Would you mind if I suggested that arbitrarily using a couple of gigabytes of memory like that was a fairly severe problem? :-)

Seriously, I would like to see a warning put on links to that example to the effect that at present it will make your browser use up to 2½ GB more RAM and will thrash your memory. Because it did render my browser (and to a lesser degree my system) unresponsive for a couple of minutes while things swapped.