Restart the laptop
Close unnecessary apps and browser tabs
Open Task Manager or Activity Monitor
Sort processes by CPU usage
Sort processes by memory usage
End unneeded high-usage processes
Uninstall unused programs
Disable startup apps
Disable background apps you do not need
Scan for malware or viruses
Update the operating system
Update device drivers
Update the browser
Clear browser cache
Reduce browser extensions
Check for Windows Update or system update loops
Check for runaway cloud sync apps
Pause or limit backup software
Check for overheating and clean vents
Use the laptop on a hard surface
Clean dust from fans and vents
Run a full memory diagnostic
Check for failing RAM
Check disk usage for 100% activity
Replace a failing HDD with an SSD
Free up storage space
Increase virtual memory or swap
Reduce visual effects
Set power mode to Balanced
Reset or reinstall the problematic app
Perform a clean boot
Create a new user profile
Reinstall the operating system if needed
Upgrade RAM if the laptop supports it
Replace the battery if power throttling is occurring