Writing to Espruino WiFi EEPROM does not work anymore

Hi all,
I have a question, where I really got stuck: Since my code grows in size, I'm encountering more and more often that the serial output is stuck telling me calculating size... and does not move on any bit.
The whole console output is as follows:

save()
=undefined
Compacting Flash...
Calculating Size...

Does anyone know why it gets stuck there? My code is compacted the size of roughly 40kb. I'm compacting using the online closure compiler.
I have 4 precompiled functions using the Espruino compilation service.
Thanks for your reply. I'm currently using the latest travis build (lv96.35)