Is the image loading promptly? Do we need to adjust the resolution?

Is there a way to decrease the loading time of images? For instance, if I have 20 identical images on my homepage (each sized at 1920x1080)

This is the image:

I want to crop the image to a fixed size. Here's the CSS code I am using:

.startpage_image_container{
max-width: 100px;
max-height: 200px;
display: inline-block;
}

.image{
object-fit: cover;
object-position: center center;
height: 200px;
width: 100px;
}

.section{
  width: 300px;
}
<div class="section">
<div class="startpage_image_container">
  <img class="image" src="http://www.wallpaperup.com/uploads/wallpapers/2013/03/28/65631/big_thumb_3c7c52cc466a1c188ced0ff17d2ea558.jpg"/>
</div>
... // More repetitive image containers with the same image source
</div>

Despite these efforts, image load times remain high. How can I use PHP to optimize and reduce image loading times? Furthermore, how can I implement content reloading when users reach the bottom of the page?

Answer №1

Here is the code snippet I often use:

<?php
 echo "<script>
      // Utilizing preloader function to preload images
      function imagePreloader() {
        if (document.getElementById) {
          document.getElementById(\"preload-01\").style.background = \"url('img/image1.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-02\").style.background = \"url('img/image2.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-03\").style.background = \"url('img/image3.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-04\").style.background = \"url('img/image4.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-05\").style.background = \"url('img/image5.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-06\").style.background = \"url('img/image6.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-07\").style.background = \"url('img/image7.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-08\").style.background = \"url('img/image8.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-09\").style.background = \"url('img/image9.png') no-repeat -9999px -9999px\";
          document.getElementById(\"preload-10\").style.background = \"url('img/image10.png') no-repeat -9999px -9999px\";
      }
      function loadImages(func) {
        var oldLoad = window.onload;
        if (typeof window.onload != 'function') {
          window.onload = func;
        } else {
          window.onload = function() {
            if (oldLoad) {
              oldLoad();
            }
            func();
          }
        }
      }
      loadImages(imagePreloader);
      // End of image preloading functions
    </script>";
?>

Answer №2

Why are there so many images on this page? Let's try using just one :) PHP doesn't make resizing images easy without knowing the browser's height and width. However, with JavaScript, you can dynamically resize images to fit the browser's resolution before loading them. I created a quick plugin that might help with this. It utilizes the srcset attribute, although it may not currently work as expected.

Check out the plugin here

The plugin essentially determines the best size for displaying different resolutions of images. While it works, there may be better methods available.

Alternatively, if the issue lies in the number of images being loaded, consider using javascript to clone images instead of duplicating them in the HTML code multiple times.

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