Context Switching
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
When the CPU switches from one task to another, it must save the current task's state and load the new task's state. This process has overhead (time, computational power). Scaffolding role: The hidden cost of multitasking. Don't assume that 'doing two things at once' is efficient. Frequent switching causes the brain to expend a large amount of energy on 'saving/loading' rather than on the task itself. Maintaining long periods of single-threaded work (flow) is the only solution to reduce switching overhead.
SCAFFOLDING EFFECT
Reduce cognitive load
The hidden cost of multitasking. Don't assume that 'doing two things at once' is efficient. Frequent switching causes the brain to expend a large amount of energy on 'saving/loading' rather than on the task itself. Maintaining long periods of single-threaded work (flow) is the only solution to reduce switching overhead.
Anchor fast decisions
Task switching requires 'saving the scene—loading the scene', and this overhead does not produce value but inevitably occurs. When switching frequency is high, the overhead proportion approaches or even exceeds effective working time (analogy: loading/unloading time exceeds driving time). The same applies to the human brain: each switch requires reloading goals, constraints, and intermediate states, and it takes time to regain focus. Therefore, 'parallel' is actually 'fast serial + high loss'.
MINIMUM ACTION
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Source support: Explicit
- zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E4%B8%8A%E4%B8%8B%E6%96%87%E4%BA%A4%E6%8F%9Bverified
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