Is it possible to load header images one by one?

Hello,
on my header I have 50 images (ok, maybe they are too much, but before I started with more than 90 images... and now I had to delete the half) and I made many tests (also with seo tools). I can see that the theme start to load the 50 images ALL TOGETHER, at the same time, when somebody open for the FIRST time my blog. After the first time, everything is saved on the cache of the browser, so the navigation is faster, but the problem is the first time somebody open my site (for example, the new visitors).

Is there a way to make the load of the headrer pics one by one and not all together opening the site?

I hope the problem is clear, thanks for any help.

My website with your beautiful theme:
www.travelbaila.it

Best regards,
Pietro