Why does my computer get slower the more I use it?
After using their computers for a while, many people experience problems such as slow startup times, slow application opening, laggy browsers, noisy fans, overheating, or even simple tasks taking several seconds to respond. This is why the phrase 'computer running slow how to fix' is searched so frequently, especially by users of Windows, MacBooks, office laptops, and home PCs.
A slow computer isn't always due to a 'broken machine'. In many cases, the cause stems from a nearly full hard drive, too many applications starting with the system, outdated software, malware, too many tabs open in the browser, or hardware that no longer meets current needs. Microsoft also lists common causes such as limited storage space, too many background applications, outdated software, or hardware that is no longer suitable for modern performance requirements.
This article will help you understand how to fix a slow computer in an easy-to-apply way: starting with simple, safe, and free steps, and then moving on to hardware upgrades if absolutely necessary.
Signs that your computer is running unusually slowly.
Before attempting repairs, you need to identify the type of slowness. Some common signs include: the computer takes longer than usual to boot up, the desktop takes a long time to load, applications open slowly, the cursor is jerky, videos freeze, the browser is responsive, the fan runs loudly even with only a few tabs open, or the hard drive is always at 100% usage.
On Windows, you can quickly check using Task Manager . Microsoft recommends using Task Manager to monitor CPU, memory, disk, and resource-intensive processes. On Mac, you can use Activity Monitor to see which applications are using a lot of memory or CPU; Apple also recommends checking Activity Monitor when your Mac is running slowly.
If your computer is only slow when opening a browser, the problem might be with Chrome, Edge, Firefox, or Safari. If it's slow right from startup, the cause is usually startup apps, a full hard drive, an old HDD, faulty drivers, or security software scanning.
Common reasons why computers run slowly
- Too many applications start with the system.
Many programs automatically add themselves to the startup list: chat applications, cloud storage, game launchers, update tools, printer software, VPNs, audio managers, or laptop manufacturer utilities. When the computer is turned on, they all run simultaneously, overloading the RAM, CPU, and hard drive.
On Windows, open Task Manager > Startup apps and disable any apps that don't need to start automatically. On Mac, go to System Settings > General > Login Items to check which apps open when you log in.
- Your hard drive or SSD is nearly full.
Low storage space can noticeably slow down your computer. Microsoft recommends using Storage Sense and a temporary file cleaner to free up space on Windows. Apple also states that insufficient free space on a Mac's boot drive can slow it down, and suggests using the Storage section in System Settings to optimize space usage.
Delete old downloads, unnecessary videos, used installation files, duplicate photos, the Recycle Bin, and browser cache. If your C drive on Windows or startup disk on a Mac is nearly full, cleaning it up can make a big difference.
- The computer is infected with malware or unwanted software.
Malware can silently consume CPU, RAM, network, and disk space. Microsoft states that malware can consume CPU and disk resources, thereby reducing system performance. If your computer suddenly slows down, your browser opens strange pages, unusual ads appear, or there are strange processes in Task Manager, scan for security immediately.
On Windows, you can use Windows Security > Virus & threat protection > Quick scan . If you suspect hidden malware, Microsoft also recommends using Microsoft Defender Offline scan in some cases where malware is detected again after restarting.
- The browser is too slow.
Chrome, Edge, or Firefox can use a lot of RAM when you have many tabs, extensions, web apps, videos, social media, and work tools open simultaneously. Google recommends updating Chrome, closing unused tabs, disabling or removing unnecessary extensions, and using Chrome Task Manager to stop resource-intensive tasks.
If your computer is only slow when browsing the web, check the number of tabs, ad-blocking extensions, shopping extensions, VPNs, automatic translation extensions, and background web apps.
12 ways to fix a slow computer
Method 1: Restart your computer
It sounds simple, but restarting is the first step you should take. When a computer runs continuously for days, RAM can become occupied by old processes, crashed applications, or incomplete system updates. Microsoft also recommends closing unused applications and restarting your PC if performance doesn't improve.
Try restarting your computer instead of just putting it to sleep. After restarting, only open the applications you really need to see if your computer is faster.
Method 2: Update Windows, macOS, and drivers.
