It is true that there is no sandboxing in the sense of Android or iOS, however sandboxing does NOT give you any implicit leak of performance guarantees, unless we’re talking about complete virtualization (and we aren’t if we’re talking about Android and iOS). There is no way for the OS to tell whether CPU/memory usage is a leak or rightful use, regardless if you’re inside a sandbox or not. It *can* be easier to manage, but sandboxing is NOT a performance oriented measure, especially as most sandboxing methods incur a certain level of overhead. Security is of course a different story.