How to run a remote event at the same time for everyone?

So I'm trying to fire a remote event for all clients at the same time ( so every client runs it at the same time locally ). How would you do this regardless of lag, I understand you need to add a timeout in case someone is lagging too much.

Hello, tantec! It is easy. Just use the RemoteEvent:FireAllClients() function. Unlike FireClients(), it doesn't require a player instance. The FireAllClients() function should fire a RemoteEvent at the same time for everyone. Here's an example:

Server:

script.Parent.Touched:Connect(function(hit)
	if hit.Parent:FindFirstChildOfClass("Humanoid") then
		game:GetService("ReplicatedStorage").TouchGuiEvent:FireAllClient()
	end
end)

Client:

game:GetService("ReplicatedStorage").TouchGuiEvent.OnClientEvent:Connect(function()
	script.Parent.TextLabel.Text = "A humanoid has touched a part!"
end)

If this helped you please accept this answer.