How to correctly display files via X-Accel-Redirect?

Question

PHP

There is a directory with files, for example /files/n125/, it contains the file /files/n125/image.png, it must be opened at /files/image.png. For this purpose I use X-Accel-Redirect. But now there are more than 30 images on the page, they take a very long time to load, and on some computers they do not load completely at all.
Tell me, maybe I'm using X-Accel-Redirect incorrectly?
Or maybe there is a more efficient way?