Computer is Running Very Slow (Windows)
Last updated 14 June 2026
Is your Windows PC feeling sluggish? Programs taking forever to open? This guide will walk you through the most effective steps to speed up your computer.
Symptoms
Programs take a long time to open
Frequent freezing or lag, especially after startup
High disk or CPU usage in Task Manager
Step-by-Step Resolution
1. Restart Your PC
Click Start > Power > Restart. After restart, wait 2-3 minutes before opening apps. This clears temporary files and refreshes system processes.
2. Check What's Using Resources
Right-click the taskbar and select Task Manager
On the Processes tab, sort by CPU and then Memory
If a program you recognize is constantly at the top and you're not using it, right-click it and choose End task
3. Remove Startup Programs
In Task Manager, go to the Startup apps tab
Disable anything you don't need starting automatically (for example: Teams, Spotify, Adobe Updater)
Restart your PC to apply changes
4. Free Up Disk Space
Go to Settings > System > Storage
Turn on Storage Sense if available
Click Temporary files, select Downloads (if safe), Recycle Bin, and previous Windows installations
Click Remove files
5. Run a Malware Scan
Open Windows Security from the Start menu
Click Virus & threat protection > Quick scan
If anything is found, follow the removal prompts and restart
6. Update Windows and Drivers
Go to Settings > Windows Update and install all important updates
For display and network drivers, open Device Manager, right-click the device > Update driver > Search automatically
Still experiencing issues? If your PC remains slow after these steps, it may need hardware upgrades (SSD/RAM) or deeper cleanup. Our team at My IT Butler can help optimise your system with a remote session.
Still need help?
Lodge a ticket and I'll get back to you, or open the chat for a quick question.