qiskit/releasenotes/notes/0.20/rust-denselayout-bc0f08874a...

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---
features:
- |
The :class:`~.DenseLayout` transpiler pass is now multithreaded, which
greatly improves the runtime performance of the pass. By default, it will
use the number of logical CPUs on your local system, but you can control
the number of threads used by the pass by setting the
``RAYON_NUM_THREADS`` environment variable to an integer value. For
example, setting ``RAYON_NUM_THREADS=4`` will run the
:class:`~.DenseLayout` pass with 4 threads.