yes but it took much more time than other days ... they were not supposed to fix this in this epoch ?

no, where did you get that impression from? it is actually going to be worse for a period, when other DEXes will also lunch, but in a few months (my expectation) we will see some big improvements. there is also a hard fork schedules for February (theoretically), I am not sure if the CIP31, CIP32 and CIP33 will be included or not. If yes, we will see the improvements much sooner.