He's probably noticing that Awesome doesn't have the lag and jitter problems that compositing window managers have, and is erroneously attributing it to the small footprint.
From a user's point of view it's very reminiscent of the bad old days when swapping was common. But don't worry guys, even Windows 7 and Lion (Apple has been working on the compositing thing for what... ten years now?) still stutter and stall just like Compiz. I'm sure it will be like this forever.