Ladder Settings Seperation

I’m sure I’m wrong but I accidentally set my speed to casual and then I went to play multiplayer and the game was still in casual which made me realize… there is 3 totally separate ladders for people playing on the different speeds… Obviously I’m miss understanding the actually way this works right everyone is on the same ladder right? I’m not sitting in que for 4 minutes because my game is only aloud to match with 1/3 of the community right?

Everybody in matchmaking plays on normal speed (1.7x)