Advance to Act 3?

[claudius]

On my previous play through I made sure to complete every possible quest (excluding WM2 and depths of the Od Nua) before I advanced to Act 3.

This current play through I have done much the same, but I have curiosity for whether this is necessary?  Is there a better time to go to Act 3 than the way I've been doing?  This play through I haven't opened the Battery but I have the cantec and tile.  But mainly I am just curious what the impact of advancing to Act 3 sooner would be??

Thanks