When I type into group or private chat windows in the PvP.net client, it only shows/updated the characters I've typed once a second. It feels a bit like the framerate is really slow, since the yellow pulsing bar under my summoner name is cycling very slowly.
This was after I had tried to create a match but couldn't, (see the firewall error message thread).
I shutdown PvP.net and restarted it, and when I came back the typing and bar pulsing were back to normal speed. I was able to play a match and when I returned to PvP.net the typing and pulsing were still good. Maybe just a weird case where you leave or can't connect to a game.
Thought I'd report it anyhow...