Checking the mirror region allows you to manually specify a specific mirror.
describe the request
This download speed is already the speed that can be achieved after configuring the appropriate region's mirror.
but in general it may be that a slower mirror is used during the installation process, and I would like to be able to manually specify the mirror server to effectively reduce the download time used.For areas where network quality is not guaranteed.
You may choose a custom mirror using the --config option and specifying a custom mirror https://archinstall.archlinux.page/installing/guided.html , but I've never tried it.
The mirror list is sorted by speed so the fastest mirrors should be placed first. As @pitastrudl pointed out you can add your own custom mirror in the UI as well