maybe you are just running out of memory. you should enable the heap indicator, in window > preferences > general, check show heap status. an indicator appears in the bottom right corner of the window.

if it looks like most of the memory is used and that the garbage collector is running all the time, increase the memory limit for the vm (-xmx parameter, there are different ways to do it depending on your install and your os). we recommend to set this limit to at least 1g, to be on the safe side.

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