This is always something we're trying to improve. There are many optimizations we still have to do on the engine.
I must say though, 5 gig is a bit on the large side!Try updating your Java if you haven't already done so.
Yea, I see it grow overtime. It starts at like 800mb and then keeps growing untill it freezes. I'll check if my java is up to date.
edit: Just updated my JRE to the latest version, still same problem
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