qiskit/releasenotes/notes/0.19/retworkx-substitute_node_wi...

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---
features:
- |
Various transpilation internals now use new features in `retworkx
<https://github.com/Qiskit/retworkx>`__ 0.10 when operating on the internal
circuit representation. This can often result in speedups in calls to
:obj:`~.compiler.transpile` of around 10-40%, with greater effects at higher
optimization levels. See `#6302
<https://github.com/Qiskit/qiskit-terra/pull/6302>`__ for more details.