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Quake-like game made with JavaScript takes up just 13KB of storage
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
Instead of actually storing images, sound files, maps, etc, whole program relies on algorithms computed at runtime. Level generated automatically, sound follows a set math pattern with randomization, etc etc
Benefits of less file size but more processor requirements
Oh yeah. I can remember back in the day it could take quite a bit to compile and start these things, especially if you were running at higher resolution and detail values.