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Welcome Benchmark for Python Web Frameworks


This project has been superseded by:

This benchmark is the default hello benchmark in that tool.


This is a simple benchmark for Python web frameworks. To run them do the following:

$ virtualenv env
$ source env/bin/activate
$ pip install -r requirements.txt

You can then run the benchmarks:

$ python

This prints out benchmark information for all the included frameworks.

If you want to ensure processor affinity you can try this:

$ taskset python

You can repeat with environments for Python 2, Python 3 and PyPy.

To create a PyPy virtualenv:

$ virtualenv --python=pypy env_pypy

To create a Python 3 virtualenv:

$ virtualenv --python=python3 env_py3

requirements.txt contains the latest release or release candidates of the frameworks in question at the time of writing. It would be interesting to have different sets of requirements so we can compare changes over time.

What this means

The benchmark runs 100,000 requests against each web framework, using the WSGI directly. No real HTTP server is therefore involved, nor are any requests handled in parallel -- it only means how much time the framework takes in Python.

ms is the amount of milliseconds it took to fulfill all 100,000 requests. rps is the amount of requests per second the framework was able to sustain.

The benchmark also runs a single request with the profiler after this, and reports in tcalls how many function calls the request took, and in funcs how many different functions were used to handle the request.


Be warned that this benchmark is silly in various ways:

  • no real HTTP benchmarks are done, only WSGI stuff, single-threaded in a highly synthetic environment.
  • Only "hello world" is benchmarked.

High performance in "hello world" is almost never useful in the real world, as application code tends to dominate the framework by far. Don't pick a framework because it has the highest numbers in this benchmark. I realize it's tempting as it's such an easy thing to bikeshed over, but don't.

Pick a framework because it's easy to use, because it's flexible, because it helps you solve difficult problems. Only if you know you are doing some low-level in-memory stuff where you need to have a ridiculous throughput is where framework performance might start becoming important.

To a web framework author like myself (Morepath) a benchmark like this is still useful as it gives an idea of how involved framework code is, and to at least ensure it's not slower than some of the more common web frameworks.


You use the -f flag to restrict the frameworks to benchmark, for instance:

$ python -f morepath -f flask

to benchmark just Flask and Morepath.

You can use the -n flag to change the number of requests to use in the benchmark:

$ python -n 1000

the default is 100000.

With the -p flag the tool also generates profile information on which functions it spent the most time in.


This benchmark is adapted from the 01-hello example by Andriy Kornatskyy, author of wheezy.web.

I've simplified things considerably. I only install web frameworks that seem to be reasonably popular and that are easy to install from PyPI with pip. I've excluded some frameworks because they seemed very slow; it's possible they aren't actually slow but that the benchmark code was broken, but I didn't want to bother.

In addition there's Morepath, authored by myself, and wheezy.web, as Andriy wrote that.


Hello world compared in various web frameworks.



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