I am a casual piano player and use the Simply Piano app (which is amazing btw, way beyond my expectations) and I do hate playing slow. Lately I try to play any

I am a casual piano player and use the Simply Piano app (which is amazing btw, way beyond my expectations) and I do hate playing slow. Lately I try to play any piece at first sight at the original tempo, even though I make many mistakes, I started doing this for more complex songs/pieces and I realized that my sight-reading improved by a lot and that when I go back to easier songs I can play them without any mistake in the first try. I am not saying this is the way to go if you want to become a great classical pianist, but for the casual player that just wants to learn fast to be able to play some songs, I find that trying to force your brain into quickly recognizing patterns and quickly making the correct movements works pretty well.