local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")

local WindowFocusReleasedFunction = function()
    RunService:Set3dRenderingEnabled(false)
    setfpscap(1000)
    return
end

local WindowFocusedFunction = function()
    RunService:Set3dRenderingEnabled(true)
    setfpscap(1000)
    return
end

local Initialize = function()
    UserInputService.WindowFocusReleased:Connect(WindowFocusReleasedFunction)
    UserInputService.WindowFocused:Connect(WindowFocusedFunction)
    return
end
Initialize()