This is simply a small update to fix a persistent hitching issue that around 50% of users were getting, where there a was frame hitch every 3-5 seconds happening consistently. Sorry it took so long to sort this out - this bug was elusive and took us a lot of trial and error to track down, but it has been our priority as it pretty much made the game unplayable for a huge number of you.
We wanted to make sure this fix was added as soon as possible so did not add in anything else that that will need further testing - but bigger overall performance update, along with plenty of new content, will be with you around the time of Realms Deep!