So, I've got a game in the pipeline.

Game environment screenshot

There's a problem, tho. After a couple of weeks of lunch hours incrementally adding stuff, it's regularly using up 100% of my CPU and slowing down. I don't really know how to go about debugging what part of the application is using all those resources.

I've particularly noticed that if you restart the map, (by pressing r or falling in water) a few times, the resource issue gets much worse.

Possible issues:

It's loading quite a lot of assets in /js/loader.js

The collision method on the platforms group (interaction.landOnPlatform) is being called many times a second. Although that steps over most functionality when 3 flags are false.

  landOnPlatform: function (player, platform) {
    if (platform.breakable) {
      interaction.breakPlatform(player, platform);
    if (player.slamming) {
      player.slamming = false;
    if (player.jumping) {
      if (player.body.onFloor()) {
        player.jumping = false;
      } else if (player.body.onCeiling()) {

There's also quite a lot of objects being created by map.draw (reading a file from /maps/

Because of the repeated reloading exacerbating the issue, could it be that this block in map.draw is not removing all the objects and their interactions from memory?

  platforms.clear(true, true);
  doors.clear(true, true);
  water.clear(true, true);
  keys.clear(true, true);
  springs.clear(true, true);
  sliders.clear(true, true);
  slider_tracks.clear(true, true);

The full code base is here:


I'm really looking for advice on how to find this issue, or more information on exactly what and where the issue is.

Please be kind, I'm a ruby developer playing in JavaScript, so this isn't my first language.

  • 2
    \$\begingroup\$ Have you tried profiling it? You can use Chrome dev tools for that. \$\endgroup\$ May 30, 2019 at 12:01
  • \$\begingroup\$ @Pritilender I wasn’t aware of it, but sounds like it could be really helpful here. Thanks! \$\endgroup\$
    – AJFaraday
    May 30, 2019 at 12:33
  • \$\begingroup\$ I haven't yet solved this problem, but I did find this discussion of Phaser 3 performance. Saving for future investigation: html5gamedevs.com/topic/… \$\endgroup\$
    – AJFaraday
    May 31, 2019 at 8:18


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