In this new post on Mgccl's blog today, there's a response to these benchmarks from John Walsh concerning which is faster - a for loop or a while loop.

In this new post, Mgccl, he points out two other examples that show that a while loop is always faster than a for loop. To help prove the point, he's also included a screencast where he shows the code he's using to run the benchmarks (several different tests).

His results, matching the results from the other reports, not only shows that the while loop is faster (still only slightly), but also consumes less memory in the process.