Now unplayable on the Steam Deck because some geniuses at Capcom thought adding DRM made by the world's most incompetent coders to a 11 year old game was something they needed to do.

Capcom is adding a Mod blocking DRM that is also known to cause performance issues to this (a 10 year old game) and to other of their games. This is stomach-turning behaviour and no one should reward nor tolerate this.