I last played dragon story back in 2015. I stopped because I thought my phone at the time (Samsung SII) was not powerful enough to run it, it was laggy and took ages to load.
I finally got a new phone (C5 Pro) with decent mid range specs and tried the game again. I still takes ages to load, interface is still laggy, navigating through menus is a pain. It also seems that there have been no improvements to the game since I last played. I don't know if people are still using it or if S8 has kept it up to date as it seems exactly the same as the same game from years ago.