Thank you for this tip!
The boot is faster disabling "wait for network"
and I don't have this text between splashscreen and emulation station.

So, for anybody having buggy bluetooth with 2 PS3 controllers
with a Raspberry Pi 3B+ and Retropie,
here is a solution:

disable wifi with [f4] "rfkill block wifi" disable wifi with @cyperghost 's script:

Thanks again everyone,
we are going to have fun with my friends! :D