Ticks

Ticks are the standard unit of time in Minecraft, with one tick being equal to 50 milliseconds.

The physics engine runs at 20 ticks per second, meaning the game's physics are updated every 50 ms.

This includes the player’s position and speed, the environment, and entities.

In-game actions are performed at the end of each tick, regardless of the time or order in which they were called.

Due to the game working this way, inputs may take up to 50ms of delay, with the average delay being 25ms. This phenomenon is known as tickrate delay.