This week, Roku is starting to roll out its major Spring update to the best Roku TVs and best Roku streaming devices . It's unclear if any new features will launch with this update, but it should largely be a boon to performance. Roku OS 15.2, confirmed by Cord Cutter News, will feature mostly under-the-hood changes. On the front end, that should translate to smoother navigation, faster launches and better video playback. A rough time to launch an update (Image credit: TCL) The Roku OS 15.2 rolls out at a controversial time for Roku. The company and manufacturing TCL are facing a class-action lawsuit over updates that have allegedly "bricked" TCL-made Roku TVs. Tom's Guide readers responded to the news, with one reader saying, "I just tossed a 43" TCL Roku that just would not come back on after updates." Roku did tell Tom's Guide that it believed the lawsuit is without merit. Get instant access to breaking news, the hottest reviews, great deals and helpful tips.…