This update, even on systems not running modded-FIRM apparently, caused a slowdown in certain cases in some game(s). For example, with Sheikah Stones in "The Legend of Zelda: Ocarina of Time 3D", there's noticeable audio issues.
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This was caused by the NATIVE_FIRM ARM11-kernel changes: when running v11.2 NATIVE_FIRM with v11.3-nandimage(with the required patches to get NATIVE_FIRM to run with v11.3-nandimage), this new issue doesn't occur.