I try not to make too fast raise on the flop and not make too fast 3-bets. The standard time interval is 5-10 seconds before each decision. In online poker nobody cares if you take a few extra seconds.
I always click buttons very fast, usually use pre-action buttons. But if you watched any high limit tourneys, players there tend to take TB nearly every single time. Gosh. I try to make myself wait at least five seconds before clicking because some major mistakes were made in a rush or i've misclicked some fatal bets, but I'm failing desperately lol.
I'm pretty quick at making decisions, because I'm pretty good at poker math. Sometimes you have to think about remembering the actions of an opponent on the previous streets, especially when I play more than 4 tables at once
I usually make quick decisions. I don't see any point in tanking if you are grinding. Big decisions in big pots if you're playing up or in a big tourney, I get. But if you're playing your usual stakes and it's not a rare massive pot, it shouldn't take long.
I'm one of those players who is relatively quick with all my decisions, but when there is a tough decision at hand then I make sure I go over everything to make the best decision possible. Otherwise, I don't really pay attention much especially when I'm playing online, because I get distracted to often and it's for such low money that I can't concentrate. My decisions when playing live are much better and always more accurate.