Does caffeine actually help your game, or does it just make you impatient?

[uptrendfinancialsignal]

I was just pouring my third cup of coffee and I paused thinking. Does caffeine even help or it just makes a person jittery? I feel very sharp for the first one hour I take it, then I start rushing to making decisions with no patience.
That could be a grave mistake. What's your take on this?