Most of the medium sized centrals are painfully slow growers, at only an inch every 2-3 months.
Clean water and frequent feedings tends to speed this up. I can’t stress this enough. For a year after getting my .5 inch Dempsey, I got it to barely 3 inches by infrequent water changes and infrequent feedings. Then I got smart about it and dramatically increased both. He is still only about 5.5-6 inches, but getting tall and fat even faster. That growth rate increase started around January, and I started good care practices last September.
Most larger cichlids will grow fast until 4-8 inches but then dramatically slow down.
On one hand you have cichlids like gts and festaes, which have decent to huge adult sizes, but take forever to reach it.
Then there are oscars and pbass, which just don’t stop growing and can put on a few inches in a month at their best.
If you love salvini cichlids (based on your username I assume you do), I’d say go for it because it will be worth it when you have grown out a monster after such a slow time.