It's a pretty tenuous idea that seems to be based on the assumption that the brain is like a single core CPU, and wasting a few ms extra on visual decoding will leave less processing power available to reason about code. Also seems to assume that every time you "scan" a scene that your brain has to start from a blank slate, whereas my own (probably stupid and not based in any presentable scientific fact) assumption would be that it's more of a delta process.