perf: optimize mapped, add benches

benchmarks/propagate.bench.luau

@@ -0,0 +1,63 @@
+local ReplicatedStorage = game:GetService("ReplicatedStorage")
+
+local Charm = require(ReplicatedStorage.Packages.Charm)
+
+local atom = Charm.atom
+local computed = Charm.computed
+local effect = Charm.effect
+local listen = Charm.listen
+
+local function propagate(w: number, h: number)
+	local src = atom(1)
+	for _ = 1, w do
+		local last = src
+		for _ = 1, h do
+			local prev = last
+			last = computed(function()
+				return prev() + 1
+			end)
+		end
+		effect(function()
+			last()
+		end)
+	end
+	src(src() + 1)
+end
+
+local function propagateListen(w: number, h: number)
+	local src = atom(1)
+	for _ = 1, w do
+		local last = src
+		for _ = 1, h do
+			local prev = last
+			last = computed(function()
+				return prev() + 1
+			end)
+		end
+		listen(last, function() end)
+	end
+	src(src() + 1)
+end
+
+return {
+	Functions = {
+		["effect 1*100"] = function()
+			propagate(1, 100)
+		end,
+		["effect 100*1"] = function()
+			propagate(100, 1)
+		end,
+		["effect 10*10"] = function()
+			propagate(10, 10)
+		end,
+		["listen 1*100"] = function()
+			propagateListen(1, 100)
+		end,
+		["listen 100*1"] = function()
+			propagateListen(100, 1)
+		end,
+		["listen 10*10"] = function()
+			propagateListen(10, 10)
+		end,
+	},
+}