The Manjaro Calamares Installer has an annoying issue at the disk partition page. When anyone proceeds to the Partitions page, Erase Disk option is selected by default and a small popup stays for a while before completely loading the page. The same thing happens if the selected drive is changed.
As for some other distros (e.g. - EndeavourOS), in the Partitions page, no option is selected by default, so the page is quick to load.
I do not know, what’s the reason, but if it’s not an intended behaviour then, I guess, it should be changed to something like Endeavour. The rest is for the devs’ thought 
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Had the same experience with the installer in Manjaro on a good ol’ hdd.