Restart the PC
Close unnecessary background apps
Disable startup programs
Uninstall unused software
Delete temporary files
Empty the recycle bin
Run a full antivirus scan
Update Windows or your operating system
Update device drivers
Check for malware and adware
Free up disk space
Defragment a hard drive if using HDD
Optimize SSD only if recommended by the OS
Increase virtual memory if needed
Check for overheating and clean dust from fans
Verify RAM health
Replace failing hard drive with SSD
Add more RAM if system memory is low
Reduce browser tabs and extensions
Reset or reinstall the operating system if necessary