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CSS

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HTML 

              
                <div class="block-1">
    Lorem ipsum dolor sit amet consectetur<br> adipisicing elit. Sit in quaerat hic labore <br> quidem odit dicta ea minus<br> alias! Pariatur quos nesciunt doloremque quas quisquam ipsum voluptas, temporibus <br>voluptate id.
</div>

<div class="block-2">
    Lorem ipsum dolor sit amet consectetur <br>adipisicing elit. Sit in quaerat hic labore quidem odit dicta<br> ea minus<br> alias! Pariatur<br> quos nesciunt doloremque quas quisquam ipsum voluptas, temporibus voluptate id.
</div>

<div class="block-3">
    Lorem<br> ipsum dolor sit amet consectetur adipisicing elit. <br>Sit in quaerat hic<br> labore quidem odit dicta ea minus alias! Pariatur<br> quos nesciunt doloremque quas quisquam <br>ipsum voluptas, temporibus voluptate id.
</div>


<div class="containerr">
		<section class="gallery">

			<div class="frame">
				<div class="frame__content">
					<h2>Beautiful World</h2>
				</div>
			</div>

			<div class="frame">
				<div class="frame__content">
					<div class="frame-media frame-media_left" style="background-image: url(images/1.jpg)"></div>
				</div>
			</div>

			<div class="frame frame_bg">
				<div class="frame__content">
					<video class="frame-media frame-media_right" src="media/video_optimized.mp4" autoplay loop muted></video>
				</div>
			</div>

			<div class="frame"></div>

			<div class="frame">
				<div class="frame__content text-right">
					<h3>Pure planet</h3>
					<p>Lorem ipsum dolor sit amet, consectetur elit adipisicing. Nemo fugit, rerum dolorem assumenda consequatur dicta error iure laboriosam temporibus.</p>
				</div>
			</div>

			<div class="frame frame_bg">
				<div class="frame__content">
					<div class="frame-media frame-media_left" style="background-image: url(images/2.jpg)"></div>
				</div>
			</div>

			<div class="frame"></div>

			<div class="frame frame_bg">
				<div class="frame__content">
					<div class="frame-media frame-media_right" style="background-image: url(images/3.jpg)"></div>
				</div>
			</div>

			<div class="frame"></div>

			<div class="frame">
				<div class="frame__content text-left">
					<h3>Ask the Mountains</h3>
					<p>Lorem ipsum dolor sit amet, consectetur elit. Rerum dolorem assumenda consequatur dicta error iure laboriosam temporibus omnis quae eaque aliquam esse unde accusamus dolores non soluta.</p>
				</div>
			</div>

			<div class="frame frame_bg">
				<div class="frame__content">
					<div class="frame-media frame-media_right" style="background-image: url(images/4.jpg)"></div>
				</div>
			</div>

			<div class="frame">
				<div class="frame__content">
					<video class="frame-media frame-media_left" src="media/video_optimized.mp4" autoplay loop muted></video>
				</div>
			</div>

			<div class="frame"></div>
			<div class="frame"></div>

			<div class="frame frame_bg">
				<div class="frame__content">
					<div class="frame-media frame-media_right" style="background-image: url(images/5.jpg)"></div>
				</div>
			</div>

			<div class="frame frame_bg">
				<div class="frame__content">
					<video class="frame-media" src="media/video_optimized.mp4" autoplay loop muted></video>
				</div>
			</div>

			<div class="frame"></div>
			<div class="frame"></div>

			<div class="frame">
				<div class="frame__content">The end</div>
			</div>

		</section>
	</div>



<!--HTML-code from my example with low performance:

<div class="block-1">
    Lorem ipsum dolor sit amet consectetur adipisicing elit. Sit in quaerat hic labore quidem odit dicta ea minus alias! Pariatur quos nesciunt doloremque quas quisquam ipsum voluptas, temporibus voluptate id.
</div>

