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PHP has a long startup time while Python, apparently starts faster. What the benchmarks prove on a simple app that display "Hello!" is which language has the best startup time! On a full app as Wordpress, the results may be different. Facebook still uses PHP (compiled) and not Python and so do lot of websites.

The Php frameworks in question are not exactly micro frameworks.

The Php frameworks are brought up and torn down on each request - they are not daemons.

The Php frameworks here, use a lot of file reads (many include files), compared with some of the slimmer micro-frameworks.

Those towards the bottom are either more Rails-like, i.e. they do a lot of "magic" in the background; or they are huge, with hundreds/thousands of files. There are lots of lightweight PHP frameworks not listed.