This item is not replicated across Roblox’s server/client boundary.
This property can only be read from. Attempting to write to it will cause an error.
The HeartbeatTimeMs property is a a measurement of the total amount of time it takes long it takes for Roblox to update all of its Task Scheduler jobs, in milliseconds. If this value is high, then it means one of the tasks are hogging up a lot of resources.