tbh i hate speedruns like that where your not really playing the game fast your just glitching straight to the end. like that pokemon yellow speedrun that glitches the game so hard you beat it in 0 seconds.Using something called zips to load bosses invisibly
if you do it optimally you can kill elden beast by loading into one of the later fights in the game and just running far enough away. The game will treat it as elden beast dying and teleport you to the end of the game. It’s hard because the zips are frame perfect but before this you could average around 7-9 minutes depending on how good you were at zips