According to a comment[1] I read, it&#x27;s being worked on but jemalloc 3 still isn&#x27;t enabled by default.  I guess it could improve performance for some things, but I think less fragmentation would be the only major win for overall footprint.<p>[1] <a href="http:&#x2F;&#x2F;www.phoronix.com&#x2F;forums&#x2F;forum&#x2F;software&#x2F;programming-compilers&#x2F;820702-jemalloc-4-0-brings-space-speed-optimizations" rel="nofollow">http:&#x2F;&#x2F;www.phoronix.com&#x2F;forums&#x2F;forum&#x2F;software&#x2F;programming-co...</a>