Restart your computer regularly
Close unused programs and browser tabs
Uninstall apps you do not use
Disable unnecessary startup programs
Free up disk space
Delete temporary files
Keep your operating system updated
Update your drivers
Run a malware scan
Use an SSD instead of an HDD
Add more RAM
Reduce visual effects
Check for overheating
Clean dust from fans and vents
Use a lightweight browser
Limit background apps and sync tools
Defragment an HDD if you use one
Keep your desktop and downloads folder organized
Scan for and remove bloatware
Reinstall the operating system if needed