Research indicates that thinking fast makes you feel better:

Research in an entirely different field, music, has found that the tempo of background music played during a test can affect performance in tests of spatial ability. The faster the music, the better the mood of the participants, and the better they performed.

Emily Pronin and Daniel Wegner took a look at this and other evidence and began to wonder if the speed of thought itself could be what caused mood to improve. But how do you increase the speed of thought?

They devised a simple and elegant method: They simply asked volunteers to read words aloud as they scrolled onto a computer screen, one letter at a time. In the slow-thought condition, the words scrolled at a rate of about 6 letters per second. In the fast thought condition, the words scrolled at 20 letters per second. This compares to about 12 letters per second when people read aloud in a natural voice. After the test, the fast readers indicated that they felt they were thinking at a faster rate compared to the slow readers, and they indeed said they were generally in a better mood.