Cura 15 vs Cura 2 print time

[musyne 0]

On some models I notice a big difference between the 2 versions.

For example a slice done by Cura 15 will print in 3 hours and the same model prints in 5 hours with Cura 2.

I'm using an UM2+.

I know the default presets are a bit different between the 2 versions but I was wondering if anyone has the same experience.

How comes Cura 2 can produce much slower print?

[nallath 1,124]

First off; The estimations of Cura 15.x are way worse compared to Cura 2. This is mostly because Cura 2.x also takes acceleration into account.