The Guild Wars 2 blog has been updated with a new post from Bill Freist, part of ArenaNet's QA department. Freist's job in the post is to talk about how the team is working to ensure a smooth, stable experience by implementing back end changes and optimizations to the game engine.
Guild Wars 2 engine programmers have made major client-side and back-end improvements over the past couple of months, including several different kinds of optimizations that have led to performance gains. Because we strive to ensure the smoothest player experience possible, we try to implement these changes only when they’ve been appropriately tested to ensure stability. This has led to the fluctuation in performance that many players have experienced through the Beta Weekend Events and stress tests.
Read the full post on the Guild Wars 2 site.