There are some server instabilities. Cause unknown.
If you experience terrible lag, please log out to avoid the risk of getting banned(mainly applicable to farmers/people doing dojo).
There are a few things you can try to do, to see if the lag will stop:
Disconnect yourself from your router and do the following:
Open command prompt
Type in: ipconfig /flushdns
Hit enter
Type in: netsh winsock reset
Hit enter
Restart your pc and connect to the router again.
There is no guarantee that it will help, but it has fixed past lag for me.
Updates will follow as soon as possible.
Sorry for the inconvenience.