fps drop when unfoccused

local UserInputService = game:GetService("UserInputService") --not created off of start up
local RunService = game:FindService("RunService") --created on start up

local function render(state)
    RunService:Set3dRenderingEnabled(state)
end

local function Initialize()
    UserInputService.WindowFocusReleased:Connect(function() --I personally perfer this unless you need to refer to the function more then once
        render(false)
        setfpscap(10)
    end)

    UserInputService.WindowFocused:Connect(function()
        render(true)
        setfpscap(360)
    end)
end
Initialize()