Restart the laptop
Close unnecessary apps and browser tabs
Disable startup programs
Free up disk space
Uninstall unused software
Run a malware scan
Update the operating system
Update drivers
Check for background processes using high CPU or memory
Clean temporary files
Defragment a hard drive if using HDD
Upgrade from HDD to SSD
Add more RAM
Reduce visual effects
Check for overheating and clean vents
Use the laptop on a hard surface
Replace an old battery if performance drops on battery power
Reset or reinstall the operating system if needed