i use to have that problem but ai try types of pikin if you one thing about speed is that u have to relax ur hand and try to do massage at your hand for relaxing
and try wand it uses metronome in a fast velosity but that you can do it well when you do it you can incris at a fast velosity but try to do it with exercises of string skiping to give to exercise the two hands


Garitubituzaby