You are effectively setting buf to null, that is implicit in a let. node-text doesn't persistently hold a reference to the buf does it?
In a quick search, I see that StringBuilder will share the char[] with Strings from it's toString. I don't know if substring also shares, it may. Since you're releasing the reference to buf, it's not clear to me what (.setLength buf 0) will do, it's all available for GC anyway. You might want to open up the code for StringBuilder. If SB is sharing the char[] with the String from toString or substring, it's possible the char[] is much bigger than it needs to be. As you're appending to SB, it will grow the array speculatively, 2x I think, so it doesn't have to grow (and copy) with every append. If it then shares this array with the String, that String will hold onto an array 2x bigger than it needs. I've heard it recommend to create a new string out of the old one, so the old one can be GC'd even though this is an extra copy. I haven't researched this, but I hope this helps. -Mike
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