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I originally implemented jemalloc as the memory allocator in the upstream Core back in 2020 as a result of problems with memory fragmentation. In the end, it was traced to a memory leak caused by the use of compression in the p2p middleware.
Since I fixed that memory leak, and the entire p2p middleware was subsequently replaced in Core 3.x, there is no major need for jemalloc anymore, so we no longer ship it.