Is RESCENE's trainee period shorter compared to BABYMONSTER and NMIXX?

Since BABYMONSTER and NMIXX are from major agencies like YG and JYP, they seem to have a systematic approach that helps them perform live well, and most of these idols tend to have long training periods. In comparison, looking at RESCENE's live performance, it felt a bit lacking—is it because their trainee period was short?
They will continue to do encore songs moving forward, so I wonder if they just weren't feeling well today.
I hope they do better next time so there won't be any controversy.