I am not looking for platitudes, but for real time saving practical ideas. The best would be time savings of 50% or more for things like food prep, kitchen cleaning, cooking, you get the idea.
Where possible, buy things that are already chopped up.
I'm very slow at such prep work, so it helps me a ton to buy things like those little jars of minced garlic, bags of frozen chopped onions, meat that's already chopped up, cans of chopped chilies, etc.
It can save a great deal of time!