I have an Acer Aspire V15 Nitro with 16GB of RAM, an i7-4720hq at 2.6Ghz, and a Geforce 960m with 4GB of vRAM running a 4k windows 8.1 environment. I am experiencing lag in the oddest places: the lock screen when I click and the picture slides up to allow me to type in my password, and when I...