This question was asked before in the forum but received no replies, I too wish to post the same question.
Am also trying to reduce AVERAGE speed from 1.0 to 0.75 but am not sure in which xmb file to look for and after having scanned through the files I do not see anything that seems to relate to overall game speed.
Is this one of the hard coded modding no-no's? Would be a shame if it is.
[This message has been edited by Zalehov9 (edited 11-15-2021 @ 02:13 PM).]