Certain skills like Shield Bash or Cyclone usually need their respective weapon type held in order cast. If you have the required weapon equipped but not held, you'll automatically switch weapons and then cast it, effectively adding additional cast time. This will eat up even more time if you want to switch back to the weapon you were using previously.

Using Pcasting however, you can ignore the weapon swap animation altogether and cast it with your currently held weapon. To do this, all you have to do is cast any other skill, then cast the second skill during the endlag of the first. You'll cast the skill while the required weapon is still in your pocket, saving time and making combat much more fluid.
As far as I'm aware, this only works in singleplayer or as the host of a lobby. More testing needs to be done to see if this is FPS dependent or not.




Pcasting can be particularly useful for Bandits, as 4 of their skills require either melee weapons or ranged weapons. Keep in mind however, Pcasting will only trigger the hitbox of the skill, skills like Pay Day wont lunge forwards if Pcasted, so you'll have to be right next to enemies for them to be effective.

As far as I know, this works with all skills that require specific weapon types.
At the time of writing, this includes: Blood Gush, Lethal Strike, Shield Bash, Cyclone, Execute, Killer Jab, Pay Day, Venom Shot, Volley, and Spread Shot.