To change the speed of the transition itself (not the time each slide is displayed, that can be set in the module). Note: the animation style, applies to the module itself, not to individual slides, and the individual slides don't have an animation setting.

/* -- START change transition speed -- */
.et-pb-active-slide, .et_pb_slide {
animation-name: fadeIn !important;
animation-duration: 1.5s !important;
animation-timing-function: ease-in-out !important;
}
Code language: CSS (css)