Yikes, I've been playing this on a laptop with intel HD 4000 in linux and the only time the game is choppy is when I accidentally unplug it, battery drains, and computer throttles down.
That said, I'd really like cloaks to show too but realize it's probably not going to happen on linux, not any time soon. Obsidian made the call to use Shroud which came out at a time when linux + gaming wasn't even a thing. Shroud has its own runtime which they'd have to port to linux, not an impossible task, but if Obsidian is already heavily invested in shroud (monetarily), at best they can keep pestering Shroud for support with the builds on OSX.
So linux people could pester Shroud, or Obsidian could jump boat to something else like (random example) http://www.havok.com/products/cloth and back track on any money spent with shroud license and development time for integration, or who knows, shroud told obsidian they're working on linux support but keep it under wraps and working on the mac issue with unity version being used here and Obsidian is waiting it out hoping for the best given the money and time that's gone into it.
Either way it's a tough call on the developer's part, but I sure would like cloaks