As the recent kerfuffle with the Activity Finder has proven, there are still performance improvements to be made to The Elder Scrolls Online. The latest November update for such improvements has granted a brief list of what players should see in the coming year.
Update 25, which is expected sometime in Q1, promises a patching overhaul, faster loading of fixtures and characters, the second phase of behind-the-scenes combat ability improvements, and frame rate improvements. All of these features are on schedule, but players are being alerted that the new patching process will mean a re-download of the ESO game client.
Moving on to Q2 and Update 26, the team will focus on making pets less taxing on the servers, multi-threading player character loading, and the next phases of frame rate and behind-the-scenes combat ability improvements. Work on the account database “cold storage” has not started yet, however, which means that will be pushed back to some time in Q3/Update 27.
source: official site