As I noted on MAGNOLIA-1998, the 3.6 version has a much better memory behavior and also performs much better (up to 8 times faster).
The relevant changes were done by solving MAGNOLIA-2099 (memory) and Magnolia-2086 (performance)
What I try now to do is to merge the memory related changes to the 3.5 branch so that a potential 3.5.5 could provide similar memory improvements.
But the performance enhancements will be part of 3.6 only I do also expect that we can't reach the same memory behavior in 3.5 as for 3.6
So I'm quite happy with the improvements ;-)