It's not that bad, since this is the web, the game runs as soon as the geometry is loaded, textures are loaded on the file like images in a web page, so you don

It's not that bad, since this is the web, the game runs as soon as the geometry is loaded, textures are loaded on the file like images in a web page, so you don't have to wait (a hologram texture is shown for missing textures that haven't loaded yet). About 10-30 seconds to start depending on bandwidth, and once started, the resources are cached by the browser until they expire.