Out of all of Xbox’s studios (of which there are admittedly fewer now following mass layoffs and studio divestitures), Blizzard is reportedly the “top performing.” That’s according to a new report from Windows Central based on emails sent by Blizzard president Johanna Faries to staff last week. In the emails, Faries celebrated the studio’s performance ahead of BlizzCon in September, an event she hopes will “serve as a powerful springboard into a new era of momentum and excitement.” Faries went…