I tried it on firefox 31.6.0, under my regular profile, memory quickly climbs above 600mb and I have to kill it -- memory leaks are not impressive :)

Then I tried it under -safe-mode, and lo-and behold, no memory leak (~150mb) but it doesn't run

TypeError: asm.js type error: Disabled by javascript.options.asmjs in 
+about:config perl.js
TypeError: sessionStorage is null perl.js:34
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so i create a new profile and memory shoots up quickly again, but it doesn't start swapping, the memory isn't running away, its keeping steady under 200mb , firefox pups up a stop or continue runaway script perl.js, I can finally interact with firefox again, so I continue and I'm presented with it

preload time: 183740 ms
This is perl 5, version 18, subversion 1 (0x51c238) built for js...
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I run hello world, it runs

starting again and its the same deal all, no caching benefits nada -- sessionStorage is sessional :P  preload time: 148459 ms ... so thats about 2.5-3 minutes load time

Yeah