local function render_bottlenecks(event)
    local colors = {
        {r=0,g=1,b=0},  -- defines.entity_status.working
        {r=1,g=0,b=0},  -- defines.entity_status.no_power
        {r=1,g=0,b=0},  -- defines.entity_status.no_fuel
        {r=1,g=0,b=0},  -- defines.entity_status.no_recipe
        {r=1,g=0,b=0},  -- defines.entity_status.no_input_fluid
        {r=1,g=1,b=0},  -- defines.entity_status.no_research_in_progress
        {r=1,g=0,b=0},  -- defines.entity_status.no_minable_resources
        {r=1,g=0,b=0},  -- defines.entity_status.low_input_fluid
        {r=1,g=0,b=0},  -- defines.entity_status.low_power
        {r=1,g=0,b=0},  -- defines.entity_status.disabled_by_control_behavior
        {r=1,g=0,b=0},  -- defines.entity_status.disabled_by_script
        {r=1,g=0,b=0},  -- defines.entity_status.fluid_ingredient_shortage
        {r=1,g=1,b=0},  -- defines.entity_status.fluid_production_overload
        {r=1,g=0,b=0},  -- defines.entity_status.item_ingredient_shortage
        {r=1,g=1,b=0},  -- defines.entity_status.item_production_overload
        {r=1,g=0,b=0},  -- defines.entity_status.marked_for_deconstruction
        {r=1,g=0,b=0},  -- defines.entity_status.missing_required_fluid
        {r=1,g=0,b=0},  -- defines.entity_status.missing_science_packs
        {r=1,g=0,b=0},  -- defines.entity_status.waiting_for_source_items
        {r=1,g=0,b=0},  -- defines.entity_status.waiting_for_space_in_destination
        {r=1,g=0,b=0}   -- defines.entity_status.waiting_to_launch_rocket
    };

    for _,player in pairs(game.players) do
        local surface = player.surface;
        local player_pos = player.position;
        local res = player.display_resolution;
        local zoom = 0.3;
        local s = {x=res.width/zoom/64, y=res.height/zoom/64};
        local view_top_left = {x=player_pos.x-s.x, y=player_pos.y-s.y};
        local view_bottom_right = {x=player_pos.x+s.x, y=player_pos.y+s.y};
        local visible_entities = surface.find_entities_filtered{area = {view_top_left, view_bottom_right}, type={"furnace", "assembling-machine"}};
        for _, e in pairs(visible_entities) do
            local color = colors[e.status]
            rendering.draw_rectangle{players={player},surface=surface,color=color,filled="true",left_top=e,left_top_offset={-0.2,-0.2}, right_bottom=e,right_bottom_offset={0.2,0.2},time_to_live=61};
        end
    end
end

script.on_nth_tick(60, render_bottlenecks);