<div class="block-2">
    Lorem ipsum dolor sit amet consectetur adipisicing elit. Sit in quaerat hic labore quidem odit dicta ea minus alias! Pariatur quos nesciunt doloremque quas quisquam ipsum voluptas, temporibus voluptate id.
</div>

<div class="block-3">
    Lorem ipsum dolor sit amet consectetur adipisicing elit. Sit in quaerat hic labore quidem odit dicta ea minus alias! Pariatur quos nesciunt doloremque quas quisquam ipsum voluptas, temporibus voluptate id.
</div>



<div class="containerr">
    <section class="gallery">
        <div class="frame">
            text text text text
        </div>
        <div class="frame">
            text text text text text text text text
        </div>
        <div class="frame">
            text text text text text text text text text text text text text text text text text text text text
        </div>
    </section>
</div>

-->
!

CSS 

              
                * {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
:root {
	--index: calc(1vw + 1vh);
	--gutter: 30px;
	--side-small: 26;
	--side-big: 36;
	--depth: 4000px;
	--transition: .75s cubic-bezier(.075, .5, 0, 1)
}

/* Скрываем Scrollbar */
body {
	scrollbar-width: none; /* Firefox */
}
body::-webkit-scrollbar { 
	display: none; /* Safari and Chrome */
}

@font-face {
	font-family: raleway_c;
	src: url(../fonts/raleway-v22-cyrillic-300.woff2);
	font-weight: 300;
}
@font-face {
	font-family: raleway_c;
	src: url(../fonts/raleway-v22-cyrillic-100.woff2);
	font-weight: 100;
}
body {
	background-color: #000;
	color: #fff;
	font-size: calc(var(--index) * .8);
	font-family: raleway_c, sans-serif;
	line-height: 1.75;
	height: var(--depth);
	font-weight: 300;
}
.containerr {
	width: 100%;
	height: 100%;
	position: fixed;
	perspective: 1500px;
}
.gallery {
	transform-style: preserve-3d;
	height: 100%;
}
.frame {
	width: 100%;
	height: 100%;
	position: absolute;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: var(--transition), opacity .75s ease;
	will-change: transform;
	transform-style: preserve-3d;
}
h1, h2, h3, h4 {
	font-weight: 100;
	text-transform: uppercase;
	width: min-content;
	line-height: 1;
}
.frame h2 {
	text-align: center;
	font-size: calc(var(--index) * 3.3);
}
.frame-media {
	position: relative;
	width: calc(var(--index) * var(--side-small));
	height: calc(var(--index) * var(--side-big));
	background-position: center;
	background-size: cover;
}
.frame-media_left {
	right: calc(var(--side-small) / 2 * var(--index) + var(--gutter));
}
.frame-media_right {
	left: calc(var(--side-small) / 2 * var(--index) + var(--gutter));
}
.frame_bg {
	background-color: rgb(0 0 0 / .87);
}
video.frame-media {
	width: calc(var(--index) * var(--side-big));
	height: calc(var(--index) * var(--side-small));
}
video.frame-media_right {
	left: calc(var(--side-big) / 2 * var(--index) + var(--gutter));
}
video.frame-media_left {
	right: calc(var(--side-big) / 2 * var(--index) + var(--gutter));
}
.text-right > * {
	position: relative;
	left: 18vw;
}
.text-left > * {
	position: relative;
	right: 18vw;
}
.frame h3 {
	font-size: calc(var(--index) * 3);
}
.frame p {
	max-width: 30vw;
	margin-top: 3vh;
}




/* Css-code from my example with low performance:

html, 
body {
    height: 100%;
    line-height: 1;
    font-size: 16px;
    font-family: "Raleway";
    background-color: #1e1b1b;
    color: #fafafa;
    height: var(--depth);
}
:root {
    --index: calc(1vw + 1vh);
    --color-header: #f4efec;
    --color-text: #cdc6c3;
    --transition: 0.75s cubic-bezier(0.2, 0.6, 0, 1);
    --transition-many: 0.2s cubic-bezier(0.2, 0.6, 0, 1);

