I do not think that 10-12 would be a good idea. IMHO it is possible to reach Level 5 in Act1 ..... You would be at Level 8-10 at the end of Act 2.... What's left for Act 3?
Not necessarily. If Larian is using the correct XP Calculator based on 5e rules and the XP charts then you can expect a massive slowdown in level gain by level 5-6.
If you want to see for yourself take a look here:
a standard 5e XP calculator
https://kastark.co.uk/rpgs/encounter-calculator-5th/and this is the XP required to advance chart for 5e D&D
![[Linked Image from i.imgur.com]](https://i.imgur.com/dek9szY.jpg)
The first three levels in 5e are designed to be SUPER easy to get to - essentially the game really BEGINS at level 3.