from nedmalloc website:
"nedmalloc is a VERY fast, VERY scalable, multithreaded memory allocator with little memory fragmentation...
It is more than 125 times faster than the standard Win32 memory allocator, 4-10 times faster than the standard FreeBSD memory allocator and up to twice as fast as ptmalloc2, the standard Linux memory allocator. It can sustain a minimum of between 7.3m and 8.2m malloc & free pair operations per second on a 3400 (2.20Ghz) AMD Athlon64 machine"
I've made some changes to allow compilation in gcc (4.3) for Windows using code::blocks
You can download zip file here.