Operating system updates typically include bug fixes, security improvements, and performance optimizations. Microsoft states that Windows Updates usually include bug fixes and performance enhancements. On Macs, Apple also recommends that users keep macOS updated, as indicated in its Mac support resources.
On Windows 11: go to Settings > Windows Update > Check for updates .
On Mac: go to System Settings > General > Software Update .
For drivers, especially graphics, Wi-Fi, chipset, and storage drivers, prioritize official sources from Windows Update, the laptop manufacturer, or the component manufacturer.
Method 3: Disable applications from starting with your device.
This is one of the most noticeable ways to speed things up. On Windows, press Ctrl + Shift + Esc , go to the Startup apps tab , and then disable unnecessary applications such as game launchers, updaters, secondary chat apps, and rarely used synchronization tools.
On a Mac, go to System Settings > General > Login Items and remove any applications that you don't need to open immediately upon logging in. Then restart your computer to check your startup speed.
turn off startup apps computer running slow how to fix.
Method 4: Free up disk space
If your hard drive has too little space, your computer may slow down when updating, opening applications, caching, or processing temporary files. On Windows, go to Settings > System > Storage , run Storage Sense , delete temporary files, and check your Downloads folder. Microsoft recommends using Storage Sense and cleanup tools to delete temporary files when low space reduces performance.
On a Mac, go to System Settings > General > Storage to see optimization suggestions, move files to an external drive, or delete unnecessary files. Apple states that macOS can help optimize space by storing files in the cloud and helping identify files that are no longer needed.
Method 5: Uninstall unused software
Outdated software not only takes up space but can also run in the background, add services to your system, or install browser extensions. Uninstall games you don't play, trial software, apps optimized from unknown sources, browser toolbars, and printer bundled extensions if you don't need them.
On Windows: Settings > Apps > Installed apps .
On Mac: Open Applications , drag the app without going to the Trash, or use the official uninstaller if the app has one.
Method 6: Check for malware and unfamiliar software.
If your computer is unusually slow, perform a security scan. On Windows, open Windows Security > Virus & threat protection > Quick scan . If the problem persists, run a full scan or a Microsoft Defender Offline scan . Microsoft notes that a full scan can take a long time, especially if the drive is large or contains many compressed files such as ZIP files.
You should avoid downloading "one-click computer speed booster" software from unknown sources. Many of these programs may add ads, modify your browser, or even slow down your computer.
Method 7: Reduce the number of browser tabs and extensions.
If you're looking for ways to fix a slow computer because your browser is lagging, start with Chrome or your current browser. Google recommends closing unused tabs because the more tabs open, the more Chrome has to work. Google also suggests disabling or deleting unused extensions to speed up Chrome.
In Chrome, go to More > Extensions > Manage Extensions to disable unnecessary extensions. You can also open Chrome Task Manager to see which tabs or extensions are using a lot of RAM.
Method 8: Check for applications that are consuming excessive CPU, RAM, and disk space.
On Windows, open Task Manager and sort by CPU, Memory, or Disk. If you see any applications that consistently use high resources even when you're not using them, close or uninstall them. Microsoft recommends monitoring your CPU, memory, and disk to identify processes that are slowing down your PC.
On a Mac, open Activity Monitor. Apple recommends using Activity Monitor to see how much memory your Mac and applications are using when your machine is running slowly.
Common applications that cause system slowdowns include photo/video editing software, multi-tab browsers, virtual machines, game launchers, cloud synchronization software, and online meeting tools.
Method 9: Turn off unnecessary visual effects.
Low-spec computers may slow down when many interface effects are enabled. On Windows, find Adjust the appearance and performance of Windows , select Adjust for best performance , or manually turn off unnecessary effects. On Mac, go to Accessibility > Display and consider enabling Reduce motion or Reduce transparency if your machine is older.
This method won't turn a weak machine into a powerful one, but it can make the interface more responsive.
Method 10: Checking an old HDD
If your computer is still using an HDD, this could be the biggest reason for its slowness. HDDs have significantly lower read and write speeds than SSDs, especially when booting Windows, opening applications, or updating the system. With older laptops, upgrading from an HDD to an SSD often provides a more noticeable speed improvement than even upgrading RAM in many cases.
Signs of a problematic hard drive include very slow boot times, the drive frequently reaching 100% usage, clicking noises, slow file copying, or the computer freezing when opening folders.
