From the README:
zimalloc
zimalloc is general purpose allocator for Zig, inspired by mimalloc.
Status
This project is under development and should currently be considered experimental/exploratory; there
is no documentation and it has not been battle-tested. In particular there may be issues with
multi-threaded workloads. Contributions of any kind (PRs, suggestions for improvements, resources or
ideas related to benchmarking or testing) are welcome.
The allocator is significantly faster than std.heap.GeneralPurposeAllocator(.{}) but should not
(yet) be expected to be competitive with other established general purpose allocators.