Earlier today Bill Freist, a member of the Quality Assurance (QA) department, provided a nice writeup regarding the optimization process for Guild Wars 2 (he even provided pictures!). Many players may have noticed that the game has been running smoother during the stress tests, to which he says:
At present, Guild Wars 2 has already received a massive amount of optimizations. This means that players who have suffered from poor performance in the past should see an improvement to their frame rate. But there are still discrepancies between individual systems. As we investigate those, it leads us to discover interesting bottlenecks. For example, here’s a chart showing how much of a difference a graphics driver version can make.
There is a lot of other good information in the post as well, so check it out here. If you are still having issues stop by the forums and see if any of our helpful techies can provide some further insights.