Images get 404 error during page load

[llucab]

Hello,

I hope this would be the right section. 

I'm currently using a plugin (BigBuy Module) that runs CronJobs and automatically create products from an external server.

During the loading of the page, some products are loaded but some images go into 404 error and since they are server requests, they make the website slow.

These requests can last even 1.6 minutes as shown on my screenshot. How can I prevent or stop a request that goes into 404?

Thanks so much.

I am attaching this console screen:

Edited November 27, 2019 by llucab (see edit history)