Product Images Take up to 15 secs to load

My website is http://www.wineandbaraccessories.com
All my images are highly compressed and optimized.
When clicking on a product, the description comes up fairly quickly, but the image can take up to 15 secs to load.
What can I do to speed it up?
I use WP Super Cache per your recommendation.
Looking forward to hearing from you.

Hello,

Could you please check how it works with default WordPress theme to understand is it theme related issue?

Thank you

Using the default theme, the pictures are immediately shown and there is not a problem.
Problem seems to be with the Basel theme.

Can you also disable all additional plugins except those that required for our theme?

I disabled all plugins and it worked fine.
I added plugins back one at a time and discovered that the plugin ‘Redux Framework’ is causing the problem.
I did not add this plugin so it must have come with the theme.
Anyway, it is disabled. If I need it, please let me know how to fix it.
Thank you.

Strange, but we just tested your website and it works correctly with the plugin enabled too.

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