I should have gotten back earlier, but you published 1.26.12.3 in the meantime.
I still have the feeling of the glibc version being slightly slower on rezzing a scene than the jemalloc version (is it something I'm imagining, or is there a difference?) but on the plus side is that it definitively seems less memory consuming.
I was at a quite crowded place on Sunday (using the latest 1.26.12.3), and typically that has earlier equalled to hitting the memory roof (and finally crash) but not this time, everything was working flawlessly.
To me that says that the current glibc version is at least equal in stability. It will be interesting to hear others views on it.
Keep up the good work Henri, you know we complain if it doesn't work