Laptop lag or slowdown when charging on Windows is common, often due to Power Plan Settings customization.Methods to fix laptop lag while charging include ensuring the device isn't overheating and using a good power adapter.Changing Power Settings and Processor Power Management Settings can also resolve lag issues.Running a full antivirus scan and freeing up RAM and CPU resources are recommended steps to address slowdown problems.If issues persist, consulting a technician or using the laptop when not charging are suggested.Optimizing power plans and cleaning the heat sink can prevent overheating and improve performance while charging.Using an original power adapter and avoiding third-party ones can help prevent overheating issues.Changing Power Mode settings to Better Performance or Best Performance can enhance laptop charging performance.Tweaking Processor Power Management settings can prevent processor overheating and resolve lag problems.Running a full antivirus scan and ending unnecessary tasks in Task Manager can boost system performance.