i run flask app FLASK_ENV=development flask run
i haven't touched locally installed python for 2-3 months
unexpected behaviour:

server starts slowly than previously
usually with FLASK_ENV=development server reloads when files change(after file changed reloading will perform in 40-50 seconds)

i did:

re-install pythons(3.8,3.9)
re-install wsl(debian, ubuntu)

p.s. usually wsl command installs high distributive version, but today 09.12.2022 wsl command installs debian 9???
problem have solved through switching to wsl version 1
p.s. reason to post this question - poke the problem for another developers
wsl python works slow