Text field typing lag

[ckhrysze]

There is a noticeable amount of delay between typing and text appearing in the text field. The code is still pretty simple:

defmodule Mudex.Scene.Home do
  use Scenic.Scene
  require Logger

  alias Scenic.Graph
  alias Scenic.ViewPort

  import Scenic.Primitives
  import Scenic.Components

  @text_size 18
  @graph Graph.build(font_size: @text_size)

  # ============================================================================
  # setup

  # --------------------------------------------------------
  def init(_, opts) do
    # get the width and height of the viewport. This is to demonstrate creating
    # a transparent full-screen rectangle to catch user input
    {:ok, %ViewPort.Status{size: {width, height}}} = ViewPort.info(opts[:viewport])

    graph =
      @graph
      |> text("Hello Scenic!", fill: :white, translate: {5, 15})
      |> text_field("",
        id: :input,
        width: width - 10,
        translate: {5, height - 40}
      )

    {:ok, graph, push: graph}
  end

  def handle_input(event, _context, state) do
    Logger.info("Received event: #{inspect(event)}")
    {:noreply, state}
  end
end

I'm running this on an HP Pavilion laptop running Ubuntu 18.04. I'm happy to provide any additional information. I also took a quick video trying to demonstrate what I'm seeing, if there is a reasonable place to put that.

[Eiji7]

I have added your code to example project generated using: mix scenic.new.example example and I did not noticed any special lag between input and draw. Since it's hard to reproduce it we need to find a different way to fix your problem. Did you tried same code on any other PC?

[ckhrysze]

I tried, but attempting the basic scenic.new project on my Macbook led to the other issue I just filed. The only only computer I have access to is windows...I started down the path of using Ubuntu bash shell on windows; I will continue that when I get a chance.

[boydm]

Hey guys. Just want you to know that I see this, but am traveling right now and won't get a chance to really look at it for a bit...

[Eiji7]

@ckhrysze

The only only computer I have access to is windows

This should not be a problem. Just use any live CD/USB Linux distribution … In second USB drive you can save some test projects.

I tried, but attempting the basic scenic.new project on my Macbook led to the other issue I just filed.

Unfortunately I can't help here as I don't have any PC from Apple. Unlike official Linux live CD/USB releases I don't believe that Hackintosh tests would be proper at all.

I started down the path of using Ubuntu bash shell on windows

Oh, WSL is a big mystery for me - I never tried it. It's like wine project - it would probably never be a complete solution. Also I don't think that "laggy" Windows would run Linux software faster than Linux. I would have no other choice then I prefer to run virtual machine instead.

By "laggy" I mean that all versions I tried (from XP, Vista, 7, 8, 8.1, 10) every time I tried to click on "My computer" right after inserting any CD/DVD disc I got explorer window freeze. If they can't fix so simple thing in so many years then it's just not OS I could even consider for daily use. Such important part of software in 21th century without any multithreading is not even a bad joke for me. For sure if I need to replace such important OS parts with 3rd-party apps then I prefer to simply install any Linux distribution with package manager.