1. not sure about the shout thing, no one else has reported issues, I will test it out but I don't actually think this is an issue
2. I have no idea what the lag in wild has to do with shouts
3. lag in wild is due to the fact chunks are being created when players explore. there are a lot of chunks being created at one time, and the server can only go so fast. the shrines aren't causing lag, players are.