Sometimes poker players feel rushed to make a decision, but if you look at the most successful grinders they take as much time as they need. Sure, online they give you scant seconds to make a hard call and this can cost you because you may be ahead and how do you know if you don't take the time to run through the hand.
Never feel like you can't take the time to act. It is costly otherwise. IF you are online and you need more time then don't play so many tables at once. Play as many as you can handle if two or so had really important decisions at the same time. You need to be able to make the right call and that will mean replaying the hand over and over. Take the time!