Try my course next time? ;)
That said, it’s a bit disappointing that someone whose GitHub profile wants to sell me a book about how to level up to being a senior dev (to be fair, the link is broken!) appears to have completely given up on investigating the source of a performance problem, and thrown up their hands in the face of whatever error messages they’ve seen.
LiveView isn’t perfect, but it’s not anywhere near being so bad that you can blame it for a total failure to build a working product.