windows 10, do the following:

  1. Right-click on the Start Menu, and go to Command Prompt (Admin)
  2. Enter the following line and press Enter: sfc/scannowlockapphost problem windows 10
  3. Wait for the process to finish (it might take a while)
  4. Restart your computer, and see if the problem is resolved

Solution 3 – Check for viruses

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Some IT experts often connect high CPU usage caused by LockAppHost with a virus, or some kind of other malicious software. So, it won’t hurt if you run your antivirus program and completely scan your system for any suspicious activities. If you don’t use an antivirus program on your computer, scanning your system with Windows Defender can also get the job done, but if you want deep, more detailed scan, some third party software is probably the best option.


For various PC problems, we recommend this tool.

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

  1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
  2. Click “Start Scan” to find Windows issues that could be causing PC problems.
  3. Click “Repair All” to fix all issues with Patented Technologies (requires upgrade).

If you still didn’t decide which antivirus program you want to use, check out the list of the best antivirus programs for Windows 10, it will certainly help you to make the right decision.

Solution 4 – Lock and unlock your computer

If LockAppHost.exe is draining your computer memory, try locking your device and then log back in. Many users confirmed that this basic workaround helped them solve the problem.

I have the same problem, and the last time I investigated it seemed to have something to do with the lock screen modal. I locked my machine (Win + L) and re-logged in, and it went away

Solution 5 – Disable Windows 10’s lock screen

This solution requires a bit of patience, but some users confirmed it works, so it’s worth trying it. By disabling Windows 10’s lock screen you can resume your Windows session much faster and jump straight to the log in screen.

Here are the steps to disable the LockApp folder:

  1. Launch File Explorer > navigate to go to C:Windows > SystemApps > Microsoft.LockApp_cw5n1h2txyewyMicrosoft.LockAp
  2. Right-click on the folder > select Rename.
  3. Add .bak to the end of it the folder name > hit Enter.

Keep in mind that this solution doesn’t permanently remove the lock screen. When you reboot your PC, the lock screen will be there, but it won’t appear when you wake it up from sleep.

That’s about it, I hope at least some of these solutions helped you to reduce the high CPU usage on your Windows 10, if you have any comments, or questions, just reach for the comments, below.


Editor’s Note: This post was originally published in December 2015 and has been since completely revamped and updated for freshness, accuracy, and comprehensiveness.


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For various PC problems, we recommend this tool.

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

  1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
  2. Click “Start Scan” to find Windows issues that could be causing PC problems.
  3. Click “Repair All” to fix all issues with Patented Technologies (requires upgrade).

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