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it seems like if you're concerned with performance, react vs ember is not the conversation you're having.

your concern would be whether to use a framework at all

Performance is a relative term. One could just as well argue that if you're really concerned with performance you should just write machine code.

i suppose i presumed a difference of 2x either way (worse/better) to justify picking one over the other -- given that frameworkless is ultimately the most optimize-able.

do you need something to be "at least X(ms) fast" or "faster than what company Y is doing" or "as fast as possible, no exceptions"

Or whether you should even be using a web app.

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