hello, i have my Lenovo laptop about 2 years now when i started playing fortnite i more fps when i started first and i played everything on medium but after 2 months i started feeling something the game started to lag i never looked on my fps before but when i fellt something i tick it on and saw that my fps is droping like from 70- to 20 -30 and even it goes up to 90 -100 sometimes and come down back to 50-40 i have my drivers of my Nvidia Geforce 920mx up to date and my cpu is intel i5 6200U@2.30 2.40 i never reach 2.40 tho but i dont know whats the problem that causing me to drop plz i need help