It's not certain which titles are FastStart-friendly at this stage. Microsoft knows where it would like to focus your attention, though. It's looking for feedback on the install speed of a handful of games, including Spelunky, The Flame in the Flood and Fuzion Frenzy. That's a hint that at least some games aren't guaranteed to fire up as quickly as you might like. If you're a big Game Pass fan and just can't stand waiting, though, it might be worth jumping on the early release to see where you might save precious time.