8 Reasons for Computer Lagging and How to Fix It

The issue of computer lagging is really painful for many Windows users. It may happen unexpectedly when you are watching videos, playing games or using programs. What’s the worse, computer may keep freezing sometimes.

As a result, the lagging computer may affect its performance in different ways, like programs opening and running slow, upload or download speed deceasing, Windows errors appearing, OS needing long time to load or shut down, etc.

In a word, everything on your computer is becoming slower and slower. It will cost you much time to wait. Then, this question will be raised – how to stop the computer from lagging? To find the solutions, please go on reading.

Here, we have summarized 8 common reasons for computer lagging and corresponding solutions to fix your slow computer.

8 Reasons for Computer Lagging and Corresponding Solutions

To solve your lagging computer effectively, it is necessary to make sure what the cause is for computer slowing down. Well, let’s go to see how to fix a lagging computer and speed up its performance.

1. A Bottlenecked CPU

A CPU will get bottlenecked when the processor doesn’t have enough power to meet the task demands. And an outdated and overheated CPU may lead to high CPU usage, and it can cause computer lagging or freezing. In other words, if the CPU performance is better, the faster your computer works. 

How to fix:

To identify if the CPU is running with poor performance or not, you can make a CPU stress test with System Monitor. Once it is has poor performance, just replace the old processor or even the CPU with a new one.

2. Faulty Hard Drive

Your Windows computer may lag or freeze as long as the hard drive (especially the system disk) gets faulty due to some logical errors or bad blocks. How to solve it?

How to fix:

Under this circumstance, you’d better scan the drive to check and fix the errors with a professional disk manager.  

MiniTool Partition Wizard is a perfect choice to help you finish this work. Just download and intall it on your computer. Then run it and select the task disk to have the Surface Test like the screenshot shown below.

Or you can replace the old or problematic hard drive with a new one.

3. Too Many Startup Programs

When you download and install too many programs, your computer may slow down as most newly downloaded programs are want permission to start when the computer starts. After the computer boots, these programs are actually running in the background. So, the computer will run slow.

How to fix:

To prevent the start-ups from starting automatically, you can go to start-up tap to disable to unwanted ones. In this way, the computer performance will be improved.

4. Corrupted or Insufficient RAM

If the RAM is corrupted or insufficient, computer performance will be influenced, making computer random restart or causing blue screen. When the RAM is broken, it can’t satisfy the needs or processes. Then, the computer lags. 

How to fix:

Once making sure the insufficient RAM is the cause for computer lagging, the most feasible way to fix this problem is to upgrade RAM to improve computer performance. If it doesn’t help, replace it with a new one.

5. Outdated Drivers

When the drivers are out of date, hardware or software issues may happen frequently, which result in computer lagging.  

How to fix:

It is easy to deal with it when figuring out old driver is the reason for computer lagging problem.   In this case, you just need to upgrade the old drivers to the newest version.

6. Outdated Operating System 

If your operating system can’t be maintained or upgraded periodically, it’s certain that a number of programs are installed on computer drive. As time goes by, your computer will lag no matter it is new or not.

How to fix:

You should upgrade the operating system timely to make your computer run smoothly and it is also helpful to fix the problems, such as computer lagging.

7. Insufficient Storage Space

Free hard drive space is space on the hard drive where is not in use and can be written. The free space is not only used to store data, but also functions swap file space and virtual memory of running programs.

How to fix:

Run a deep clean to remove the useless and unwanted files, programs and temporary files to make more free space on hard drive. Transfer or back up the important files to other storage space is also workable.

8. Virus Infection

Except for the reasons mentioned above, virus is a commonly seen cause for computer lagging. Maybe your computer is invaded by some viruses and they are running unknowingly in the background.

Virus can bring harm to the data in the computer, like saved files, sensitive information (username and password) and financial information. You may suffer data loss or computer lagging due to virus infection.

How to fix:

Installing antivirus programs and running the antivirus scan regularly is very important. Of course, except for antivirus programs, making data backup is also necessary to keep the vital files safe.     

Right now, run the antivirus to full scan your computer and remove the virus. Then, check whether your computer is still lagging.


So, if your Windows computer runs slow or freezes, there is no need to worry any more. This post shares 8 common reasons for computer lagging and the solutions with you. So, just try the methods to fix the problem.

In addition to these solutions, you may consider your computer status. If it is really old, it will not work with ideal performance. Lagging or freezing is common. Thus, upgrading the CPU or purchase a new computer is the most direct solution.


Admin is a dedicated author of PureTech Blog. He has been doing the right way by covering various topics related to Technology and the Internet. His forte is to analyze the latest technological trends, a trait you can see in his writing.

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