I've had 3 female dovii that I have grown out from 2"...
One grew like a weed till 6" and has only put on an inch since, she's 1.5 years old. The second grew like a weed till 5" and slowed down, only putting on .5" in a couple months. The third grew very very slow, only grew 1.5" in about 5-6 months, she ended up getting killed by the largest Dovii.
There are a lot of factors, tank size, water quality, is there any other dominant fish in the tank, etc..