Nah, no clue. I was hoping to figure something out while playing around with my device, but having the same issue. So when first visiting Facebook, it takes about 5 seconds to load. Prior to that you’d think Block Scripts was active or something. And like you said, it doesn’t matter if Shields is on or off, it loads the same. And happens both on Nightly and on Release versions.
Yes, it takes about five seconds or so. Usually less than ten seconds. Meanwhile on other browsers, it loads instantly. You can check the video on the Reddit link I mentioned in my post for reference. It is exactly same in my case.
I have tried disabling all kinds of stuff and still ending up with this.
Yes, I don’t have this issue on my iPhone and Windows PC either.
By the way, a friend of mine is not having this issue. He didn’t setup anything in Brave either and he got a mid-range phone - POCO M2 Pro. So, doesn’t seem to be performance related. He is still on Android 11 while I tested on A13, so that could be the reason.