Very slow server respond times when creating thumbnails

The CMS Questions
1

I got the problem that my localhost got really slow respond times and I think I hunted the problem down to the thumbnail creation process. At the moment I need ~12 seconds for every page refresh which drives me crazy.

First I thought it is a problem with xampp or something but I guess it is my code. I am generating a simple image gallery with ~15 images and create smaller thumbnails for each image and a bigger version for when you click on it. If I comment out this code the loading times go from ~12 down to ~3-4 seconds (which would be respectable but still not very fast)

<?php 
	$count = 0;
	$images = $module->images()->sortBy('sort', 'asc'); 
?>

<?php foreach($images as $image): ?>

       <?php $thumb = thumb($image, array('width' => 1300, 'quality' => 80, 'crop' => false), true); ?>
	<?php ++$count; ?>

	<figure class="4u<?php ecco($count % 3 == 0, '$', '') ?> 6u<?php ecco($count % 2 == 0, '$', '') ?>(narrow) 12u(mobile)">
	   <a href="<?php echo $thumb->url() ?>" data-size="<?php echo $thumb->width() . 'x' . $thumb->height() ?>">
              <img data-src="<?php echo thumb($image, array('width' => 400, 'height' => 266, 'quality' => 80, 'crop' => true), false) ?>" alt="<?php echo $image->caption(); ?>" />
	   </a>
	   <figcaption><?php echo $image->caption(); ?></figcaption>
	</figure>

<?php endforeach ?>

Now I question myself why this slows down my page (the server respond time) so much? Doesn’t kirby recognize when the thumbnails are already created and will just serve them? How could I improve my code so that it’s faster?

Any ideas of what common pitfalls for performance issues can be? I also often need something like $pages->find('somePage'); is this a problem or is there a better way to serve a page that you often need (instead of searching it)?

2

@Andi-Lo:
You use the Kirby-default-thumbs driver “gd”?
If not, change this to the default, because the “im” driver does not exist on Windows-XAMPP.

Does the \thumbs directory exist?

Good luck!

3

using c::set('thumbs.driver','gd') sadly does not do the trick :frowning:

The thumb folder exists and all thumbs are already generated. Also its just appearing to be slow on my localhost and not online. When I visit the page on my dev server everything responds fine. Locally it just appears that the browser reacts with very slow "waiting for localhost… " . I tried to remove any addons and also tried different browsers (even different pc’s). Further I tried to use php -S localhost:8080 instead of xampp but without success.

4

The gd driver is the default driver, anyway. Once the thumbs are generated, the performance should indeed improve, because existing thumbs should not be not generated again.