Try disabling the discrete GPU -- does that help?

@Abhishek0511 its because of the latest BIOS update 1.29 and 1.30 for this system.

the main thread is here:

https://www.dell.com/community/en/conversations/inspiron/g15-5520-lag-and-stutter-after-updating-to-bios-1290/6762c01afdfadd2667ab728a?page=1

@ejn63​ no it didnt ,i am not using my my laptop for any intense tasks so gpu is not an issue for me

@shoob​ ok but when will there be a new update, i am too annoyed because of the issue 

@Abhishek0511​ no idea man it has been 1+ months now

@shoob​ yaa isnt there any solution on that

@Abhishek0511​ nope, we cant downgrade the BIOS as DELL has blocked downgrade for "security reasons". So we are just a sitting duck with our ovens until a new updates roll out. New update should be soon ig cuz its Feb already

yes i first thought the windows update is causing the issue then when i reinstalled the windows the issue continued and now upon a deeper inspection i have come to know that its this shi**y update