    --gutter: 30px;
    --side-small: 26;
    --size-big: 36;
    --depth: 4000px; 
}

.block-1 {
  margin-bottom: 50px;
}
.block-2 {
  margin-bottom: 50px;
}
.block-3 {
  margin-bottom: 150px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --index: calc(1vw + 1vh);
  --gutter: 30px;
  --side-small: 26;
  --side-big: 36;
  --depth: 4000px;
  --transition: .75s cubic-bezier(.075, .5, 0, 1)
}


body {
  scrollbar-width: none; 
}
body::-webkit-scrollbar { 
  display: none;
}

@font-face {
  font-family: raleway_c;
  src: url(../fonts/raleway-v22-cyrillic-300.woff2);
  font-weight: 300;
}
@font-face {
  font-family: raleway_c;
  src: url(../fonts/raleway-v22-cyrillic-100.woff2);
  font-weight: 100;
}
body {
  background-color: #000;
  color: #fff;
  font-size: calc(var(--index) * .8);
  font-family: raleway_c, sans-serif;
  line-height: 1.75;
  height: var(--depth);
  font-weight: 300;
}
.containerr {
  width: 100%;
  height: 100vh;
  perspective: 1500px;
}
.gallery {
  transform-style: preserve-3d;
  height: 100%;
}
.frame {
  width: 100%;
  height: 100%;
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;

  will-change: transform;

}
h1, h2, h3, h4 {
  font-weight: 100;
  text-transform: uppercase;
  width: min-content;
  line-height: 1;
}
.frame h2 {
  text-align: center;
  font-size: calc(var(--index) * 3.3);
}
.frame-media {
  position: relative;
  width: calc(var(--index) * var(--side-small));
  height: calc(var(--index) * var(--side-big));
  background-position: center;
  background-size: cover;
}
.frame-media_left {
  right: calc(var(--side-small) / 2 * var(--index) + var(--gutter));
}
.frame-media_right {
  left: calc(var(--side-small) / 2 * var(--index) + var(--gutter));
}
.frame_bg {
  background-color: rgb(0 0 0 / .87);
}



.text-right > * {
  position: relative;
  left: 18vw;
}
.text-left > * {
  position: relative;
  right: 18vw;
}
.frame h3 {
  font-size: calc(var(--index) * 3);
}
.frame p {
  max-width: 30vw;
  margin-top: 3vh;
}

}
*/
!

JS 

              
                // 3D Scroll

let zSpacing = -1000,
		lastPos = zSpacing / 5,
		$frames = document.getElementsByClassName('frame'),
		frames = Array.from($frames),
		zVals = []

window.onscroll = function() {

	let top = document.documentElement.scrollTop,
			delta = lastPos - top

	lastPos = top

	frames.forEach(function(n, i) {
		zVals.push((i * zSpacing) + zSpacing)
		zVals[i] += delta * -5.5
		let frame = frames[i],
				transform = `translateZ(${zVals[i]}px)`,
				opacity = zVals[i] < Math.abs(zSpacing) / 1.8 ? 1 : 0
		frame.setAttribute('style', `transform: ${transform}; opacity: ${opacity}`)
	})

}

window.scrollTo(0, 1)





/*The code that your colleagues suggested to me, which really helped.  But it has very low performance and strong lags when scrolling in the opposite direction: from bottom to top:

let frames = gsap.utils.toArray(".frame"),
    overlap = 5,
    time = 0,
    tl = gsap.timeline({
            defaults: {ease: "none", duration: 1},
            scrollTrigger: {
              trigger: ".container",
              start: "top top",
              end: "+=2000",
              pin: true,
              scrub: 0.5
            }
          });
frames.forEach((el, i) => {
  tl.fromTo(el, {opacity: 0, z: -2000}, {opacity: 1}, time)
    .to(el, {z: 2000, duration: 8, ease: "power2.out"}, time)
    .to(el, {opacity: 0, duration: 1}, "-=100%");
  time += 8 - overlap;
})

*/
!
999px

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