Hello chook,
Please go through the following steps to slow down the slider:
1. Create Child theme of the original theme (Please see https://codex.www.ads-software.com/Child_Themes#How_to_Create_a_Child_Theme).
2.Then copy and paste 4 folders and 1 file : assets->frameworks->bxslider->js-> jquery.bxslider.js from parent theme into child theme.
3. After acitvating Child theme Go to assets->frameworks->bxslider->js-> jquery.bxslider.js and change the value of speed say 3000, and adaptiveHeightSpeedsay,1000.Adjust the values as necessary.
4. Go to Child theme ->functions.php, then replace the code inside it by following code:
<?php
//
// Recommended way to include parent theme styles.
// (Please see https://codex.www.ads-software.com/Child_Themes#How_to_Create_a_Child_Theme)
//
add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );
function theme_enqueue_styles() {
wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );
wp_deregister_script('jquery-bxslider'); // Deregister parent scripts file
wp_enqueue_script('jquery-bxslider', get_stylesheet_directory_uri() . '/assets/frameworks/bxslider/js/jquery.bxslider.js', array('jquery'), '4.0', true); //replaced by new scripts in child
}
I hope this will help to solve your issue.
Thanks for your time!