You need to do a factory reset. No lag here with 3040x1440. I factory reset after every 2nd update as you always should do. Or even just delete the catch partition in recovery
Yes it does. Your seeing things. Your making issues that are not there. Qhd runs as smooth as 1080. Qhd is acually the correct screen res for the device
It will be mate exactly the same phone with exactly the same beta build. Many problems like that are fixed with a factory reset. If 1 person is suffering lag so would all of us as we are all on the same beta build. If 1 person is suffering lag and the rest of us are not time for them to do a factory reset. Bet they have never done a factory reset since they started beta hence why some people get issues like that. I always do a factory reset first to see if the problem goes before I report it. As standard you do a factory reset first if you encounter a issue. If it's still the same after a factory reset there is a problem with the rom. We would all have the same issue if it's a rom problem.
