Almost all of Real Madrid's players have speed, and a slow playing style actually makes them more not effective.
You're right, but Madrid's style focused on being a little slower thanks to Ancelotti, where they basically made good use of the midfield but now football is very fast, if you compare it to Barcelona's football you have to be fast and the forwards have to help defend, and generally Madrid's forwards don't do it, Vinicius doesn't help and that's negative, for me if he doesn't collaborate he shouldn't come on, Xabi has the same idea, so Xabi is building a totally integrated team without egos.
Of course, forwards helping the defense is a big problem for Real Madrid, for example. You don't experience this at Barcelona. Barcelona forward Lewandowski often helps the defense and is tall enough to clear the ball from the defense. Sometimes, a ball coming off the defense can even create a goal-scoring opportunity for Barcelona. That's why Barcelona has a very good system. Real Madrid has good fans.