How to write efficient code?

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ECS is basically functional programming with a shared mutable state.
Nothing mystical. Just tables indexed by entities and pure logic functions acting on them.

Example ECS-ish pattern:

local Players = game:GetService("Players")

local Component_Health:{[Player]:number}={}


local function PlayerAdded(Plr:Player):()
	Component_Health[Plr]=100
	Plr.CharacterAdded:Connect(function(char):()
		local humanoid = char:WaitForChild("Humanoid") :: Humanoid
		Component_Health[Plr]=humanoid.Health
	end)
end

Players.PlayerRemoving:Connect(function(plr):()
	Component_Health[plr]=nil
end)

Players.PlayerAdded:Connect(PlayerAdded)
for i,v in Players:GetPlayers() do PlayerAdded(v) end

Efficient code = code that ONLY does what it needs to do.
No ambiguity. No wrapper circus. No “professional-looking” abstraction slop.

Just:

  • predictable
  • linear
  • optimized logic
  • as few layers as possible between your idea and the bytecode

Don’t drown yourself in unnecessary frameworks. Don’t use React-tier nonsense. Write what you understand, and optimize as you go. Your goal is clean bytecode, not “my architecture looks senior-qualified.”

If you want to understand efficiency, you MUST understand what your Luau turns into. Here’s my bytecode tutorial:

Also: avoid the “single script architecture” and avoid fragmentation for no reason. Luau has no linker - don’t spam ModuleScripts unless they serve a clear purpose.

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