Performance regression from 0.11.2 to 0.12.0

[hhorii]

Informations

• Qiskit Aer version: 0.12.0
• Python version: 3.9
• Operating system: MacOS

What is the current behavior?

Performance degradation due to #1717 is happened in 0.12.0.

#1717 provides pybind for AER::Config. This class will help simulation of circuits that use param_binds (such as in Primitive), but not for general circuits. AER::Config lists all items for configuration even though which are not used in a specified simulation method.

Steps to reproduce the problem

Run circuits with small qubits.

The above results were measured with following codes:

from time import time
from qiskit import QuantumCircuit, transpile
from qiskit_aer import AerSimulator
from qiskit.circuit.library import QuantumVolume

backend = AerSimulator(method='statevector')

print('num_qubits, iteration, elapsed')
for num_qubits in range(3, 15):
	circ = QuantumVolume(num_qubits)
	circ.measure_all()
	circ = transpile(circ, backend)
	
	start_ts = time()
	for j in range(100):
		ret = backend.run(circ).result()
	elapsed = time() - start_ts
	print(num_qubits, 100, elapsed)

What is the expected behavior?

No regression.

Suggested solutions

Not list all configuration items.