Why Do Tweened Bricks Sometimes Lag?

Hello. I have some automatic doors and other tweened objects such as an elevator that typically work smoothly. The game is relativly small however, about 25% of a time when I join a new server, all of the Tweened bricks/models lag resulting in choppy animations. Why is this and how can I fix this? The code works 75% of the time and I believe it might be a problem on Roblox's side.

open = false
door1 = script.Parent.Parent.RightDoor.Door
door2 = script.Parent.Parent.LeftDoor.Door

local thud = 183859526
local hydraulicLoop = 1842956861
		local sound = Instance.new("Sound")
		sound.Parent = script.Parent
		sound.MaxDistance = 70
		sound.PlaybackSpeed = 0.9
		
local TweenService = game:GetService("TweenService")
local part = script.Parent

local tweenInfo = TweenInfo.new(2,Enum.EasingStyle.Linear,Enum.EasingDirection.Out,0,false,0)

local Door1Open = {CFrame = door1.CFrame + door1.CFrame.lookVector * -3.5}
local Door2Open = {CFrame = door2.CFrame + door2.CFrame.rightVector * -3.5}
local Door1Close = {CFrame = door1.CFrame}
local Door2Close = {CFrame = door2.CFrame}

local Open1 = TweenService:Create(door1,tweenInfo,Door1Open)
local Open2 = TweenService:Create(door2,tweenInfo,Door2Open)
local Close1 = TweenService:Create(door1,tweenInfo,Door1Close)
local Close2 = TweenService:Create(door2,tweenInfo,Door2Close)

script.Parent.Touched:connect(function()
	if open == false then
		sound.SoundId = "http://www.roblox.com/asset/?id="..hydraulicLoop
		Open1:Play()
		Open2:Play()
		open = true
		sound:Play()
			wait(5)
		sound:Play()
		Close1:Play()
		Close2:Play()
		open = false
	end
end)