I didn't see any performance issues, once its loaded it seems to work the same as everything else. The style I did was more like loading a remote module (child domain) then hosting a sandboxed app instance. Like Alex said it is heavier then modules (not really sure how much, as we didn't test modules much), but modules are not supported in mobile. Even though we are not using mobile right now we wanted to leave the door open for Chromebooks later and this method allowed that.
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