qiskit/releasenotes/notes/0.23/clifford-compose-performanc...

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---
features:
- |
:class:`.Clifford` now takes an optional ``copy`` keyword argument in its
constructor. If set to ``False``, then a :class:`.StabilizerTable` provided
as input will not be copied, but will be used directly. This can have
performance benefits, if the data in the table will never be mutated by any
other means.
- |
The performance of :meth:`.Clifford.compose` has been greatly improved for
all numbers of qubits. For operators of 20 qubits, the speedup is on the
order of 100 times.