The PSX 2D games run with sound at an acceptable speed with PSX4All on the Dingoo A-380. The 3D games don't but it was to be expected.
If you want to play Oddworld: Abe's Oddysee you've got enable the Graphics fix or it won't look good like in the video. There's a fix for the L2 + Left/Right button so it's possible to make Abe sneak.
Try Strider 2. It runs good and it's a nice game to play.