Docker itself doesn't add much latency. It just makes getting MySQL and PostgreSQL easier. If anything, it helps with dependencies. The database server startup still isn't great, though.
If you don't use Docker, you can just leave the database server running in the background, which removes the startup latency (you can of course do this with Docker too, but Docker has a tendency to use quite a few resources when left running in the background, which a database server on it's own won't).
I mean that's an `apt install postgres` or `brew install postgres` away. Takes about 5 minutes. I guess it could become a pain if you need to work with multiple different versions at once.
