Understanding `Effect.suspend` in Effect Typescript Library

hi, i have a question regarding

Effect.suspend

Effect.suspend

, in docs it says, use this to lazily compute effect when doing heavy task. i did not quite understand this, what does

Effect.suspend

Effect.suspend

do internally? and what does it do differently if i do something like this,

yield* Effect.gen(function* () { return yield* someHeavyComputation() }

yield* Effect.gen(function* () { return yield* someHeavyComputation() }

yield* Effect.suspend(() => someHeavyComputation())

yield* Effect.suspend(() => someHeavyComputation())