While that does, technically, "matter", it doesn't really matter to users. I've been using it for a few minutes and I too can confirm that it feels very, very fast. Which is all that matters. In fact, a few years ago, Mozilla confirmed that seeming faster is much nicer than actually being faster:
The point is, the Chrome guys executed well enough on their iOS app that the inherent performance issues really don't seem to be a problem (though I've only been using the app for about 5 minutes so my opinion is limited). And it's quite a pretty app. It brings just enough of the Holographic UI to look nice without looking alien on iOS. They did well.
(App Store apps can't allocate pages with the executable bit set, which is a good idea really.)