by lagging i meant to say that it could be pure qml-like app,fluent ,greasy or lets say more responsive.By lagging i mean ,it takes a little bit time to render the page from top to bottom ,scroll works ok but still i think it needs a little bit tweaking,Then i would suggest that there should be two big options on the sides to turn to next page or the previous one. Double click idea is great but i think the options to turn to next page are quite tiny there and also what if we want to read something with keyboard closed ?So probably there should be big arrows to point out a direction to next page or to previous one. sorry my english sucks .But i hope you understand.