Script causing unplayable lag, any help?

Im working on my game, and it has music regions. However, I got immense lag suddenly. I deleted this script and found out it was lagging me. I dont know why, or how it is causing unplayable lag, but music regions is a big part of a game. Does anyone know why or how this is happening? If so, thanks.

This is the code.

local plr = game.Players.LocalPlayer


local soundRegions = workspace:WaitForChild("SoundRegions")
soundRegions = soundRegions:GetChildren()

local soundManagement = {}

for _,region in pairs(soundRegions) do

	local info = {}

	local region3 = Region3.new(region.Position-(region.Size/2),region.Position+(region.Size/2))
	region.Transparency = 1

	info.Region = region3
	info.Sound = script.SoundRegions:FindFirstChild(region.name).Sound

	table.insert(soundManagement,info)

end

game:GetService("RunService").RenderStepped:Connect(function()

	for _,soundInfo in pairs(soundManagement) do

		local region = soundInfo.Region
		local sound = soundInfo.Sound
		local parts = workspace:FindPartsInRegion3WithWhiteList(region,plr.Character:GetDescendants())

		if #parts > 0 then

			if not sound.IsPlaying then

				sound:Play()
			end

		else

			sound:Stop()
		end
	end
end)

I don't know much about Region3 but the best you can do is make parts around the map and with sounds that play when you touch those parts.