If you have lag, it is likely related primarily to your screen - There are other posts on the forum, and make sure your screen is in Game mode if it has one.

please~~
My host is Piboy DMG,
I want to connect two external joysticks, Play1 + Play2,
But I want Piboy DMG built-in joystick and external Play1 joystick to control Play1 together,The Play2 is another Play2 joystick, the joystick is PS1 specification.

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Because when I set up the two joysticks, I also set the "Combo" button, the Play1/2 joysticks can be sure to combo, but the built-in joystick of Piboy DMG can be controlled but cannot be combo.

Ths.^^

I think I did something useful for this issue. Take a look: https://github.com/meleu/RetroPie-input-selection

And let's talk about it at a proper thread: https://retropie.org.uk/forum/topic/1167/here-is-a-way-to-select-input-for-retroarch-players-1-4