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An isolate in V8 is essentially a sandboxed environment where JavaScript code runs independently. It includes its own memory heap, execution context, and garbage collection. Isolates provide a way to run multiple instances of JavaScript code concurrently without interfering with each other’s state or memory.

CPU Time

Each time a worker run, it’ll spend time to execute operation, it’s called CPU Time.

Wall Time

It’s the whole time since the begining of the worker.