7 Reasons Why Your Computer is Running Slow with Windows 10

Unlike every other device, Windows PCs also require maintenance and optimization. You may observe that your PC is running slow and halting on freezing windows as you use the system. There can be numerous reasons that can make your PC run slower; however, when I got my PC diagnosed and asked why my PC is running slow, these were the top reasons for my PC performance.

Too Many Startup Programs

Suppose your PC is running slow while Windows 10 boots. It would help if you considered checking your startup programs. Too many startup programs can take up a lot of time to boot and hampers the PC performance. Whenever you install a program, it by-default adds itself to the startup item list.


You need to get into the startup console and uncheck programs that you don’t wish to load while booting your OS. Press (Win + R) and type msconfig.exe. Click on the Startup tab on the top of the new window and follow the link to open Task Manager. Select the program and click on the Disable button at the bottom of the window.

Hard Drive Running Out of Space

Taking repeated backups of our smartphone, digital-camera, downloads, movies, and videos can make you run out of space even on a brand-new computer. A filled hard drive will always make your PC running slow. A 95% full hard drive can slow down your computer by 50%. When the drive runs out of space, the system can’t install Windows Updates or download temporary cache files that halt the browser and overall system performance.


Regular cleaning and optimization of the drive are necessary to keep it clean. Remove temporary files, cache, cookies, browser history, clear Recycle Bin, uninstall unwanted programs, move files to an external backup drive, run Disk Cleanup, PC cleaner, Disk Defragmentation, and other pc optimization utilities for windows.

Running Too Many Programs at a Time

Computers are built to multitask; however, if you are multitasking and juggling multiple programs, you need to ensure that your system doesn’t run out of Memory. If you have limited RAM and cannot run multiple programs or outstripping your computer’s processing power, all the programs will be stuck and give a sluggish performance.


The quickest fix to this situation is to get into the Task Manager and close programs that are pushing the bars. Press (Ctrl + Shift + Esc) key combination, and the Task Manager window will open. You will see all the running processes. You can sort them by ‘Memory’ and exit the ones taking up a lot of memory. Select the program and click on the ‘End Task’ button.

Multiple Browser Tabs Open

We mostly browse multiple websites while searching for particular information and open up dozens of browser tabs for a perfect reference. Every tab consumes a lot of memory, cache files, temporary files and burdens up the memory usage. Along with the tabs, extensions and ad-ones also run in the background. These tabs auto-refresh in the background and takes up data usage on the other hand.


If you find a page relevant and informative, bookmark the page and add it to your favorites list. While hunting down information, use a light browser like Opera or Brave to reduce memory usage. You can alternatively use your primary browsers and randomly keep on clearing cache, cookies, and temp files often—close unwanted tabs instead of quitting the application directly.

Continuous Virus Scans

If you are using additional antivirus software set up for real-time scan, it may busy up the processor. Deep scans also put a lot of pressure on the RAM and processor. If you are already multitasking while the antivirus scan is running in the background, it can lead to the PC running slow, and system crashes.


Windows 10 is a robust operating system with inbuilt Windows Defender that works as a perfect security solution. You don’t need additional security software. If you still use a security program, you can schedule scans at a time when the system is in an idle state.

Outdated Drivers or Updates

If you do not update your drivers regularly or check for Windows updates, some programs or applications may stop responding, or you may experience freezing screens. If your PC is running slow with Windows 10 and you are getting error messages for outdated device drivers or pending Windows Updates, it’s time to install them.


Check device manager for outdated drivers. If there is a yellow exclamation mark, there is some problem with faulty drivers. Download and install the latest drivers from the manufacturer’s website. Go to Windows Update & Security and scan for Windows Updates. Install the most recent Windows Updates for a smooth transition.

Too Many Installed Application

Installing too many applications takes up a lot of space on the same drive as your operating system. If you have C: D: E: drives and your operating system is on C: Drive, you should keep a minimum of 50% FREE space. Multiple installed programs will create different folders and subfolders, registry directories, and entries and burden the index file. This software also takes up resources for automatic software updates.


If you haven’t used a program for over a month, it’s not worth keeping. You can uninstall the program and reinstall it back once needed—Transfer unwanted files or folders on other drive partition that doesn’t have your OS.

Summing Up

There can be numerous other reasons if your PC is running slow with Windows 10. Your computer could be infected with a virus, spyware, or malware. Your Memory is not sufficient to run multiple programs at a time. The system is in low power mode. You haven’t restarted the PC for weeks, you have rogue programs hogging up system resources, or you have themes, special visual effects, or live wallpapers turned ON. If you can’t fix all these issues on your own, use one of the best PC optimization software to keep it tuned up, optimized, and clean.

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