Very Slow Query

Hi,

i’ve got a website using Taxonomy Images. We have a lot of categories (300+) with Taxonomy Images. The website became extremely slow. With Query Monitor I found that Taxonomy Images is the cause.

What I think what is happening: When opening a category with subcategories, not the subcategories are loaded which are used at that time, but every single term with a taxonomy image, without those being displayed.

This is my code:

<?php
$cat = 3;
$term_meta = get_option( "taxonomy_{$cat}" );?>
<?php
$cat_id = get_query_var('cat');
$catlist = get_categories('parent=' . $cat . '&hide_empty=1&number=20');
echo '<ul class="categorieoverview">';

foreach($catlist as $categories_item)
{

    $terms = apply_filters( 'taxonomy-images-get-terms', '' );
    if ( ! empty( $terms ) ) {

      foreach( (array) $terms as $term ) {
        if($term->term_id == $categories_item->term_id) {
	$img = $wp_get_attachment_image;
      if (!empty($img)) {
$show = block;
}
else { $show = none; }

Does anyone have an idea what goes wrong and what makes the site this slow?

Thanks in advance.