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# Release 0.16 (2010-08-17)
This release has the following improvements:
- The Nix expression evaluator is now much faster in most cases:
typically, [3 to 8 times compared to the old
implementation](http://www.mail-archive.com/nix-dev@cs.uu.nl/msg04113.html).
It also uses less memory. It no longer depends on the ATerm library.
- Support for configurable parallelism inside builders. Build scripts
have always had the ability to perform multiple build actions in
parallel (for instance, by running `make -j
2`), but this was not desirable because the number of actions to be
performed in parallel was not configurable. Nix now has an option
`--cores
N` as well as a configuration setting `build-cores =
N` that causes the environment variable `NIX_BUILD_CORES` to be set
to *N* when the builder is invoked. The builder can use this at its
discretion to perform a parallel build, e.g., by calling `make -j
N`. In Nixpkgs, this can be enabled on a per-package basis by
setting the derivation attribute `enableParallelBuilding` to `true`.
- `nix-store -q` now supports XML output through the `--xml` flag.
- Several bug fixes.
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