To those having issues with the keyboard, it is an experimental keyboard by xda-developers (check the settings under text input and you'll see about 40 more options than android gives you). The lag has been noted.
However in the release notes I have a link for an update.zip that will take you back to the stock keyboard. So if you don't need any of the options that come along with that keyboard then just grab that zip and flash back to stock.
