Feldon 
A growing number of players on the Splitpaw, Valor, and Storms servers (located in Amsterdam and serving the UK and English-speaking Europe) have been reporting unplayable gameplay lag and connection delays. Some players are reporting no problems while others are experiencing 5-6 second cast delays. Further confusing matters, there seems to be no geographic pattern to the problems, as some living in close proximity to Amsterdam are reporting the biggest problems while those far away are getting fast responses.
UPDATE: We’ve updated this article to address the Valor and Storms servers.
In the absence of further information, this would suggest a Routing problem of some sort from the Amsterdam data center.
More information as we have it…
There was a pretty big routing problem nationwide in the UK earlier today caused by some router failures at Level 3 which probably won’t be helping matters. http://twitter.com/#!/level3
See also http://www.zdnet.co.uk/blogs/mapping-babel-10017967/juniper-fail-seen-as-culprit-in-site-outages-10024743/
“Several reports of core dumps by Juniper Networks routers have lead to suspicions that a BGP update bug is behind site outages across the world.”
http://forums.station.sony.com/eq2/posts/list.m?start=30&topic_id=508935
“The lag is occurring outside of our servers and is evidenced by the fact that a great deal of players have no issue at all. Our service providing is there but the path to our servers is having issues that is outside of our direct control. That is the extent of the information I can provide on the situation.”