No, Titanium doesn't compile to native code. He's using that as shorthand for "Titanium uses JavaScriptCore to implement a bridge that lets your JavaScript call native code". Your JavaScript remains interpreted (and will not be JIT compiled, as in Safari, since your app won't have the JIT entitlement) but in my testing of JSCore it's not generally a bottleneck.
Comments
No, Titanium doesn't compile to native code. He's using that as shorthand for "Titanium uses JavaScriptCore to implement a bridge that lets your JavaScript call native code". Your JavaScript remains interpreted (and will not be JIT compiled, as in Safari, since your app won't have the JIT entitlement) but in my testing of JSCore it's not generally a bottleneck.