qiskit/releasenotes/notes/1.0/vf2-threading-b778a36de5b88...

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The :class:`.VF2Layout` and :class:`.VF2PostLayout` transpiler passes previously would
potentially run their internal scoring using multithreading if the input
circuits were sufficiently large. However, the multithreading usage has
been removed from the passes as it was shown to cause a performance
regression instead of an improvement like originally intended.