How much memory do you have?
Any virus scanner running?
I'm using the same configuration 16GB without any such problem.
I am on Windows 7 2GB. I have tried temporarily turning off my antivirus and it helps but does not eliminate the problem. I shut down as many services as I could and it helped more but the problem is still there. I am showing less than 50% memory utilization in that configuration so I do not believe it is memory starvation from an OS perspective, although it could be that the program limits how much memory it is asking for.
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I was in you situation. You just don't have a enough memory. From my experience at least 4 GB is required
I went through the optimizations on http://bexhuff.com/2012/09/jdeveloper-memory-and-performance including setting the look and feel to Windows and setting the memory so my PC is using 85-90% of the available memory and am getting much better performance. This should allow me to continue until I can get some more memory.