The issue with Eurex is that the installations are configured by the member (you or me) so this allows a large margin for error because there are many many variables to configure and lots of ways of getting the installation wrong/not best practices.
In short, your Eurex performance depends...
Most if not all installations in London have been upgraded and I believe the big bang (when Eurex allow you to actually use this extra bandwidth is in December 06 :)