General Tips :

• Always be moving. Don't just interact with something, move towards it first, then click on it.
• Try using items in your inventory from the right to the left so it won't be shambled for your next click.
• Try combining objects in your inventory while moving.
• Moving your mouse to make appear the "ignore" button on the opening is worth doing.

Chapter 1 :

• You don't need the old cloth from the kitchen, nor the thinner, and don't need to scrub the painting to open the Lynx's mouth

Chapter 2 :

• Lot of dialogues, you can exit the first one with the nun directly.
• Don't need to talk to the gardener till he's in the front door area. Then, toolbox and only two dialogues, "About this place" then "Aberdeen". No need for more.
• Priest's answer are 1, 2 and 3.

Chapter 3 :

• From the start, you have to jump off the coffin directly. If you're still on a black screen while knocking, reset. Not sure about the method, spamming 4 times might work.
• After you got the key and violin, leave from the front door and go to the sewers. Way faster, don't need AT ALL to go to the library/mausoleum.
• The Fog is RNG. So, if you want to best it, you'll have to hope that all 4 are really close from where you enter.

Chapter 4 :

• Beware, just after getting the blue map, if you go to quickly to Alexander, he won't scream and won't go to the basement.
• You don't need the crystal from the angel, nor do you need to watch the sky to open the locker. Still need the window to open (maybe).
• Going in every room to fast travel is a key in this one.
• You don't need to go to the kitchen once you opened the garden, way faster.