Slowdown on local or shared server

I’ve been searching before opening the topic now in 2022, but I didn’t find anything that had a solution.

I installed Kanboard on my local machine and also on shared hosting. In both the app is very slow.

I know html, php, sqlite, etc, and I really can’t see any reason for this slowness, as it’s a very lean app.

I would like to know if there are more people with this problem, if they have already analyzed this situation better.