After three days, I figured out that if you use wire:stream() in Livewire, the only way (that I found) to update other bits of the UI before the stream starts, is to do another wire:stream() before that. Anything that uses events gets delayed until after all the streams are complete.
So I'm using View::make('..',)->render() to pre-render a piece of the UI, and then using stream() to update that on the frontend, before the next stream() starts.
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