Start with the Easiest Fix: Restart and Check What's Running

The single fastest way to improve computer speed is to restart your machine. When your computer runs for days or weeks without shutting down, temporary files pile up in memory and background processes slow everything down. A full restart clears that clutter in seconds.

Before you restart, open your Task Manager (Windows) or Activity Monitor (Mac) to see what programs are actually running. On Windows, press Ctrl+Shift+Esc. On Mac, press Command+Space, type "Activity Monitor," and press Enter. Look for programs using high CPU or memory percentages — these are the speed killers. If you see something you don't recognize or don't need running right now, select it and click "End Task" or "Force Quit." Then restart your computer.

Key Takeaways

  • Restart your computer first, then check Task Manager or Activity Monitor to close programs consuming high CPU or memory.
  • Uninstall programs you no longer use, especially browser extensions and startup programs that load automatically when your computer turns on.
  • Delete temporary files using Disk Cleanup (Windows) or by emptying your Downloads folder and Trash regularly.
  • Update your operating system and drivers, because outdated software often runs slower and less efficiently than current versions.
  • If your hard drive is nearly full, delete large files or move them to external storage, since a full drive slows read and write speeds significantly.

Remove Programs and Browser Extensions You Don't Use

Every program installed on your computer takes up space and may run in the background without you knowing. Browser extensions — those small tools that add features to Chrome, Firefox, or Edge — are particularly heavy on speed. Open your browser settings, find the Extensions or Add-ons section, and remove anything you haven't used in the past month.

For installed programs, go to Settings > Apps > Apps and Features (Windows) or Applications folder (Mac), and uninstall anything you don't actively use. Pay special attention to programs that start automatically when your computer boots up. On Windows, open Task Manager, click the Startup tab, and disable programs you don't need launching at startup. On Mac, go to System Settings > General > Login Items and remove programs from the list.

Clear Out Temporary Files and Free Up Disk Space

Your computer stores temporary files while you work — cache from websites, old update files, and fragments from deleted programs. These accumulate and take up gigabytes of space. On Windows, type "Disk Cleanup" into the search bar, select your main drive, and check the boxes for Temporary Files, Recycle Bin, and Temporary Internet Files. Click Clean Up System Files to remove them.

On Mac, the easiest approach is to empty your Trash (right-click the Trash icon and select Empty Trash), then go to your Downloads folder and delete files you've already installed or no longer need. If your hard drive is more than 85% full, your computer will slow down noticeably. Check how much space you're using by going to Settings > System > Storage (Windows) or Apple menu > About This Mac > Storage (Mac). If you're running low, move large files like videos or photos to an external hard drive or cloud storage.

Update Your Operating System and Drivers

Outdated software runs slower because it hasn't received performance improvements and bug fixes. Check for updates by going to Settings > Update & Security > Windows Update (Windows) or System Settings > General > Software Update (Mac). Let your computer install updates and restart if needed — this often produces a noticeable speed improvement.

Drivers are the software that lets your operating system talk to your hardware like your graphics card or network adapter. Outdated drivers can cause slowdowns and crashes. On Windows, right-click the Start button, select Device Manager, and look for any devices with a yellow warning triangle. Right-click those devices and select Update Driver. On Mac, updates usually come through the main Software Update, so you don't need to hunt for drivers separately.

Check for Malware and Viruses

Malware and viruses run silently in the background, consuming CPU and memory while stealing your data. If your computer suddenly became slow, malware is a real possibility. Windows comes with Windows Defender built in — go to Settings > Privacy & Security > Virus & Threat Protection and click Scan Options, then select Full Scan. This takes 30 minutes to an hour but will catch most threats.

On Mac, malware is less common but still possible. The built-in Xprotect runs automatically, but you can also read Malwarebytes (free version) and run a scan. If a scan finds threats, follow the prompts to remove them, then restart your computer. After removing malware, you'll often see a significant speed improvement because those background processes are no longer running.

Upgrade Your RAM or Switch to a Solid State Drive

If your computer is still slow after trying the steps above, the problem may be hardware rather than software. RAM (memory) is what your computer uses to run programs. If you only have 4 GB of RAM and you're running multiple programs, your computer will slow to a crawl. Check how much RAM you have by going to Settings > System > About (Windows) or Apple menu > About This Mac (Mac). If it's 4 GB or less and your computer is more than five years old, upgrading to 8 GB or 16 GB can make a dramatic difference.

A Solid State Drive (SSD) is faster than an older Hard Disk Drive (HDD). If your computer still uses a traditional hard drive, replacing it with an SSD is one of the most effective upgrades you can make. An SSD makes your computer boot faster, programs launch faster, and files open faster. You can check your drive type in Settings > System > Storage > Advanced Storage Options (Windows) or by clicking the Apple menu > About This Mac > Storage (Mac). If you see "HDD" listed, upgrading to an SSD will noticeably speed up your machine.

Adjust Visual Effects and Background Activity

Windows and Mac both use visual effects like animations and transparency that look nice but consume processing power. On Windows, go to Settings > System > About, click Advanced System Settings, select the Advanced tab, and under Performance, click Settings. Choose "Adjust for Best Performance" to disable animations and visual effects. You'll lose some visual polish, but your computer will run faster.

On Mac, go to System Settings > Accessibility > Display and enable "Reduce motion" and "Increase contrast" to reduce the load on your graphics processor. You can also disable Spotlight indexing if you rarely use the search feature — go to System Settings > Siri & Spotlight and uncheck items you don't search for regularly. These changes are small individually but add up when combined with the other steps.

Frequently Asked Questions

How often should I restart my computer?

Restart at least once a week, or more often if you notice slowdowns. If your computer is on 24/7, restart it every few days. A weekly restart clears memory buildup and prevents the gradual slowdown that comes from running continuously.

Will deleting files from my Downloads folder hurt anything?

No. Your Downloads folder is meant to be temporary storage. Once you've installed a program or opened a file, the original read file is no longer needed. Deleting old downloads frees up space without affecting anything you're actively using.

Is it safe to disable startup programs?

Yes, for most programs. Disable anything you don't recognize or don't need running when your computer starts. If you disable something important by accident, you can always re-enable it later. Antivirus software and security tools should usually stay enabled at startup.

What's the difference between RAM and storage space?

RAM is temporary memory your computer uses while running programs — it clears when you restart. Storage is permanent space on your hard drive where files and programs live. You need both: low RAM makes programs slow, and a full hard drive makes everything slow.

Can I upgrade my laptop's RAM myself?

On most desktop computers, yes. On laptops, it depends on the model — some have RAM soldered to the motherboard and can't be upgraded. Check your laptop's manual or manufacturer website before attempting an upgrade. If you're unsure, a computer repair shop can do it for you.