Transferring 8KB of Data

I don't know about your hardware configuration, but there is a way to stream data from flash... take. look at this conversation about Best way to stream base64 encoded string to a web client. This is not the only conversation about how to handle large amounts of data. You find more, also in the way how to upload and save it right away in flash which also gives you more options of managing your resources. But as said, it depends on your hardware because not all of Espruino runs or is supported in some hardware. Best is to use an Espruino genuine board, because the Espruino firmware works there the best.