Google drive and 18.04

Why on 18.04 LTS to open remote folder google-drive I’ve to wait much time (ie 3-4 min)?
Instead on 19.04 is so fast (3 sec)

not really sure why it takes so long on 18.04 for you. I am aware though that around 18.10/19.04 timeframe GNOME introduced better google integration. So its probable that 18.04 the support was rather experimental/done by other means and was better integrated later.

overGrive is a fine alternative, if you don’t mind paying a little bit of money. I’m using it on 18.04.