I use codecombat on a wide variety of low end computers due to my job. Some can barely run it (our very very low end Chromebooks), and others do better (my cheap laptop) I have noticed that from time to time when I am loading levels, or worse, when I change heroes while in a level, the available items don’t always load their icons. They are still selectable, the icons just don’t show up.
This example is from the cheap laptop, which is:
Windows 8.1 (It burns!)
i5-3337u @ 1.8 GHz
64 bit system
Onboard terrible Intel HD Graphics 4000 adapter