Image shake on Safari

Why is it fixed on safari and on other browsers not – there it scrolls.
Safari is one browser that can not handle good the css with background-attachment : fixed.
there are workarounds here on board – to set the background-attachment : scroll and place a pseudo-container with the inherited image as background and place the pseudo-container on position : fixed

Edit – may i ask you why you had to work with the slider? and not with a 100% color-section. this Element is not so performance intensive.
have a look at: https://webers-testseite.de/jaime/ – with safari

/*********** Safari Fix for background-attachment: fixed  **************/
/********* give a custom-class to the color-section:   bg-fixed  ***********/
/***** Set the image to background-attachment : scroll and :  **********/

.avia-section.bg-fixed  {
	-webkit-clip-path: inset(0 0 0 0);
	clip-path: inset(0 0 0 0);
	background-size: 0 !important;
	overflow: hidden;
	position: relative;
}

.avia-section.bg-fixed:before {
  background-image: inherit !important;
  background-repeat: inherit !important;
  background-size: cover;
  background-position: inherit;
  content: "";
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: -1 !important;
  pointer-events: none;
  will-change: transform;  /*** if you got more than 3 images like this - comment this out ***/
}