If it still scrolls choppily on performance mode, then you're right, it probably has to do with the P8 Lite's hardware and/or firmware. I don't have them in front of me, but I've certainly seen choppy scrolling on some of my older devices. For example, my Honor 5X is pretty bad when it comes to smooth scrolling or animations. Considering that it's also a budget/midrange Huawei phone like yours, it seems like a relatively close comparison.