I have Dell Latitude 7490 with i7-8650U and UHD 620. When i am working, The performance is best and the laptop runs fast but as soon as i plug it in for charging the whole system slows down and gets laggy, i tried all the method for power option and set them to max performance.. still it lags i had even changed the power setting from BIOS but still it lags does any body have the solution for it ?