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In #12955 optimization was switched to O2 because with the '-Os' option, the ESP32 hangs sporadically in 'tests/bench*' if interrupts where disabled too early by benchmark tests. Since it hasn't been reproduced since and in #13196 O2 was causing un-explained hardfaults, since the aforementioned issue could not be reproduced we switch back to Os by removing O2, as Os will be used by default.