The third one in your wp_head hook shouldn’t do anything, as the first one should handle that.
WordPress adds the first one by default with WP, but using dns-prefetch instead which is interesting.
Can you test without the third entry and see if it makes a difference?
If it does, I’ll try removing the dns-prefetch value WP adds and replace it with preconnect.
Thanks! Will be sweet if we can make the theme even faster 🙂