I've always priotized the success and enjoyment that the roleplay offers as a whole over the individual preferences of each player. I wouldn't be able to let individuals that take weeks to post hold back an entire group. But then it's just like it's been mentioned, it depends on the group and the players. Sometimes you're just not compatible with others. But if you're not compatible with others, I think it's less selfish to just jump ship, or force yourself along. It's better in the long run, otherwise you are just a detriment to the entire game.