runService.HeartBeat slowing down part movement script?

Hello I am making a script that allows the player to manipulate position and rotation of a part, I have this working fine how ever, when using a heartbeat event my fps / lag will get progressively worse the longer I am manipulating the part. At about the 3000th iteration it becomes really noticeable. Any suggestions or solutions would be appreciated. this script I've dumbed down can be copy / pasted straight into a local script inside the player to test.

-- variables
local uis = game:GetService("UserInputService")
local cam = game.Workspace.CurrentCamera
local runService = game:GetService("RunService")
local connection = nil
local part = Instance.new("Part")
part.Parent = workspace
local alignPos
local alignRot
local attch

-- returns mouse location in 3d space
local function getMouse()
    local x = uis:GetMouseLocation().X
    local y = uis:GetMouseLocation().Y
    print(1)
    local camRay = cam:ViewportPointToRay(x, y, 1)
    return camRay
end

-- part manipulation function
local function followMouse(target, alignPos)
    connection = runService.Heartbeat:Connect(function()
        local camRay = getMouse()
        alignPos.Position = (camRay.Origin + camRay.Direction * 10)
    end)
end

-- verifying input, part, and mouse ray validity
uis.InputBegan:Connect(function(input)
    if input.UserInputType ~= Enum.UserInputType.MouseButton1 then return end
    local camRay = getMouse()
    local rayParams = RaycastParams.new()
    rayParams.FilterDescendantsInstances = {game.Players.LocalPlayer.Character}
    rayParams.FilterType = Enum.RaycastFilterType.Blacklist
    local rayCast = workspace:Raycast(camRay.Origin, camRay.Direction * 1000)
    if not rayCast then return end
    local target = rayCast.Instance
    if (target.Position - game.Players.LocalPlayer.Character.HumanoidRootPart.Position).magnitude > 15 then return end
    -- constraint creation
    alignPos = Instance.new("AlignPosition")
    attch = Instance.new("Attachment")
    alignRot = Instance.new("AlignOrientation")
    alignRot.Parent = target
    alignRot.Mode = Enum.OrientationAlignmentMode.OneAttachment
    alignRot.Attachment0 = attch
    alignPos.Parent = target
    attch.Parent = target
    alignPos.Attachment0 = attch
    alignPos.Mode = Enum.PositionAlignmentMode.OneAttachment
    -- calling part manipulation function
    followMouse(target, alignPos, alignRot)
end)

-- disconnects and destroys heartBeat and constraints
uis.InputEnded:Connect(function(input)
    if input.UserInputType ~= Enum.UserInputType.MouseButton1 then return end
    if not connection then return end
    connection:Disconnect()
    alignPos:Destroy()
    alignRot:Destroy()
    attch:Destroy()
    connection = nil
end)