DFRobotDFPlayerMini.h software volume control

Hopefully someone can direct me to a solution for the volume control of this player. 

After I send a volume control ( mp3Player.volume(x) ) I have to wait at least 100ms ( delay(100) ) before I can send a mp3Player.play(x).

Is there a way to shorten this waiting time ?

(I'm using ESP32 and #include <DFRobotDFPlayerMini.h>)

thanks in advance!