How to Fix a Slow Computer

Posted By: technowifi

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Restart Your Computer

This sounds too simple, but a restart fixes a surprising number of slowdowns. Background processes pile up over time, memory gets fragmented, and temporary files accumulate. Restarting clears all of that and gives your system a fresh state.

On Windows, click Start, then Power, then Restart (not Shut Down – Windows 10 and 11 use “Fast Startup” which doesn’t fully clear memory on shutdown). On Mac, click the Apple menu, then Restart. If you haven’t restarted in over a week, do it now before trying anything else.

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Close Programs You’re Not Using

Every open program consumes RAM and CPU time, even if it’s sitting in the background. Check what’s running and close what you don’t need.

Windows: Press Ctrl + Shift + Esc to open Task Manager. Click the “Processes” tab and sort by Memory or CPU usage. Right-click programs you’re not using and select “End Task.” Pay attention to web browsers – each tab uses its own chunk of RAM. Chrome with 30 open tabs can easily consume 4 GB or more.

Mac: Press Command + Space, type “Activity Monitor,” and open it. Click the CPU or Memory tab to see what’s using the most resources. Select a process you don’t need and click the X button to quit it.

Reduce Startup Programs

Too many programs launching at startup slow down your boot time and eat into available resources before you even start working.

Windows:

  1. Open Task Manager (Ctrl + Shift + Esc).
  2. Click the “Startup” tab (or “Startup apps” in Windows 11).
  3. Review each program. Disable anything you don’t need running at startup by right-clicking and selecting “Disable.”

Common culprits: Spotify, Discord, Skype, OneDrive, Adobe Creative Cloud, Steam, and manufacturer bloatware. Keep your antivirus and essential drivers enabled.

Mac:

  1. Go to System Settings, then General, then Login Items.
  2. Remove apps you don’t need starting automatically by selecting them and clicking the minus button.
  3. Also check “Allow in the Background” and disable items you don’t need running.

Free Up Storage Space

When your hard drive or SSD gets nearly full (90% or more), your computer slows down significantly. The system needs free space for virtual memory, temporary files, and OS operations.

Windows:

  1. Open Settings, then System, then Storage.
  2. Click “Temporary files” and delete everything listed (downloads, recycle bin, temporary files, Windows Update cleanup).
  3. Use “Storage Sense” to automatically clean up files on a schedule.
  4. Uninstall large programs you don’t use: Settings, then Apps, then Installed Apps, sort by size.

Mac:

  1. Click the Apple menu, then System Settings, then General, then Storage.
  2. Review recommendations like “Store in iCloud,” “Empty Trash Automatically,” and “Reduce Clutter.”
  3. Click through each category (Applications, Documents, Mail) to find large files you can remove.

Aim to keep at least 15 to 20 percent of your drive free. On a 256 GB drive, that means keeping 40 to 50 GB available.

Check for Malware

Malware, adware, and unwanted programs running in the background can slow a computer to a crawl. Signs include unexpected popups, new browser toolbars, unfamiliar programs in Task Manager, and high CPU usage when you’re not doing anything.

Windows: Run a full scan with Windows Security (built-in). Open Windows Security from the Start menu, click “Virus & threat protection,” then “Scan options,” select “Full scan,” and click “Scan now.” For a second opinion, download and run Malwarebytes (free version) – it catches things Windows Defender sometimes misses.

Mac: macOS has built-in malware protection (XProtect) that runs automatically. For a manual scan, Malwarebytes for Mac (free) is the most trusted option. Macs are less prone to malware than Windows PCs, but adware and browser hijackers still happen.

Update Your Operating System and Drivers

Outdated software can cause slowdowns, bugs, and security vulnerabilities. Updates often include performance improvements.

Windows: Go to Settings, then Windows Update, then “Check for updates.” Install all available updates, including optional ones. Restart when prompted. Also update your graphics driver from the manufacturer’s website (NVIDIA, AMD, or Intel) – outdated graphics drivers are a common cause of sluggish performance.

Mac: Go to System Settings, then General, then Software Update. Install any available macOS updates. App updates come through the App Store – open it and click “Updates.”

Add More RAM

If your computer has 4 GB of RAM or less, upgrading to 8 or 16 GB makes a dramatic difference. RAM is the single most impactful hardware upgrade for a slow computer.

Usage Recommended RAM
Web browsing, email, Office apps 8 GB
Photo editing, multitasking, light gaming 16 GB
Video editing, heavy multitasking, gaming 32 GB

Check how much RAM you have: on Windows, open Task Manager and click the “Performance” tab, then “Memory.” On Mac, click the Apple menu, then “About This Mac.”

Desktop PCs and many older laptops let you add RAM yourself ($20 to $60 for an 8 GB stick). Modern MacBooks, ultra-thin laptops, and some newer PCs have soldered RAM that can’t be upgraded – check your specific model before buying.

Switch From HDD to SSD

If your computer still uses a traditional spinning hard drive (HDD), replacing it with a solid-state drive (SSD) is the single best upgrade you can make. An SSD is 5 to 10 times faster than an HDD for boot times, file transfers, and program loading.

A 500 GB SATA SSD costs $30 to $50. Cloning your existing drive to the new SSD preserves all your files and programs – Macrium Reflect (free for personal use on Windows) handles the cloning process. On Mac, use Time Machine to back up, swap the drive, then restore.

Modern computers sold after 2017 typically come with SSDs already. If yours boots in over 30 seconds, you likely have an HDD and would benefit enormously from upgrading.

Disable Visual Effects (Windows)

Windows animations and visual effects use GPU and CPU resources. Disabling them makes the interface feel snappier, especially on older hardware.

  1. Press Windows + R, type “sysdm.cpl” and press Enter.
  2. Click the “Advanced” tab, then “Settings” under Performance.
  3. Select “Adjust for best performance” to disable all effects, or “Custom” to pick which ones to keep.
  4. Click Apply.

At minimum, keep “Smooth edges of screen fonts” checked – disabling that makes text look jagged and hard to read. Everything else is cosmetic and safe to turn off.

Why is my computer slow after a Windows update?

Windows often runs background tasks after an update – indexing files, installing components, and optimizing the system. Give it 30 to 60 minutes after the update completes. If it’s still slow after that, restart the computer. Check Task Manager for high disk or CPU usage from “Windows Modules Installer Worker” or “System” – these are post-update processes that finish on their own.

How old is too old for a computer?

For basic tasks (web browsing, email, documents), a computer from 2016 or later with an SSD and 8 GB RAM still works fine in 2026. For heavier work (video editing, gaming, development), hardware older than 4 to 5 years starts to show its age. If your computer is slow even after all the steps above, it may be time for a replacement rather than more upgrades.

Does clearing browser cache speed things up?

It can help if your browser feels sluggish or pages load slowly. In Chrome, press Ctrl + Shift + Delete (Command + Shift + Delete on Mac) and clear cached images, files, and cookies. This won’t dramatically speed up your whole computer, but it can fix browser-specific slowness and free up a few hundred megabytes to several gigabytes of storage.

See also: How to Improve Internet Connection, How to Connect HP Printer to WiFi, How to Reset Netgear Router

Sources

Microsoft – Improve PC Performance | Apple – Speed Up Your Mac