A slow computer is one of the most frustrating everyday technology problems. Before spending money on a new machine or a repair service, try these ten steps. Most of them are free, take under ten minutes each, and can dramatically improve performance on both Windows and Mac computers.
1. Restart Your Computer
This sounds too simple, but many people leave their computers running for weeks or months without a restart. A restart clears the RAM, stops unnecessary background processes, and installs pending updates. If your computer has not been restarted recently, do that first before anything else.
2. Check What Is Using Your Resources
On Windows, press Ctrl + Shift + Esc to open Task Manager and click the CPU or Memory column to sort by usage. On Mac, open Activity Monitor from Applications > Utilities. Identify any process using an unusually high percentage of CPU or memory. If it is a programme you do not recognise, search its name online before closing it.
3. Uninstall Programmes You Do Not Use
On Windows, go to Settings > Apps > Installed Apps and sort by size. Remove anything you no longer use. On Mac, drag unused applications from the Applications folder to the Trash. Fewer installed programmes means fewer background processes and less disk space consumed.
4. Disable Startup Programmes
Many programmes add themselves to your startup list so they launch automatically when you turn on your computer. On Windows, open Task Manager, go to the Startup tab, and disable anything non-essential. On Mac, go to System Settings > General > Login Items. Reducing startup programmes cuts boot time and frees resources immediately.
5. Clear Browser Cache and Extensions
A bloated browser is a common source of sluggishness, especially if your browser is slow while the rest of the system feels fine. Clear your browser’s cache and cookies in the settings menu. Disable or remove browser extensions you do not actively use — each one consumes memory.
6. Free Up Disk Space
When your drive is nearly full, performance degrades significantly. Aim to keep at least 10 to 15 percent of your drive free. On Windows, use Storage Sense in Settings > System > Storage. On Mac, go to Apple menu > About This Mac > Storage > Manage. Delete old downloads, empty the Recycle Bin or Trash, and move large files to external storage or cloud.
7. Check for Malware
Malware running in the background can consume significant system resources. Run a scan using Windows Defender (built into Windows 10 and 11) or Malwarebytes (free version available for Mac and Windows). Remove anything flagged.
8. Update Your Operating System and Drivers
Pending updates often include performance improvements and bug fixes. On Windows, go to Settings > Windows Update. On Mac, go to System Settings > General > Software Update. Also update your graphics drivers, which can improve performance noticeably on older machines.
9. Adjust Visual Effects
Animations and visual effects look nice but consume resources. On Windows, search for “Adjust the appearance and performance of Windows” and select “Adjust for best performance.” On Mac, reduce motion under System Settings > Accessibility > Motion. This makes a meaningful difference on older or lower-spec machines.
10. Consider Adding RAM or an SSD
If software steps do not provide enough improvement, a hardware upgrade may be the answer. Upgrading from a traditional hard drive to an SSD is the single most impactful upgrade you can make to an older computer — boot times and application loading speeds improve dramatically. Adding RAM is the second most impactful change if your machine frequently runs out of memory. Both upgrades are relatively inexpensive and can extend a computer’s useful life by several years.
Final Thoughts
Work through these steps in order and you will likely resolve most performance issues before reaching the hardware upgrade stage. For other digital skills guides, explore our digital skills section.
Frequently Asked Questions About PC Optimisation
Why does my computer get slower over time?
Computers slow down due to accumulated software, startup programmes, browser extensions, fragmented storage, and outdated drivers. Each installed programme can add background processes. Regular maintenance — removing unused software, clearing caches, and managing startup items — prevents most slowdowns.
Does adding more RAM actually speed up a computer?
Yes, if RAM is the bottleneck. If your computer has 4GB or 8GB RAM and struggles with multiple open programmes, upgrading to 16GB can dramatically improve performance. If the CPU or storage (HDD vs SSD) is the bottleneck, more RAM will not help.
Is upgrading from HDD to SSD worth it?
Upgrading from a hard disk drive (HDD) to a solid-state drive (SSD) is often the single most impactful upgrade for an older computer. SSDs are 5–10x faster for read/write speeds, resulting in dramatically faster boot times and application loading.
Should I use a PC cleaning software?
Use with caution. Reputable tools like CCleaner (free version) can safely remove temporary files. However, many ‘PC cleaner’ or ‘registry cleaner’ programmes are either unnecessary or potentially harmful. Windows’ built-in Disk Cleanup and Task Manager are usually sufficient for most users.
When should I consider replacing my computer instead of optimising it?
If your computer is more than 7–8 years old, has less than 4GB RAM with no upgrade path, runs a discontinued OS, or repairs would cost more than 50% of a new machine’s price, replacement is usually the more economical long-term choice.
Final Thoughts
Mastering PC Optimisation can genuinely transform how you work and live. The tools and techniques covered in this guide are designed to be practical and actionable — you don’t need to be a tech expert to benefit from them.
Regular computer maintenance takes less than 30 minutes per month but can extend your machine’s useful life by years, saving you significant money on replacements.
Start small, be consistent, and you’ll be surprised how quickly these skills become second nature. Share this guide with someone who could benefit, and feel free to bookmark it for future reference.
Sources & Further Reading
- Microsoft Support. (2024). Tips to improve PC performance in Windows. support.microsoft.com
- PCWorld. (2024). How to speed up your PC. pcworld.com
- Linus Tech Tips. (2024). SSD vs HDD — full comparison. linustechtips.com
- Which?. (2024). How to speed up a slow laptop. which.co.uk
