get fps and ping in roblox

local RunService = game:GetService("RunService")
    local FpsLabel = script.Parent

    local TimeFunction = RunService:IsRunning() and time or os.clock

    local LastIteration, Start
    local FrameUpdateTable = {}

    local function HeartbeatUpdate()
        LastIteration = TimeFunction()
        for Index = #FrameUpdateTable, 1, -1 do
            FrameUpdateTable[Index + 1] = FrameUpdateTable[Index] >= LastIteration - 1 and FrameUpdateTable[Index] or nil
        end

        FrameUpdateTable[1] = LastIteration
    local fps = tostring(math.floor(TimeFunction() - Start >= 1 and #FrameUpdateTable or #FrameUpdateTable / (TimeFunction() - Start)))
    script.Parent.Text = "FPS = "..fps.."    Ping = "..game:GetService("Stats").Network.ServerStatsItem["Data Ping"]:GetValue()
    end

    Start = TimeFunction()
    RunService.Heartbeat:Connect(HeartbeatUpdate)