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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
It definitely seems like it's not using much - however it could have used up loads of memory while loading the webpage, failed, and then freed it - but if it had a problem allocating memory it normally would have said something.
Just checked and that page does return 4845 bytes, which should fit into the available memory you have just fine.
Maybe check that
on('data',...is actually getting called? It might be it can't make a connection, or I guess it's possible the connection is never getting closed?... but if it's never getting closed then you'd expect more memory to be used.