Ah.. weird I have no idea then. I've got an Eclipse running on Win7 SSD that has been open for over a month using 3GB of ram out of 16GB. It's very very snappy. I do have an Eclipse running on a macbook pro SSD 16GB and that one has about a 2-3 sec freeze when swapping back to Eclipse after backgrounding it for awhile, so I thought that was your issue. Maybe Win 8.1 works more similarly to OSX than Win 7?