Preconditions (*)

  1. Magento 2.2.7 and Magento 2.3 Product Gallery
  2. Product page gallery with sample data is installed on the luma theme with additional images (minimum 5+).

Steps to reproduce (*)

  1. Configure product gallery to use thumbnails on mobile.
<var name="breakpoints">
    <var name="mobile">
        <var name="conditions">
            <var name="max-width">767px</var>
        <var name="options">
            <var name="options">
                  <var name="arrows">true</var>
                  <var name="navarrows">true</var>
                  <var name="nav">thumbs</var>
  1. Navigate to a product page with more than 5 images on Chrome Android or Chrome Dev in mobile mode.
  2. Attempt to scroll through the thumbnail gallery and you will note sluggish/slow performance.

Expected result (*)

  1. Smooth responsive behaviour

Actual result (*)

  1. Sluggish and unresponsive

Additional information

  1. Video of poor performance: https://www.dropbox.com/s/fjjnxsiohgsn8mf/20190206_095707.mp4?dl=0

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