Algol Plus Ltd

This plugin adds extra hooks

add_action('woocommerce_add_to_cart', 'woo_ml_proceed_to_checkout');

add_action('woocommerce_cart_item_removed', 'woo_ml_proceed_to_checkout');

These hooks work  slow (0.5 seconds per cart item) !

So you should use this code 

add_filter( 'wdp_exclude_hooks_when_add_to_cart_calculated_items', function($hooks){
  $hooks[] = 'woocommerce_add_to_cart';
  return $hooks;
});