We're currently updating the server core to increase resilience when lot of players are connected (7k each day for a week now).
This is a major performance upgrade, that can cause the server to restart for maximum hour from now.
You should notice a lag/delay reduction, especially tonight during server population peak, if everything is working.
During our stress tests, we experienced a variable delay reduction, from 20% to 70%.
EDIT 14:10: The update is now live, and the crash source has been identified and fixed. The realm is stable now.