5.15 chat and champion select bugs

I've got some issues with the new patch: sometimes the champion select page freeze and the game don't load, that mean that I need to force restart lol. Another problem is with the chat, is really slow and every time I can't read others message in champion select page and in the normal chat, not in game. Another one is that the game load slow from the queue to the champion select. That mean that I can't choose a lane every time. What can I do? I use Mac. (Sry for my bad eng)