Method 11: Upgrade your RAM if you frequently run out of memory.
If you have many Chrome tabs open, are using demanding applications like Excel, Photoshop, Premiere, AutoCAD, virtual machines, or games, low RAM will cause your computer to use the hard drive as temporary storage, slowing it down. On Windows, check the Performance > Memory tab in Task Manager. On Mac, check Memory Pressure in Activity Monitor.
For basic office needs today, 8GB of RAM is a relatively good minimum; 16GB is more suitable if you multitask, study online, open many tabs, or use creative software. With Apple Silicon Macs, you need to consider this from the moment of purchase because many models cannot have their RAM upgraded later.
Method 12: Reinstall the operating system or upgrade your computer when necessary.
If you've tried cleaning up, updating, scanning for malware, and disabling startup apps, but your computer is still slow, you might consider resetting Windows or reinstalling macOS. However, be sure to back up your data first.
Microsoft notes that older computers with outdated hardware may not see significant improvement after optimization steps, and in that case, upgrading the equipment may be a better long-term solution.
upgrade SSD RAM to fix slow computer.
Quick response chart for each situation
Mistakes to avoid when fixing a slow computer.
Don't delete system files if you're unsure what they are. Don't permanently disable Windows Update, as updates may contain security patches and performance improvements. Don't install multiple antivirus programs at the same time, as they can conflict and slow down your computer. Don't believe advertisements that promise '500% faster computer performance' or 'fix all problems with one click'.
Furthermore, you shouldn't just focus on cleaning up software junk files if your hardware is too old. A laptop with a low-capacity HDD, limited RAM, and an outdated CPU may need an SSD upgrade or a complete system replacement to achieve more stable performance.
Checklist for optimizing your computer in 30 minutes.
If you want to process it quickly, follow these steps in order:
- Restart the computer.
- Update Windows/macOS and your browser.
- Turn off unnecessary startup apps.
- Clean up your hard drive and delete temporary files.
- Uninstall unused software.
- Scan for malware.
- Close the browser tab and delete any unfamiliar extensions.
- Check Task Manager or Activity Monitor.
- If it's still slow, consider upgrading your SSD/RAM.
- Back up your data before resetting or reinstalling the operating system.
FAQ: Frequently Asked Questions about a Slow Computer
Why is my computer running slow even though it's brand new?
Even new computers can be slow if there's too much pre-installed software, applications that start with the system, updates running in the background, or if the hard drive fills up quickly. Check your Startup apps, Windows Update, and storage space.
Is a slow computer caused by a virus?
It's possible, but not always the case. Malware is a common cause because it can consume CPU and disk space, but slow performance can also be due to insufficient RAM, a full hard drive, a resource-intensive browser, or outdated hardware. Microsoft recommends running a malware scan when your PC is slow to detect and remove threats.
Does cleaning up junk files on your computer make it faster?
Yes, if your computer is running low on storage or has too many temporary files. However, if the cause is a slow HDD, insufficient RAM, or an outdated CPU, cleaning up junk files will only partially improve the situation.
Should I upgrade RAM or SSD first?
If your computer still uses an HDD, prioritize upgrading to an SSD first. If your computer already has an SSD but frequently runs out of RAM when opening many tabs or heavy software, upgrading the RAM would be more sensible.
How do I fix it if Chrome is slowing down my computer?
Update Chrome, close unused tabs, disable unnecessary extensions, and use Chrome Task Manager to stop heavy tasks. These are the steps Google recommends to speed up Chrome on your computer.
What's the first thing to do if your Mac is running slowly?
Check your startup disk space, close unused applications, use Activity Monitor to find memory-intensive apps, and use Disk Utility if you suspect a hard drive issue. These are the troubleshooting steps Apple recommends when your Mac is running slowly.
Conclude
A slow computer reduces productivity for studying, working, and entertainment. The good news is that most cases can be improved with simple steps such as restarting, updating the operating system, disabling startup apps, cleaning up the hard drive, scanning for malware, closing browser tabs, and checking for resource-intensive applications.
If your computer is still slow even after optimizing the software, consider the hardware. Upgrading the SSD, increasing RAM, or replacing components might be a more sensible solution than trying to fix an outdated system.
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