If a car takes some time to crank before it starts but starts what would be the culprit? I'm fairly…

If a car takes some time to crank before it starts but starts what would be the culprit? I'm fairly sure the fuel system is fine and the battery is good but I suspect it might be the spark plugs as we don't know how old they are (in a 2006 toyota with 256k milkes)

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