I'm not as familiar with native windows apps anymore but the difference typically is that while there is a faster path on native it's not as critical that it's taken. As in, the slow path is still generally fast enough.

That certainly used to be true on win32 (in that an animation of left/top would easily hit 60fps on a desktop computer), but maybe Microsoft's UI toolkits have regressed significantly? I rather doubt it, though, and suspect that it would still work just fine on a native windows app even though the web equivalent grinds to a halt.