OK so i see a lot of posts mostly disappointments, you need to know this new data center and routing around it won't be perfect on day 1. we had the same issues with EU Data center move as well ( used to be in Canada too ), and the first week or so was Horrible we had routing issues, and it was mostly from the ISP sides and their connections ( namely orange ).

for those not familiar with the internet and and how it works, it's like a huge spiderweb with inter-connections and bottlenecks and such. the new servers are probably creating unusual or new traffic in some of the connections or hubs, so i think the ISPs need to help SE as well, it's not all on SE. I think with time, it will get better for the rest.