Hi,

No - that's lazyload images - it helps your site load faster. If you don't want to use lazyload images, you can disable lazyload images from the theme via:

Disable lazyload images on category mega menu on Customize > Logo and Header Options 

Disable lazyload images on all layouts, widgets on Customize > General Options 

Disable lazyload images on featured slider on Customize > Featured Slider Options 

Disable lazyload images on single posts page on Customize > Single Post Options

As I checked, your hosting take a few time to response the website requests.

So, I'm sure this is not issues related with the theme itself. It come from your hosting or plugins.

Maybe you should check with your plugins first ( let's try deactivate all plugins and check it again. If it loads faster, let's activate each plugin to check what's plugin make your site loads slower )

Best Regards,

PenciDesign