> Fuchsia/Zircon, the context switch would be notably 'very, very slow The part that the Intel fixes makes slow is the mode switch, since you need to flush cac

> Fuchsia/Zircon, the context switch would be notably 'very, very slow The part that the Intel fixes makes slow is the mode switch, since you need to flush caches and trash data that may leak. Making it async doubles (at minimum) the number of mode switches needed to do work.