Even in single-player sessions, there is a server running on the device that is calculating the ticks.
If you are experiencing low TPS (ticks per second) in your Minecraft world constantly and want to upgrade your computer, upgrading your CPU will make the game run better as opposed to the GPU.
#### Things in the game that are controlled by game ticks: - WIP # Redstone Ticks ### How redstone is calculated As opposed to game ticks, there are only 10 redstone ticks in a second. This makes each redstone tick last 100 milliseconds. In each redstone tick, there are two game ticks. Since Redstone ticks are run alongside game ticks, having less than 20 game ticks per second will slow down the speed of Redstone. On the other hand, if it takes a long time to process redstone for redstone ticks it can slow the game ticks down and lag your game. # Random Ticks # Half ticks (C-Tick & P-Tick) ### Consumer and Producer ticks In Bedrock edition each Redstone tick contains two Game ticks. However, unlike Java edition, the tick in the first and second half of the Redstone tick behave differently and serve different functions. The first half-tick in the Redstone tick is the Consumer tick (C-tick) and the second half is the Producer tick (P-tick). Outside of redstone components, both of these ticks function/serve the same purpose and have no difference. ### C-tick and Consumers C-ticks are the tick in the first half of the redstone tick. C-ticks affect only consumers (A list of all consumers is below). The C-tick travels and functions just like a normal redstone signal. However, C-ticks are limited to a single line of redstone dust as any method of extending the signal will require a producer, which can not be activated by a C-tick. C-ticks only function within the simulation distance of the world. Consumers are defined by any redstone-related block that can interact with redstone but have no method of outputting a redstone signal (The exception is the target block see below). It is usually better to think of Consumers as any block that is not a Producer block. Or, Any block that can not output a redstone signal. Consumer block can either redirect or ignore redstone dust.A block will never be both a Consumer and a Producer. Even if the block can take a redstone input such as a repeater, it will always be a Producer and only take a P-tick as input.