Fast Shot

Fast Shot is a Fallout, Fallout 2, Fallout Tactics, and Fallout: New Vegas trait.

J.E. Sawyer's Fallout RPG
During the charge phase, you can fire a firearm instead of charging (eliminates you from the action phase of that round), but your critical hits with firearms always come in 6 point increments.

Fallout: New Vegas
This trait reduces accuracy with Energy Weapons and Guns by 20% while increasing the fire rate by 20%. This reduction in accuracy reduces the chance to hit when firing in VATS and increases the amount of sway when taking zoomed shots out of VATS.

Funnily enough, this trait is best suited to players who like sniping. For example, the Anti-Materiel Rifle has a spread of 0.03. With Fast Shot, this would increase to 0.036, a negligible difference, while the increased speed helps compensate for the rifle's low rate of fire. Conversely, automatic weapons, with their high base spread, suffer the most from this trait. Players who prefer to "run and gun" may want to consider Trigger Discipline instead.

This trait works extremely well with other AP reduction perks like Math Wrath. For some weapons, the AP cost of weapons is reduced significantly to the point of allowing many more shots in VATS. An example of this is with the All-American, which has an AP cost of 13. When using the All-American with Fast Shot and the perk Math Wrath, the AP cost becomes 9.36, which can allow some characters 10+ shots in VATs. The extra shots in VATs also makes the perk Concentrated Fire more appealing.

One factor to consider is that, while there are a number of perks that can increase accuracy in VATS (Gunslinger, Commando, Sniper etc), Fast Shot is the only perk/trait that increases your firing rate. Note that this trait will reduce your maximum accuracy in VATS to 76% (not the case on PC). This can be negated by the Gunslinger, Commando, or Sniper perks.