Ok so before you even think about trying to speed rn the game you must first play the game and enjoy the game.
Playing the game and learning how the AI is. This is important if you learn how the AI works then you can beat (cheat) the game to your advantage.
Play through and learn this may take you a few attempts
There are many different speed run rules.
1. No gun speed run
2 sniper only speed run
3 pistol only speed run
4 no infinite ammo run
5 infinite ammo run
Now the time you see on mine 1h 40m is close to the record i saw which was 1h 35m i was using infinite ammo and all upgrades.
A normal run for me if not collecting anything is about 3h
Short cuts.
Now in resident evil village there is one short cut after you beat the castle. With the sniper. After you talk to Duke and head back into town.
You use the snuper to hit the lock that you would shoot off after going the long way round
