Roblox Item is lagging - lua

Question

I add a mesh to follow the player where ever he goes. But the mesh is lagging a bit when the player runs. I understand that it is not rendering quickly enough, but anyone know how to add a mesh without it lagging?
local humanoidRootPart = character:WaitForChild('HumanoidRootPart')
local backpackItemWorkspace = game.ReplicatedStorage.Meshes[pet.Name]:Clone()
backpackItemWorkspace.Parent = game.Workspace.CurrentPets
RunService.Stepped:Connect(function()
local location = humanoidRootPart.CFrame
backpackItemWorkspace.CFrame = location * CFrame.new(2, 2, 3)
end)

Answer 1

Connect the mesh and rootpart using a weld, so you dont need to use RunService to move the mesh everytime.
local humanoidRootPart = character:WaitForChild('HumanoidRootPart')
local backpackItemWorkspace = game.ReplicatedStorage.Meshes[pet.Name]:Clone()
backpackItemWorkspace.Parent = game.Workspace.CurrentPets
function attach(hroot, mesh)
local weld = Instance.new("WeldConstraint", mesh)
local location = hroot.CFrame
mesh.CFrame = location + Vector3.new(2, 2, 3)
weld.Part0 = hroot
weld.Part1 = mesh
return weld
end
attach(humanoidRootPart, backpackItemWorkspace)
-- please comment if it makes any errors

Answer 2

Ok, for others struggling with having a pet(mesh) follow you smoothly and always stay on your back. I have now spent several hours on this subject and finally got it to work. This is how you do it:
local character = player.Character
local humanoidRootPart = character:WaitForChild('HumanoidRootPart')
//where you copy you pet from
local backpackItemWorkspace = game.ReplicatedStorage.Meshes[pet.Name]:Clone()
//where you keep your pets in the workspace
backpackItemWorkspace.Parent = game.Workspace.CurrentPets
//call the function for attaching the pet
attachPet(backpackItemWorkspace, character, humanoidRootPart)
function attachPet (pet, char, humanoidRootPart)
local focusPart = humanoidRootPart
local newPet = pet
local z = -5
local x = 1
local bodyPos = Instance.new("BodyPosition")
bodyPos.Parent = newPet
bodyPos.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
local bodyGyro = Instance.new("BodyGyro")
bodyGyro.Parent = newPet
bodyGyro.MaxTorque = Vector3.new(math.huge, math.huge, math.huge)
while wait() do
bodyPos.Position = focusPart.Position + focusPart.CFrame.LookVector * z + focusPart.CFrame.RightVector * x
bodyGyro.CFrame = focusPart.CFrame
end
end
Also when you unequip a pet you have to Destroy it from where you store it. In my case I store them in a folder on the player which I call collectionInventory.
local collectionInventory = player:WaitForChild("CollectionInventory")
collectionInventory[petName]:Destroy()
Hope this save anybody else from wasting several hours with research. Even though you will probably learn a lot from those "wasted hours" ;)