Windows Phone Central reports Microsoft's Windows RT operating system received eight updates on Patch Tuesday, including a firmware update related to security and some patches to improve app performance. The updates didn't address the Surface RT's audio stuttering issue though.
Over at the Verge they claim that the update also improves performance of apps starting up: “On average, apps launched around two seconds faster than before, a noticeable improvement.”
That is certainly good news as we think the Surface, while a little rough in some areas, can be greatly improved over the next few months with frequent updates. Our own update took about 20 minutes (device kept going into Standby) and it does require a soft reset. So far, performance looks good though it's hard for us to definitively say things are faster.