It's not just me. I get complaints from multiple people. There is a noticeable difference when the Kronos shows up. Again, this noticeable difference started when changes were made to the giant monsters. Before that, the lag was not a significant issue.
I'm trying to run a very large event and keep it manageable. It is a long and exhausting night. It is a LOT of people, teams, leagues, Babbages, complaints, special requests, demands to deal with. I have posted how I run the event in the forums, on discord, and repeatedly in chat during the event.
My feeling is that any "rules" I make are arbitrary. I am not a GM and have no authority to enforce them. SNS has been successful and fun for years because of the cooperation of the player base. Every week I ask people to bring their patience and a fun attitude... and for the most part, people do. Until recently.