A simple benchmark for Fast API vs. flask.
This uses poetry to manage dependencies, so you should just need to install poetry, and then run poetry install to start.
If you're running this yourself, you'll have to change a couple constants because I was too lazy to fix them scoped these out of the initial release. Search for #CHANGEME for a hopefully complete list.
Assuming all goes well, you should be able to run your own benchmarks using poetry run python benchmark_runner.py. If all goes well, this should populate output with some new CSVs (you can check by seeing if they change with git status).
For those not willing to try get this working on their machine, I've included some analysis in iPython notebook form. The tl;dr: FastAPI outperforms Flask in cases where there is a lot of waiting for I/O, Flask massively outperforms FastAPI if there's a lot of JSON to parse, and is faster than FastAPI for CPU heavy workloads though that data might be too close to make definitive judgements on.