Faster Firing is the first upgrade on Path 2 for the Sniper Monkey. It costs $340 on Easy, $400 on Medium, $430 on Hard and $480 on Impoppable. It increases the attack speed of the Sniper Monkey, allowing him to fire exactly 1.4 times as fast. It is overall a relatively useful upgrade because non-upgraded Sniper Monkeys attack quite slow. This Sniper Monkey upgrade changes the DPS of the Sniper Monkey by about 40%, which may not seem like a huge difference, but it is.
In BTD6, this upgrade returns as Fast Firing. It also appears as the first upgrade of Path 3. It increases attack speed of the Sniper Monkey by ~54%. It costs $280 on Easy, $TBA on Medium, $TBA on Hard, and $TBA on Impoppable.
Appearance
Turns the green hat into a blue hat. No other changes occur.
In BTD6, it turns the green hat into a gray hat.
Gallery
BMC icon
BTD6 official artwork
Faster Firing upgrade icon in BTD5
Trivia
Combining this with Path 1 Upgrades can be really helpful for later rounds.
In BTD6, the blue hat that Faster Firing wore in BTD5 is now used for the Night Vision Goggles upgrade without additional crosspaths.