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As tested in https://github.com/Mbed-TLS/mbedtls/issues/6790, after introducing side-channel counter-measures to bignum, the performance of RSA decryption in correlation to the MBEDTLS_ECP_WINDOW_SIZE has changed. The default value of 2 has been chosen as it provides best or close-to-best results for tests on Cortex-M4 and Intel i7. Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>