Caching course image

[a-mian-lateral]

Hello, I would like to know if there is something I can do to cache the course images. The problem is that when I have a lot of courses, it takes a while to load all the images.

I'm trying to understand if this is a server configuration issue or a behavior of the platform, even though I find it hard to understand since the platform has a very aggressive cache.

Thanks in advance.