One's mind pays attention on something that it likes. So a good tip would be playing faster your irrelevant or boring moves and spending more time on critical positions (that tend to be the most interesting ones). Actually that's not a good tip, since you have to pay attention on every move, but it is practical, since we can't torture ourselves to pay attention in something that we don't want to.
Besides that, with more practice the visualisation skills improve and then you don't have to really pay a lot of attention all the time, you just know what to do and (most important) what not to do.
I read another day that a master think about bad moves as we think about illegal moves. We don't actually think about them. So the mind is really economic on that matter. So as long as you keep improving, you will not even think about the most obvious bad moves, so your attention can be on better and fewer moves.
Besides that, with more practice the visualisation skills improve and then you don't have to really pay a lot of attention all the time, you just know what to do and (most important) what not to do.
I read another day that a master think about bad moves as we think about illegal moves. We don't actually think about them. So the mind is really economic on that matter. So as long as you keep improving, you will not even think about the most obvious bad moves, so your attention can be on better and fewer moves.