What is the most efficient way to handle events in this case?

[Anaminus]

That rule currently applies only to RemoteEvents, not events in general.

As for performance, listeners will reuse threads when they can:

Sound.MaxVolume

Events have a secret optimization: A thread is reused as long as the listener doesn’t yield. Observe how this switches to a new thread only every 100 iterations. local i = 0 game:GetService("RunService").Heartbeat:connect(function() i = i + 1 print(i, coroutine.running()) if i%100 == 0 then wait() end end)