Thank you for your message. Do you observe the keyboard lag with all the keys or certain keys like a s w d?
Does it happen with any application in particular, like the MS Office suite, browsers?
Open Command prompt & check if the lag issue is seen with the internal keyboard.
For my reference, please click on the message tab next to your avatar– click “New Message” & search for my Dell username (Sreejith R) & send a private message with the service tag, registered name & email address.