These details may be useful, I’ll try to specify every little detail about the issue that I can remember:
Summary of my laptop’s specs: ASUS TUF FX505GE, i7–8750, GTX 1050Ti 4GB, 8GB RAM, SSD+HDD, Windows 10 Home Edition SL
The laptop is still relatively new, just bought around 1 month ago but the issue started since around last week. At first, there was no issue at all.
The lagging issue occurred whenever I unplugged my laptop from the charger, 1–2 seconds after Windows automatically switch the power plan to Power Saver mode. Suddenly, the cursor apparently disappears. When