Most slow computers have one of a few problems: too many programs starting with Windows, not enough memory for how you work, a nearly full drive, or an old spinning hard drive. Checking Task Manager tells you which. Upgrading an old hard drive to an SSD is often the single biggest improvement.
Common causes
Too many startup programs
Apps that launch with Windows slow down startup and use memory all day.
Not enough memory (RAM)
Modern browsers, Teams, and Office together can use more than 8 GB, forcing the computer to slow down.
Old hard drive
Computers with spinning hard drives instead of SSDs are dramatically slower to start and open files.
Drive almost full
When the main drive has little free space, Windows and updates slow down.
Malware or unwanted software
Adware, toolbars, and malware use resources in the background.
How to fix it, step by step
- 1
Check Task Manager
Press Ctrl+Shift+Esc and look at CPU, Memory, and Disk. Whatever is near 100% is your bottleneck.
- 2
Disable unneeded startup apps
In Task Manager's Startup tab, disable programs you don't need to start automatically.
- 3
Free up disk space
Use Storage Sense or Disk Cleanup, and remove programs you no longer use.
- 4
Restart regularly
Restart at least weekly so updates install and memory is cleared.
- 5
Scan for malware
Run a full scan with Microsoft Defender or your business antivirus.
- 6
Consider an SSD or memory upgrade
If the computer has a hard drive or 8 GB of RAM or less, an upgrade may cost much less than a new computer.
When to call a technician
We'll tell you honestly whether an upgrade will make the computer fast again or whether it's time to replace it — and handle either one without losing your files.
On-site support across Orange County · see our IT support, managed IT, Microsoft 365 support and cybersecurity services.
Frequently asked questions
How much RAM does an office computer need?
16 GB is a comfortable standard for office work with Teams, Outlook, and many browser tabs. 8 GB works for lighter use.
Is it worth upgrading an old computer to an SSD?
Often, yes. An SSD can make an older computer start and open programs several times faster, as long as the rest of the computer is still supported.
When should a business replace a computer?
Typically every four to six years, or sooner if it can't run a supported version of Windows or upgrades won't fix the slowness.