Before fixing it, it helps to know why computers slow down. The usual culprits are: too many programs starting automatically when you turn on your computer, a nearly full hard drive, malware running in the background, an outdated operating system, or simply not enough RAM for what you're trying to do. We'll tackle each one.
This sounds obvious, but many people just close the lid or put it to sleep. A full restart clears the memory and closes background processes. On Windows, click Start › Power › Restart. On Mac, click the Apple menu › Restart. Wait for it to fully start up before testing speed.
Windows: Right-click the taskbar at the bottom, choose Task Manager, then click the Startup tab. Right-click anything you don't need and select Disable. Mac: Go to System Settings › General › Login Items and remove anything unnecessary.
When your hard drive is more than 85% full, your computer slows down significantly. Windows: Open File Explorer, right-click your C: drive, and select Properties › Disk Cleanup. Mac: Click the Apple menu › System Settings › General › Storage to see what's taking up space and remove it.
Malware running in the background is a major cause of slowdowns. Windows: Open Windows Security from the Start menu and run a Quick Scan. It's built in and free. Mac: Malwarebytes for Mac has a free version that's excellent for one-time scans.
Browser extensions are a hidden cause of slowdowns. Open your browser's extensions or add-ons page and remove anything you don't actively use. Also clear your browser's cache: in Chrome, go to Settings › Privacy and Security › Clear browsing data.
Windows: Go to Settings › Windows Update and install anything available. Mac: Go to System Settings › General › Software Update. Updates often include performance improvements and security patches that can dramatically speed things up.
If you've tried all of these and your computer is still slow, the issue might be hardware. A computer older than 6–7 years with less than 8GB of RAM will struggle with modern software. Upgrading to an SSD (solid-state drive) is the single most effective hardware upgrade for a slow computer — it can make an old machine feel brand new. If your computer is very old, it may simply be time for a new one.
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