How can I prevent my computer from slowing down?

1. Run regular virus and malware scans

2. Clean up temporary files
3. Uninstall unnecessary programs
4. Disable startup applications or services
5. Adjust your visual effects
6. Reduce the number of programs running at start-up
7. Defragment your hard drive
8. Add more RAM
9. Disable browser extensions
10. Upgrade your OS when available