It's very depressing to see Symfony2 at the bottom of these lists. Although there are quite a few performance optimizations that can be done to improve this, there are few excuses for such poor performance by default.
A few frameworks have a "stripped" version (just Django and Rails so far) to try to show the best that can be achieved when typical functionality is stripped out. Essentially optimizing for this test, which is interesting even if it isn't the point of these benchmarks. If you think Symfony2 would benefit from a separate "stripped" test then please consider a submitting a pull request with that.