Re: x5 Speed Increase on Server Side with Swift?
Take these performance numbers with a very large grain of salt. There's several problems with these sorts of comparative benchmarks. The first it that they are always micro-benchmarks with very little real content. A particular web framework may be a top performer at one micro-benchmark and down near the bottom on another. Have the various frameworks serve real data and they may start to converge on fairly similar numbers.
Another problem is that the authors of these comparative benchmarks may know a few web frameworks, but they rarely know half a dozen or a dozen fairly well. For the ones they don't know they generally just google some tutorial examples and end up with a configuration that is very suboptimal and not uncommonly using deprecated methods. Someone who knew what they were doing with it might get a totally different set of numbers.
A common problem is that particular frameworks may address scaling across multiple cores in different ways, but the author wants to make them all the same in order to be "fair". So he ends up using the best case for his favourite (and best known to him) framework while disadvantaging other frameworks who need a totally different set up.
Yet another problem is that there was no indication of memory consumption, other than the author noted he didn't get any out of memory errors. RAM consumption is often more important than CPU load in real world web applications, but it's hard to come up with useful benchmarks without putting more work into each test than the author is willing to spend on it.
Still yet another problem is that different frameworks may be oriented towards solving different problems. One may be oriented towards high volume web sites, while another may be oriented towards being able to set up a lower volume site with minimal man-hours and cost involved. The latter (smaller web sites) are far more common than the biggest sites.
So while these comparative micro-benchmarks can be interesting at times, you generally need to know a lot about each one before you can tell if the author knew enough about what he was doing for the numbers to mean anything.
So overall, take it with a grain of salt.